{"id":5238,"date":"2012-06-06T08:31:57","date_gmt":"2012-06-06T13:31:57","guid":{"rendered":"https:\/\/www.masterorganicchemistry.com\/?p=5238"},"modified":"2025-07-03T06:21:14","modified_gmt":"2025-07-03T11:21:14","slug":"nucleophilicity-vs-basicity","status":"publish","type":"post","link":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/","title":{"rendered":"Nucleophilicity vs. Basicity"},"content":{"rendered":"<p><strong>Understanding The Differences Between Nucleophilicity vs Basicity<\/strong><\/p>\n<p>Following up on <a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/06\/05\/nucleophiles-and-electrophiles\/\">Nucleophiles and Electrophiles<\/a>, here&#8217;s a common question students have about nucleophilicity:<\/p>\n<h2><strong><a id=\"one\"><\/a>1. What&#8217;s the difference between nucleophilicity and basicity?<\/strong><\/h2>\n<p>Great, great question.<\/p>\n<p>First of all, remember that basicity is a <em>subset<\/em> of nucleophilicity. All nucleophiles are Lewis bases; they donate a lone pair of electrons. A &#8220;base&#8221; (or, &#8220;Br\u00f8nsted base&#8221;) is just the name we give to a nucleophile when it&#8217;s forming a bond to a proton (H+). To summarize, when we&#8217;re talking about basicity and nucleophilicity, we&#8217;re talking about these two types of events.<\/p>\n<ul>\n<li><span style=\"text-decoration: underline;\">Basicity<\/span>: nucleophile attacks hydrogen<\/li>\n<li><span style=\"text-decoration: underline;\">Nucleophilicity<\/span>: nucleophile attacks any atom other than hydrogen. Because we&#8217;re talking about organic chemistry here, for our purposes, this is going to mean &#8220;carbon&#8221; most of the time.<\/li>\n<\/ul>\n<h2><strong><a id=\"two\"><\/a>2. Nucleophilicity vs Basicity: What Is A Base?<\/strong><\/h2>\n<p>So how do reactions of nucleophiles at hydrogen differ from reactions of nucleophiles at carbon? Well, they&#8217;re more easily reversible, for one thing. We can measure acidity (and, by extension, basicity) through the measure known as pK<sub>a<\/sub>, which is a reflection of the position of the equilibrium between an acid and its conjugate base.<\/p>\n<p>Let&#8217;s put it up in a graphic:<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-14442\" title=\" \" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif\" alt=\"difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant\" width=\"600\" height=\"349\" \/><\/p>\n<p>Because we can measure the equilibrium constants for reversible acid-base reactions, we can get a fairly good idea of the relative strengths of acids and bases. There&#8217;s some complications; solvent effects can play a role in stabilities, for instance* \u00a0but overall,<a href=\"https:\/\/www.masterorganicchemistry.com\/2010\/06\/18\/know-your-pkas\/\"> the pK<sub>a<\/sub> table is our friend<\/a>. It&#8217;s a great &#8220;reactivity ladder&#8221; to hang our hats on.<\/p>\n<p>We talked about what made species strong bases a few posts ago &#8211; it&#8217;s <a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/04\/25\/walkthrough-of-acid-base-reactions-3-acidity-trends\/\">here<\/a>. The bottom line is that the more <strong>unstable<\/strong> a lone pair of electrons is, the more <strong>basic<\/strong> it will be (and vice versa).<\/p>\n<h2><strong><a id=\"three\"><\/a>3. Nucleophilicity vs Basicity: What Is A Nucleophile?<\/strong><\/h2>\n<p>And then there&#8217;s nucleophilicity. How is nucleophilicity different from basicity? Well, since it&#8217;s not limited to simply forming a bond to hydrogen anymore, this leads to some extra complications. Let&#8217;s just talk about the measurement problem first.<\/p>\n<p>Many reactions of nucleophiles are not reversible. A bond forms, a bond breaks, and that&#8217;s the end of the reaction. The problem with this from a measurement standpoint is that we often can&#8217;t determine an equilibrium constant for a reaction. And if we can&#8217;t do that, then we can&#8217;t develop a reactivity scale based on equilibria.<\/p>\n<p>If we can&#8217;t measure equilibria, then what do we do? Well, we use\u00a0the next best measurement available: to measure reaction <strong>rates<\/strong>.<\/p>\n<p>There&#8217;s one important thing to remember with reaction rates. They don&#8217;t <em>always<\/em> reflect overall stability. There are a few more variables at play here.<\/p>\n<ul>\n<li><strong>Factor #1: Steric hindrance.<\/strong>\u00a0Reactions where nucleophiles attack carbon-based electrophiles are significantly more sensitive to steric effects, because empty orbitals on carbon are not as accessible. <a href=\"https:\/\/www.masterorganicchemistry.com\/2011\/07\/18\/steric-hindrance-is-like-a-fat-goalie\/\">Steric hindrance is like a fat goalie<\/a>.<\/li>\n<li><strong>Factor #2: Solvents<\/strong>. The medium (solvent) in which a reaction takes place can greatly affect the rate of a reaction. Specifically, the solvent can greatly attenuate (reduce) the nucleophilicity of some Lewis bases through hydrogen bonding.