{"id":23937,"date":"2022-02-08T14:11:12","date_gmt":"2022-02-08T20:11:12","guid":{"rendered":"https:\/\/www.masterorganicchemistry.com\/?p=23937"},"modified":"2025-03-04T14:44:48","modified_gmt":"2025-03-04T20:44:48","slug":"1h-nmr-how-many-signals","status":"publish","type":"post","link":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/","title":{"rendered":"1H NMR: How Many Signals?"},"content":{"rendered":"<p><strong>How Many Unique 1H NMR Signals In A Molecule?\u00a0<\/strong><\/p>\n<p>How many signals will appear in the proton (1H)NMR spectrum of a molecule? If the answer were as straightforward as just counting the number of protons, then we wouldn&#8217;t bother asking the question, now, would we?<\/p>\n<p>The purpose of this post is to help you figure out the answer to these types of questions. The plan is to start with the most absurdly simple examples and then slowly work our way up to more complicated ones. We will see that protons will have equivalent 1H NMR signals\u00a0 (<strong>chemically shift equivalent<\/strong>) if they can be superimposed on each other through three<\/p>\n<ul>\n<li>reflection through a mirror plane in the molecule<\/li>\n<li>rotation of the molecule itself [inversion center]<\/li>\n<li>fast bond rotation (which has the effect of &#8220;blurring&#8221; the signals together, averaging them out)<\/li>\n<\/ul>\n<h2>Table of Contents<\/h2>\n<ol>\n<li><a href=\"#two\">Bromoacetylene and Acetylene<\/a><\/li>\n<li><a href=\"#three\">Chemical Shift Equivalence<\/a><\/li>\n<li><a href=\"#four\">Ethene<\/a><\/li>\n<li><a href=\"#five\">Methane<\/a><\/li>\n<li><a href=\"#six\">Benzene<\/a><\/li>\n<li><a href=\"#seven\">Identifying Planes of Symmetry<\/a><\/li>\n<li><a href=\"#eight\">Disubstituted Benzene<\/a><\/li>\n<li><a href=\"#nine\">Chloroethylene<\/a><\/li>\n<li><a href=\"#ten\">Chemical Shift Equivalence Through Bond Rotation<\/a><\/li>\n<li><a href=\"#eleven\">More Examples<\/a><\/li>\n<li><a href=\"#notes\">Notes<\/a><\/li>\n<li><a href=\"#quizzes\">Quiz Yourself!<\/a><\/li>\n<\/ol>\n<hr \/>\n<h2><strong><a id=\"two\"><\/a>1. Bromoacetylene and Acetylene<\/strong><\/h2>\n<p>Bromoacetylene is about the simplest possible example of a molecule that has one proton, and therefore exactly <strong>one peak<\/strong> in a 1H NMR spectrum <em>(with a chemical shift of 2.33 in CCl4 [<a href=\"https:\/\/sdbs.db.aist.go.jp\/sdbs\/cgi-bin\/direct_frame_top.cgi\">ref<\/a>]).\u00a0<\/em><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-24193\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif\" alt=\"protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence\" width=\"599\" height=\"181\" \/><\/a><\/p>\n<p>Acetylene itself (C<sub>2<\/sub>H<sub>2<\/sub>) has two protons. Does that mean it has two signals?<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-24194\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/2-equivalent-protons-of-acetylene-chemical-shift-equivalence.gif\" alt=\"equivalent-protons-of-acetylene-chemical-shift-equivalence\" width=\"600\" height=\"662\" \/><\/a><\/p>\n<p>No. Despite doubling the number of protons, the correct answer is still ONE signal.<\/p>\n<p>Why is that?<\/p>\n<h2><strong><a id=\"three\"><\/a>2. Chemical Shift Equivalence<\/strong><\/h2>\n<p>Recall that the &#8220;chemical shift&#8221; of a proton NMR signal represents the shielding of a hydrogen nucleus by its surrounding electrons.<\/p>\n<p>The two protons in acetylene are in identical electronic environments. Note that we can flip acetylene 180 degrees, or rotate it along its axis, and the two protons are completely indistinguishable. This means that the two protons will have the exact same chemical shift. [Note\u00a0 &#8211; it will integrate to two] .<\/p>\n<p>We call this\u00a0<strong>chemical shift equivalence.\u00a0<\/strong><\/p>\n<p class=\"p2\"><span class=\"s1\">When two or more protons are chemically equivalent, they will contribute to the production of a single signal at one specific chemical shift in a 1H NMR spectrum. For example, if three hydrogens on a molecule are chemically equivalent, instead of producing three different signals in the spectrum, only one signal will be produced to represent all three. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">This chemical shift equivalence is a result of the hydrogens\u2019 nuclei being interchangeable through operations of symmetry (planes of symmetry) or rapid intramolecular processes (bond rotation or tautomerization). <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Hydrogens with this equivalence may be either homotopic (identical) or enantiotopic (equivalent in achiral solvents).<\/span><\/p>\n<p class=\"p2\">[The number of peaks we observe in an NMR spectrum will correspond to the number of protons that are in <em>different<\/em> environments. ]<\/p>\n<h2><strong><a id=\"four\"><\/a>3. Ethene<\/strong><\/h2>\n<p class=\"p2\"><span class=\"s1\">Let\u2019s expand this further with the simplest possible alkene, ethene (a.k.a. &#8220;ethylene&#8221;).\u00a0 Ethylene contains four hydrogens. How many signals would we observe?