{"id":1278,"date":"2011-01-19T20:30:28","date_gmt":"2011-01-20T01:30:28","guid":{"rendered":"https:\/\/www.masterorganicchemistry.com\/?p=1278"},"modified":"2022-11-01T12:44:21","modified_gmt":"2022-11-01T17:44:21","slug":"what-to-expect-in-organic-chemistry-2","status":"publish","type":"post","link":"https:\/\/www.masterorganicchemistry.com\/2011\/01\/19\/what-to-expect-in-organic-chemistry-2\/","title":{"rendered":"What To Expect In Organic Chemistry 2"},"content":{"rendered":"<p><strong>Organic Chemistry 2 Is Largely About &#8220;Resonance&#8221;<\/strong><\/p>\n<p>A large part of organic chemistry 1 is devoted to laying the foundations: introducing structural concepts such as bonding, geometry, stereochemistry, conformations, resonance, and steric effects, while introducing concepts in chemical reactivity such as nucleophilicity, electrophilicity, acidity, basicity and so on.<\/p>\n<p>While there are several important new concepts introduced in Org 2 (especially in the context of pi-bonding) you will find that it largely builds on the foundations of Org 1 and assumes that you fully understand these concepts. The focus in Org 2 will be much more on reactions.<\/p>\n<p>If I had to name an overall theme for Org 2, it would be : &#8220;the chemistry of pi bonds.&#8221; <strong>Understanding resonance will be very important!<\/strong><\/p>\n<p>Here is a brief introduction to some of the highlights of\u00a0 Org 2.\u00a0 By the end of the course, the answers to the following questions hopefully won&#8217;t seem as mysterious.<\/p>\n<p><strong>Table of Contents<\/strong><\/p>\n<ol>\n<li class=\"p1\"><a href=\"#one\"><span class=\"s1\"><span class=\"s1\">Conjugation, And Why It Matters<\/span><\/span><\/a><\/li>\n<li class=\"p1\"><a href=\"#two\">Thermodynamic And Kinetic Control<\/a><\/li>\n<li class=\"p1\"><a href=\"#three\">Cycloaddition Reactions<\/a><\/li>\n<li class=\"p1\"><a href=\"#four\"><span class=\"s1\">Aromaticity<\/span><\/a><\/li>\n<li class=\"p1\"><a href=\"#five\"><span class=\"s1\"><span class=\"s1\">Carbonyl Chemistry<\/span><\/span><\/a><\/li>\n<li class=\"p1\"><a href=\"#six\">Biomolecules<\/a><\/li>\n<li class=\"p1\"><a href=\"#seven\">Summary: What To Expect In Organic Chemistry 2<\/a><\/li>\n<\/ol>\n<hr \/>\n<h2><strong><a id=\"one\"><\/a>1. Conjugation, And Why It Matters<\/strong><\/h2>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-15533\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-questions-that-come-up-in-organic-chemistry-2-conjugation-enamine-reactions-aldehydes-ketones.gif\" alt=\"questions that come up in organic chemistry 2 conjugation enamine reactions aldehydes ketones\" width=\"600\" height=\"618\" \/><\/p>\n<p>Why is it that diene <strong>A<\/strong> is more stable than diene <strong>B? <\/strong> How is it that replacing a single substituent on an alkene can drastically affect the reactivity? For example, why is it that alkene <strong>C<\/strong> does not react with electrophiles such as alkyl halides, but alkene<br \/>\n<strong>D<\/strong> does. And alkene <strong>E<\/strong> does not react with nucleophiles, but alkene <strong>F<\/strong> does. How do we explain this?<\/p>\n<h2><strong><a id=\"two\"><\/a>2. Thermodynamic And Kinetic Control<\/strong><\/h2>\n<p><img decoding=\"async\" class=\"alignnone wp-image-15534\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/2-question-about-thermodynamic-versus-kinetic-control-in-the-addition-of-hbr-to-butadiene.gif\" alt=\"question about thermodynamic versus kinetic control in the addition of hbr to butadiene\" width=\"600\" height=\"245\" \/><\/p>\n<p>In the addition of HBr to an isolated alkene such as, say, 1-butene, there is only one product possible (not counting stereoisomers). However, if we add HBr to butadiene, we can get two products, <strong>A<\/strong> and <strong>B<\/strong>. At low temperature, we obtain <strong>A<\/strong> as the dominant product, but at high temperature, <strong>B<\/strong> is dominant. Why is this?<\/p>\n<h2><strong><a id=\"three\"><\/a>3. Cycloaddition Reactions<\/strong><\/h2>\n<p><img decoding=\"async\" class=\"alignnone wp-image-15535\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/3-what-to-expect-in-org-2-diels-alder-reaction-selection-ruules-only-diels-alder-works-not-2-plus-2.gif\" alt=\"what to expect in org 2 diels alder reaction selection ruules only diels alder works not 2 plus 2\" width=\"600\" height=\"401\" \/><\/p>\n<p>When the diene (cyclopentadiene) is added to ethene, no reaction occurs. But when we use the middle alkene instead, there is a rapid reaction to provide a new cyclic compound. What is different about this alkene that allows this reaction to occur? And why will this alkene react readily with cyclopentadiene, but when it is added to ethene, nothing happens?