<\/li>\n<\/ul>\n<p>Again, let&#8217;s go to the graphic:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-14443\" title=\" \" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/2-a-nucleophile-donates-a-pair-of-electrons-to-an-atom-other-than-h-and-is-measured-by-reaction-rate-since-most-rxns-irreversible.gif\" alt=\"a-nucleophile-donates-a-pair-of-electrons-to-an-atom-other-than-h-and-is-measured-by-reaction-rate-since-most-rxns-irreversible\" width=\"600\" height=\"636\" \/><\/p>\n<p>Here&#8217;s another question that comes up. How do you know when something is going to act as a base, and when it&#8217;s going to act as a nucleophile? Another great question!<\/p>\n<p>Like the prototypical three-handed economist, I&#8217;ll tell you that it depends upon what type of reaction you&#8217;re talking about.<a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/05\/21\/acid-base-reactions-are-fast\/\"> Acid-base reactions tend to be fast<\/a>, relatively speaking. But it will greatly depend on the situation. More soon, I assure you.<\/p>\n<p><strong>Next:<\/strong> So what, specifically, makes something a good nucleophile?<\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/06\/18\/what-makes-a-good-nucleophile\/\"><strong>Next post: What Makes A Good Nucleophile?<\/strong><\/a><\/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\/2012\/06\/18\/what-makes-a-good-nucleophile\/\" class=\"\"><span>What Makes A Good Nucleophile?<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2010\/09\/22\/five-key-factors-that-influence-acidity\/\" class=\"\"><span>Five Key Factors That Influence Acidity<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/05\/21\/acid-base-reactions-are-fast\/\" class=\"\"><span>Acid Base Reactions Are Fast<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2010\/09\/29\/how-to-use-a-pka-table\/\" class=\"\"><span>How to Use a pKa Table<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2011\/07\/18\/steric-hindrance-is-like-a-fat-goalie\/\" class=\"\"><span>Steric Hindrance is Like a Fat Goalie<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/06\/05\/nucleophiles-and-electrophiles\/\" class=\"\"><span>Nucleophiles and Electrophiles<\/span><\/a><\/li><\/ul><\/div>\n<p><strong>Note 1. <\/strong>\u00a0(for more advanced readers) For instance, alcohols are dramatically less acidic in dimethyl sulfoxide [DMSO] than they are in water, and since many pK<sub>a<\/sub> values for less acidic species are given in DMSO, it&#8217;s easy to misjudge the acidity of alcohols relative to other species.<\/p>\n<hr \/>\n<h2><a id=\"quizzes\"><\/a>Quiz Yourself!<\/h2>\n\n<p class=\"p1\"><img decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3329-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\/3330-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\/3332-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\/3333-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\/3334-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\/3335-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>Understanding The Differences Between Nucleophilicity vs Basicity Following up on Nucleophiles and Electrophiles, here&#8217;s a common question students have about nucleophilicity: 1. What&#8217;s the difference <\/p>\n","protected":false},"author":1,"featured_media":14442,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1410],"tags":[164,176,177,200,836,243,244,834,835],"post_folder":[],"class_list":["post-5238","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-organic-reaction-primer","tag-acids","tag-bases","tag-basicity","tag-electrophiles","tag-kinetic","tag-nucleophiles","tag-nucleophilicity","tag-rates","tag-thermodynamic"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nucleophilicity vs. Basicity &#8211; Master Organic Chemistry<\/title>\n<meta name=\"description\" content=\"What is the difference between basicity and nucleophilicity? Basicity measures a reversible equilibrium, whereas nucleophilicity measures a rate.\" \/>\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\/2012\/06\/06\/nucleophilicity-vs-basicity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nucleophilicity vs. Basicity &#8211; Master Organic Chemistry\" \/>\n<meta property=\"og:description\" content=\"What is the difference between basicity and nucleophilicity? Basicity measures a reversible equilibrium, whereas nucleophilicity measures a rate.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/\" \/>\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=\"2012-06-06T13:31:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-03T11:21:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif\" \/>\n\t<meta property=\"og:image:width\" content=\"874\" \/>\n\t<meta property=\"og:image:height\" content=\"508\" \/>\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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/\"},\"author\":{\"name\":\"James Ashenhurst\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#\\\/schema\\\/person\\\/78d83ec7d02b4b7365bade2cedaef80c\"},\"headline\":\"Nucleophilicity vs. Basicity\",\"datePublished\":\"2012-06-06T13:31:57+00:00\",\"dateModified\":\"2025-07-03T11:21:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/\"},\"wordCount\":832,\"commentCount\":60,\"publisher\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2019\\\/12\\\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif\",\"keywords\":[\"acids\",\"bases\",\"basicity\",\"electrophiles\",\"kinetic\",\"nucleophiles\",\"nucleophilicity\",\"rates\",\"thermodynamic\"],\"articleSection\":[\"A Primer On Organic Reactions\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/\",\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/\",\"name\":\"Nucleophilicity vs. Basicity &#8211; Master Organic Chemistry\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2019\\\/12\\\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif\",\"datePublished\":\"2012-06-06T13:31:57+00:00\",\"dateModified\":\"2025-07-03T11:21:14+00:00\",\"description\":\"What is the difference between basicity and nucleophilicity? Basicity measures a reversible equilibrium, whereas nucleophilicity measures a rate.