\u00a0<\/span><\/p>\n<p class=\"p4\"><img decoding=\"async\" class=\"alignnone wp-image-24195\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/3-equivalence-of-ethene-protons-chemical-shift.gif\" alt=\"-equivalence-of-ethene-protons-chemical-shif\" width=\"600\" height=\"778\" \/><\/a><\/p>\n<p>The answer remains &#8220;one&#8221;.\u00a0 Four protons, but just one peak in the 1H NMR spectrum.<\/p>\n<p class=\"p2\"><span class=\"s1\">Taking a look at ethylene, we can see two apparent planes of symmetry that cut the molecule vertically and horizontally in half. Performing symmetry operations along these axes confirm that its four hydrogens are interchangeable. The four nuclei reside in identical intramolecular environments, making them chemically equivalent. Thus, the performance of a 1H NMR experiment will produce only one signal in the spectrum to represent all four hydrogens at a single chemical shift. [NMR spectrum here].\u00a0<\/span><\/p>\n<h2><strong><a id=\"five\"><\/a>4. Methane<\/strong><\/h2>\n<p class=\"p2\"><span class=\"s1\">So far we have looked at an alkyne and alkene. Now, let\u2019s take a look at an alkane like methane.<\/span><\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24196\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/4-equivalence-of-methane-protons-chemical-shift-equivalence.gif\" alt=\"equivalence-of-methane-protons-chemical-shift-equivalence\" width=\"600\" height=\"822\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">Methane is a highly symmetrical molecule that contains many planes of symmetry\u201313 to be exact. By performing just a few of these symmetry operations, such as rotating about the four rotational axes shown above, we can see that all four of methane\u2019s hydrogens are interchangeable. The four equivalent protons will produce one signal at a single chemical shift on the spectrum.<\/span><\/p>\n<h2><strong><a id=\"six\"><\/a>5. Benzene<\/strong><\/h2>\n<p>How about benzene? Six protons. How many signals?<\/p>\n<p class=\"p2\">One!<\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24197\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/5-equivalence-of-benzene-protons-chemical-shift-equivalence.gif\" alt=\"equivalence-of-benzene-protons-chemical-shift-equivalence\" width=\"600\" height=\"1292\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">Benzene is another compound that contains many planes of symmetry. Through mirror planes and multiple rotational operations, all six of benzene\u2019s hydrogens are found to be homotopic. These, too, will produce only one signal in a 1H NMR spectrum.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Let\u2019s apply and expand a bit. Based on what we have learned so far, how many signals would each molecule below produce?<\/span><\/p>\n<h2><strong><a id=\"seven\"><\/a>6. Identifying Planes of Symmetry<\/strong><\/h2>\n<p>Look for planes of symmetry.<\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24198\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/6-quiz-chemical-shift-equivalence.gif\" alt=\"quiz-chemical-shift-equivalence\" width=\"600\" height=\"553\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">They each produce 1! This can be confirmed just by looking at the basic mirror planes represented in each of the molecules. Further confirmation is possible by performing more symmetry operations along their rotational axes.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">How about a few more complex examples?\u00a0<\/span><\/p>\n<h2><strong><a id=\"eight\"><\/a>7. Disubstituted Benzenes<\/strong><\/h2>\n<p>There are three isomers of dichlorobenzene. Ortho-dichlorobenzene, meta dichlorobenzene, and para dichlorobenzene. How many peaks in each?<\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24199\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/7-quiz-chemical-shift-equivalence-answer.gif\" alt=\"quiz-chemical-shift-equivalence-answer.\" width=\"600\" height=\"512\" \/><\/a><\/p>\n<p>[Missing Para]<\/p>\n<p class=\"p2\"><span class=\"s1\">These molecules do, in fact, contain mirror planes and rotational axes. However, containing a plane of symmetry does not automatically deem all hydrogens equivalent. Hydrogens may still be unique despite containing symmetry depending on their neighboring atoms.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Some substitution patterns result in planes of symmetry, some do not.<\/span><\/p>\n<h2><strong><a id=\"nine\"><\/a>8. Chloroethylene<\/strong><\/h2>\n<p class=\"p2\"><span class=\"s1\">Now, how about chloroethylene?<\/span><\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24200\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/8-how-many-signals-chloroethene.gif\" alt=\"how-many-signals-chloroethene\" width=\"600\" height=\"337\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">Chloroethylene is not a very symmetrical molecule. It lacks a plane of symmetry that would make any of its hydrogens interchangeable. Each of its protons is in a unique environment and will produce its own signal in a 1H NMR spectrum. Not all alkene hydrogens will always be identical.