<\/p>\n<h2><strong><a id=\"four\"><\/a>4. Aromaticity<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-15536\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/4-what-to-expect-in-org-2-why-is-bromination-of-alkenes-give-addition-but-bromination-of-benzene-gives-substitution.gif\" alt=\"what to expect in org 2 why is bromination of alkenes give addition but bromination of benzene gives substitution\" width=\"600\" height=\"396\" \/><\/p>\n<p>Normal alkenes (like cyclohexene) give trans dibromides when treated with Br2. But the cyclic triene in the middle (benzene) doesn&#8217;t react with bromine at all (unless you add a catalyst, and even then you get a different product!) \u00a0Why the difference in reactivity? And why is this behavior similar for molecules like <a href=\"http:\/\/en.wikipedia.org\/wiki\/Furan\">furan<\/a>, <a href=\"http:\/\/en.wikipedia.org\/wiki\/Pyrrole\">pyrrole<\/a>, and <a href=\"http:\/\/en.wikipedia.org\/wiki\/Pyridine\">pyridine<\/a>, \u00a0but a molecule like <a href=\"http:\/\/en.wikipedia.org\/wiki\/Cyclooctatetraene\">cyclooctatetraene<\/a> (bottom) will also add Br2?<\/p>\n<h2><strong><a id=\"five\"><\/a>5. Carbonyl Chemistry<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-15537\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/5-what-to-expect-in-org-2-why-do-grignards-react-with-ketones-but-not-esters.gif\" alt=\"what to expect in org 2 why do grignards react with ketones but not esters\" width=\"600\" height=\"270\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-15538\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/6-what-to-expect-in-org-2-why-do-carboxylic-acids-not-react-with-alcohols-unless-acid-is-added.gif\" alt=\"what to expect in org 2 why do carboxylic acids not react with alcohols unless acid is added\" width=\"600\" height=\"229\" \/><\/p>\n<p>Grignard reagents react readily with aldehydes and ketones, but not amides. What causes the difference in reactivity?<\/p>\n<p>When an alcohol is added to a carboxylic acid, the flask has less mojo than a\u00a0<a href=\"http:\/\/en.wikipedia.org\/wiki\/Shakers\">Shaker<\/a> meetinghouse. But when just a drop of acid is added, they readily combine to form an ester. Why is this?<\/p>\n<h2><strong><a id=\"six\"><\/a>6. Biomolecules<\/strong><\/h2>\n<p>Your body is made up of proteins, sugars, and fats. What do these molecules look like? What are their properties? How can we make them in the laboratory, and potentially modify their structures?<\/p>\n<h2><strong><a id=\"seven\"><\/a>7. Summary: What To Expect In Organic Chemistry 2<\/strong><\/h2>\n<p><span style=\"text-decoration: underline;\">It&#8217;s vitally important to<\/span>: make sure you have a firm handle on the key concepts and reactions from organic 1, because it will be assumed that you know it all.<\/p>\n<p><span style=\"text-decoration: underline;\">The biggest challenge will be<\/span>: getting a handle on the large number of reactions to learn, especially in carbonyl chemistry.<\/p>\n<p><span style=\"text-decoration: underline;\">It will make your life easier if<\/span>&#8230; you look for underlying trends and themes and see that\u00a0 underneath what appears to be tremendous variety, there are really only a handful of mechanisms.<\/p>\n<p><span style=\"text-decoration: underline;\">The most important skill the course will provide<\/span>: being able to design and plan multiple-step syntheses of relatively complicated molecules. Furthermore, the course will give you a much greater understanding of the chemistry of biologically important molecules such as amino acids, lipids, and sugars. It will be a lot of work, but you&#8217;ll see the world around you in a different way.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-15539\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2019\/12\/1-concept-map-of-organic-chemistry-2-different-concepts-arranged-by-order-of-introduction-resonance-aromaticity-dienes-thermodynamics.gif\" alt=\"concept map of organic chemistry 2 different concepts arranged by order of introduction resonance aromaticity dienes thermodynamics\" width=\"630\" height=\"481\" \/><\/p>\n<p><strong>Edit &#8211; fixed some typos. <\/strong>Thanks to Prasanna for pointing them out.<\/p>\n<p>P.S. Where does \u201cOrg 2\u201d end and \u201cOrg 3\u201d begin? I\u2019d say it\u2019s when we start having to deal with <i>multiple functional groups in the same molecule that can potentially react. <\/i>From Org 3 onwards, we really start to focus on the issue of \u201cselectivity\u201d : selectivity between functional groups (\u201cchemoselectivity\u201d), selectivity for synthesis of various stereoisomers (\u201cstereoselective synthesis\u201d), and designing the synthesis of ever more complex molecules from an ever-growing arsenal of reactions.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Organic Chemistry 2 Is Largely About &#8220;Resonance&#8221; A large part of organic chemistry 1 is devoted to laying the foundations: introducing structural concepts such as <\/p>\n","protected":false},"author":1,"featured_media":15533,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1163],"tags":[320,195,639,631,248,267,638],"post_folder":[],"class_list":["post-1278","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dienes-and-mo-theory","tag-aromaticity","tag-conjugation","tag-cycloaddition","tag-diels-alder","tag-org-2-2","tag-resonance","tag-thermodynamic-and-kinetic"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What To Expect In Organic Chemistry 2 &#8211; 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