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2019\\\/12\\\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif\",\"contentUrl\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/wp-content\\\/uploads\\\/2019\\\/12\\\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif\",\"width\":874,\"height\":508},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/2012\\\/06\\\/06\\\/nucleophilicity-vs-basicity\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.masterorganicchemistry.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Nucleophilicity vs. Basicity\"}]},{\"@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":"Nucleophilicity vs. Basicity &#8211; Master Organic Chemistry","description":"What is the difference between basicity and nucleophilicity? Basicity measures a reversible equilibrium, whereas nucleophilicity measures a rate.","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\/2012\/06\/06\/nucleophilicity-vs-basicity\/","og_locale":"en_US","og_type":"article","og_title":"Nucleophilicity vs. Basicity &#8211; Master Organic Chemistry","og_description":"What is the difference between basicity and nucleophilicity? Basicity measures a reversible equilibrium, whereas nucleophilicity measures a rate.","og_url":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/","og_site_name":"Master Organic Chemistry","article_publisher":"https:\/\/www.facebook.com\/Master-Organic-Chemistry-242610599108055\/","article_published_time":"2012-06-06T13:31:57+00:00","article_modified_time":"2025-07-03T11:21:14+00:00","og_image":[{"width":874,"height":508,"url":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif","type":"image\/gif"}],"author":"James Ashenhurst","twitter_card":"summary_large_image","twitter_misc":{"Written by":"James Ashenhurst","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#article","isPartOf":{"@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/"},"author":{"name":"James Ashenhurst","@id":"https:\/\/www.masterorganicchemistry.com\/#\/schema\/person\/78d83ec7d02b4b7365bade2cedaef80c"},"headline":"Nucleophilicity vs. Basicity","datePublished":"2012-06-06T13:31:57+00:00","dateModified":"2025-07-03T11:21:14+00:00","mainEntityOfPage":{"@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/"},"wordCount":832,"commentCount":60,"publisher":{"@id":"https:\/\/www.masterorganicchemistry.com\/#organization"},"image":{"@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#primaryimage"},"thumbnailUrl":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif","keywords":["acids","bases","basicity","electrophiles","kinetic","nucleophiles","nucleophilicity","rates","thermodynamic"],"articleSection":["A Primer On Organic Reactions"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/","url":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/","name":"Nucleophilicity vs. Basicity &#8211; Master Organic Chemistry","isPartOf":{"@id":"https:\/\/www.masterorganicchemistry.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#primaryimage"},"image":{"@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#primaryimage"},"thumbnailUrl":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif","datePublished":"2012-06-06T13:31:57+00:00","dateModified":"2025-07-03T11:21:14+00:00","description":"What is the difference between basicity and nucleophilicity? Basicity measures a reversible equilibrium, whereas nucleophilicity measures a rate.","breadcrumb":{"@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#primaryimage","url":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif","contentUrl":"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-difference-between-basicity-and-nucleophilicity-a-base-donates-a-pair-of-electrons-to-a-proton-and-is-measured-by-equilibrium-constant.gif","width":874,"height":508},{"@type":"BreadcrumbList","@id":"https:\/\/www.masterorganicchemistry.com\/2012\/06\/06\/nucleophilicity-vs-basicity\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.masterorganicchemistry.com\/"},{"@type":"ListItem","position":2,"name":"Nucleophilicity vs. Basicity"}]},{"@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\/5238","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=5238"}],"version-history":[{"count":0,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/posts\/5238\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/media\/14442"}],"wp:attachment":[{"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/media?parent=5238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/categories?post=5238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/tags?post=5238"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/www.masterorganicchemistry.com\/wp-json\/wp\/v2\/post_folder?post=5238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}