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Let\u2019s take a look at some more alkanes.<\/span><\/p>\n<h2><a id=\"ten\"><\/a>9. Chemical Shift Equivalence Through Bond Rotation<\/h2>\n<p class=\"p2\"><span class=\"s1\">We saw that methane produced one signal because of its rotational symmetry. How about ethane?<\/span><\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24201\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/9-ethane-how-many-signals-chemical-shift-equivalence.gif\" alt=\"ethane-how-many-signals-chemical-shift-equivalence\" width=\"600\" height=\"205\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">We can can see that through ethane\u2019s mirror plane that its hydrogens are equivalent, but this is just a function of the way I&#8217;ve drawn it here. , but recall that there is rotation about the C\u2013C bond of the molecule.<span class=\"Apple-converted-space\">\u00a0 <\/span>Do ethane\u2019s conformations affect the number of signals produced in its 1H NMR spectrum?<\/span><\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24202\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/10-equivalence-of-protons-in-ethane.gif\" alt=\"-equivalence-of-protons-in-ethane\" width=\"600\" height=\"180\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">The answer is no! While the spinning of the methyl groups does occur in ethane, the speed of rotation is fast enough relative to the NMR \u201cshutter speed\u201d that the hydrogens become equivalent and blur together like the spinning of a bicycle wheel or blades of a fan. The signal produced is composed of the average of the hydrogens in different conformers. For ethane\u2019s case its conformers can be ignored for 1H NMR purposes here. Only one signal will be produced in its spectrum.<\/span><\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24203\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/11-effect-of-conformations-on-number-of-signals-in-ethane.gif\" alt=\"effect-of-conformations-on-number-of-signals-in-ethane\" width=\"600\" height=\"560\" \/><\/a><\/p>\n<p><span class=\"s1\">This equivalence through rapid bond rotation applies to other alkanes, as well.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24204\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/12-table-of-hydrocarbons-number-of-signals.gif\" alt=\"table-of-hydrocarbons-number-of-signals\" width=\"600\" height=\"689\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">As we can see in the table above, basic alkane chains contain planes of symmetry that bisect the molecules straight down the middle. Both this symmetry and rapid bond rotations contribute to the equivalence of alkyl hydrogens. The number of signals these molecule\u2019s produce in a 1H NMR spectrum can be determined just by counting the number of distinct hydrogens on one side of the plane of symmetry.<\/span><\/p>\n<h2><strong><a id=\"eleven\"><\/a>10. Some More Examples<\/strong><\/h2>\n<p class=\"p2\"><span class=\"s1\">Applying the information we have learned, let\u2019s try a few examples.<\/span><\/p>\n<p class=\"p4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24205\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/13-quiz-for-number-of-signals-in-various-molecules.gif\" alt=\"quiz-for-number-of-signals-in-various-molecule\" width=\"600\" height=\"659\" \/><\/a><\/p>\n<p class=\"p2\"><span class=\"s1\">We can see that even though these molecules have an abundance of protons, their symmetry greatly reduces the number of signals a 1H NMR experiment would produce. Using operations of symmetry to find proton equivalence can be greatly simplifying!<\/span><\/p>\n<hr \/>\n<h2><a id=\"notes\"><\/a>Notes<\/h2>\n<div class=\"related-articles\"><p><strong>Related Articles<\/strong><\/p><ul><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/diastereotopic-protons-1h-nmr-examples\/\" class=\"\"><span>Diastereotopic Protons in 1H NMR Spectroscopy: Examples<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/04\/17\/homotopic-enantiotopic-diastereotopic\/\" class=\"\"><span>Homotopic, Enantiotopic, Diastereotopic<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/c13-nmr-how-many-signals\/\" class=\"\"><span>C13 NMR \u2013 How Many Signals<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2016\/08\/23\/structure-determination-case-study-deer-tarsal-gland-pheremone\/\" class=\"\"><span>Structure Determination Case Study: Deer Tarsal Gland Pheromone<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2016\/11\/23\/quick_analysis_of_ir_spectra\/\" class=\"\"><span>Infrared Spectroscopy: A Quick Primer On Interpreting Spectra<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2016\/11\/29\/ir-spectroscopy-some-simple-practice-problems\/\" class=\"\"><span>IR Spectroscopy: 4 Practice Problems<\/span><\/a><\/li><\/ul><\/div>\n<hr \/>\n<h2><a id=\"quizzes\"><\/a>Quiz Yourself!<\/h2>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3120-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3121-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <br \/>\n<\/p>\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3122-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <br \/>\n<\/p>\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3123-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <br \/>\n<\/p>\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3124-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>How Many Unique 1H NMR Signals In A Molecule?\u00a0 How many signals will appear in the proton (1H)NMR spectrum of a molecule? If the answer <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[386],"tags":[14732,306,14733,14734,308],"post_folder":[],"class_list":["post-23937","post","type-post","status-publish","format-standard","hentry","category-spectroscopy-2","tag-chemical-shift-equivalence","tag-nmr","tag-proton-nmr","tag-signals","tag-spectroscopy"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>1H NMR: How Many Signals? &#8211; Master Organic Chemistry<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1H NMR: How Many Signals? &#8211; Master Organic Chemistry\" \/>\n<meta property=\"og:description\" content=\"How Many Unique 1H NMR Signals In A Molecule?\u00a0 How many signals will appear in the proton (1H)NMR spectrum of a molecule? If the answer\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/\" \/>\n<meta property=\"og:site_name\" content=\"Master Organic Chemistry\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Master-Organic-Chemistry-242610599108055\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-02-08T20:11:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-04T20:44:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif\" \/>\n\t<meta property=\"og:image:width\" content=\"874\" \/>\n\t<meta property=\"og:image:height\" content=\"264\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/gif\" \/>\n<meta name=\"author\" content=\"James Ashenhurst\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"James Ashenhurst\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/\"},\"author\":{\"name\":\"James Ashenhurst\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#\\\/schema\\\/person\\\/78d83ec7d02b4b7365bade2cedaef80c\"},\"headline\":\"1H NMR: How Many Signals?\",\"datePublished\":\"2022-02-08T20:11:12+00:00\",\"dateModified\":\"2025-03-04T20:44:48+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/\"},\"wordCount\":1334,\"commentCount\":9,\"publisher\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif\",\"keywords\":[\"chemical shift equivalence\",\"NMR\",\"proton nmr\",\"signals\",\"spectroscopy\"],\"articleSection\":[\"Spectroscopy\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/\",\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/\",\"name\":\"1H NMR: How Many Signals? &#8211; Master Organic Chemistry\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif\",\"datePublished\":\"2022-02-08T20:11:12+00:00\",\"dateModified\":\"2025-03-04T20:44:48+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif\",\"contentUrl\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif\",\"width\":874,\"height\":264,\"caption\":\"protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2022\\\/02\\\/08\\\/1h-nmr-how-many-signals\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"1H NMR: How Many Signals?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#website\",\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/\",\"name\":\"Master Organic Chemistry\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#organization\",\"name\":\"Master Organic Chemistry\",\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/cutmypic.png\",\"contentUrl\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/cutmypic.png\",\"width\":225,\"height\":225,\"caption\":\"Master Organic Chemistry\"},\"image\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/Master-Organic-Chemistry-242610599108055\\\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#\\\/schema\\\/person\\\/78d83ec7d02b4b7365bade2cedaef80c\",\"name\":\"James Ashenhurst\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f9e9df435875e5e6b0bdff6b8522a7279d5717644b3efa7299da22c837bf9fcf?s=96&d=retro&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f9e9df435875e5e6b0bdff6b8522a7279d5717644b3efa7299da22c837bf9fcf?s=96&d=retro&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f9e9df435875e5e6b0bdff6b8522a7279d5717644b3efa7299da22c837bf9fcf?s=96&d=retro&r=g\",\"caption\":\"James Ashenhurst\"},\"description\":\"Ph.D. 2006, McGill University (James L. Gleason). Postdoctoral Associate, 2008-2010, Massachusetts Institute of Technology (M. Movassaghi). Founder, Master Organic Chemistry, 2010-present.\",\"sameAs\":[\"https:\\\/\\\/www.masterorganicchemistry.com\\\/about\\\/\"],\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/author\\\/james\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"1H NMR: How Many Signals? &#8211; Master Organic Chemistry","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/","og_locale":"en_US","og_type":"article","og_title":"1H NMR: How Many Signals? &#8211; Master Organic Chemistry","og_description":"How Many Unique 1H NMR Signals In A Molecule?\u00a0 How many signals will appear in the proton (1H)NMR spectrum of a molecule? If the answer","og_url":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/","og_site_name":"Master Organic Chemistry","article_publisher":"https:\/\/www.facebook.com\/Master-Organic-Chemistry-242610599108055\/","article_published_time":"2022-02-08T20:11:12+00:00","article_modified_time":"2025-03-04T20:44:48+00:00","og_image":[{"width":874,"height":264,"url":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif","type":"image\/gif"}],"author":"James Ashenhurst","twitter_card":"summary_large_image","twitter_misc":{"Written by":"James Ashenhurst","Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#article","isPartOf":{"@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/"},"author":{"name":"James Ashenhurst","@id":"https:\/\/www.masterorganicchemistry.com\/#\/schema\/person\/78d83ec7d02b4b7365bade2cedaef80c"},"headline":"1H NMR: How Many Signals?","datePublished":"2022-02-08T20:11:12+00:00","dateModified":"2025-03-04T20:44:48+00:00","mainEntityOfPage":{"@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/"},"wordCount":1334,"commentCount":9,"publisher":{"@id":"https:\/\/www.masterorganicchemistry.com\/#organization"},"image":{"@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#primaryimage"},"thumbnailUrl":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif","keywords":["chemical shift equivalence","NMR","proton nmr","signals","spectroscopy"],"articleSection":["Spectroscopy"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/","url":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/","name":"1H NMR: How Many Signals? &#8211; Master Organic Chemistry","isPartOf":{"@id":"https:\/\/www.masterorganicchemistry.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#primaryimage"},"image":{"@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#primaryimage"},"thumbnailUrl":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif","datePublished":"2022-02-08T20:11:12+00:00","dateModified":"2025-03-04T20:44:48+00:00","breadcrumb":{"@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#primaryimage","url":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif","contentUrl":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2021\/06\/1-protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence.gif","width":874,"height":264,"caption":"protons-of-bromoacetylene-and-acetylene-chemical-shift-equivalence"},{"@type":"BreadcrumbList","@id":"https:\/\/www.masterorganicchemistry.com\/2022\/02\/08\/1h-nmr-how-many-signals\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.masterorganicchemistry.com\/"},{"@type":"ListItem","position":2,"name":"1H NMR: How Many Signals?"}]},{"@type":"WebSite","@id":"https:\/\/www.masterorganicchemistry.com\/#website","url":"https:\/\/www.masterorganicchemistry.com\/","name":"Master Organic Chemistry","description":"","publisher":{"@id":"https:\/\/www.masterorganicchemistry.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.masterorganicchemistry.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.masterorganicchemistry.com\/#organization","name":"Master Organic Chemistry","url":"https:\/\/www.masterorganicchemistry.com\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.masterorganicchemistry.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/04\/cutmypic.png","contentUrl":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/04\/cutmypic.png","width":225,"height":225,"caption":"Master Organic Chemistry"},"image":{"@id":"https:\/\/www.masterorganicchemistry.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/Master-Organic-Chemistry-242610599108055\/"]},{"@type":"Person","@id":"https:\/\/www.masterorganicchemistry.com\/#\/schema\/person\/78d83ec7d02b4b7365bade2cedaef80c","name":"James Ashenhurst","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/f9e9df435875e5e6b0bdff6b8522a7279d5717644b3efa7299da22c837bf9fcf?s=96&d=retro&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/f9e9df435875e5e6b0bdff6b8522a7279d5717644b3efa7299da22c837bf9fcf?s=96&d=retro&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/f9e9df435875e5e6b0bdff6b8522a7279d5717644b3efa7299da22c837bf9fcf?s=96&d=retro&r=g","caption":"James Ashenhurst"},"description":"Ph.D. 2006, McGill University (James L. Gleason). Postdoctoral Associate, 2008-2010, Massachusetts Institute of Technology (M. Movassaghi). Founder, Master Organic Chemistry, 2010-present.","sameAs":["https:\/\/www.masterorganicchemistry.com\/about\/"],"url":"https:\/\/www.masterorganicchemistry.com\/author\/james\/"}]}},"_links":{"self":[{"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/posts\/23937","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/comments?post=23937"}],"version-history":[{"count":0,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/posts\/23937\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/media?parent=23937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/categories?post=23937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/tags?post=23937"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/post_folder?post=23937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}