{"id":37307,"date":"2025-06-25T15:07:36","date_gmt":"2025-06-25T15:07:36","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=37307"},"modified":"2025-06-25T15:07:38","modified_gmt":"2025-06-25T15:07:38","slug":"this-is-the-ir-spectrum-of-the-adduct-of-maleic-anhydride-alpha-terpinene","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/this-is-the-ir-spectrum-of-the-adduct-of-maleic-anhydride-alpha-terpinene\/","title":{"rendered":"This is the IR spectrum of the adduct of Maleic Anhydride + alpha-terpinene"},"content":{"rendered":"\n

This is the IR spectrum of the adduct of Maleic Anhydride + alpha-terpinene (Diels-Alder reaction of the Diene from eucalyptus oil). I need to interpret this data for my results report. What are the important points (so I can make a table with it) and give a short interpretation of it? This is my first organic experiment, so I’m having a hard time interpreting the data. Thank you in advance!<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

You’re very welcome! Here’s a guide to help you interpret the IR spectrum of the Diels\u2013Alder adduct of maleic anhydride and \u03b1-terpinene<\/strong>, and present it clearly in a results report.<\/p>\n\n\n\n

\n\n\n\n

\ud83d\udcca Key IR Absorption Peaks Table<\/strong><\/h3>\n\n\n\n
Wavenumber (cm\u207b\u00b9)<\/th>Functional Group \/ Vibration<\/th>Interpretation \/ Significance<\/th><\/tr><\/thead>
~3050<\/td>C\u2013H stretch (alkene)<\/td>Indicative of alkene C\u2013H bonds (if present)<\/td><\/tr>
~2950 \u2013 2850<\/td>C\u2013H stretch (sp\u00b3 alkane)<\/td>Shows saturated alkyl C\u2013H stretching<\/td><\/tr>
~1770 & ~1850<\/td>C=O stretch (anhydride)<\/td>Strong double peak characteristic of anhydrides<\/td><\/tr>
~1600<\/td>C=C stretch (aromatic or alkene)<\/td>Present in diene before reaction; reduced after<\/td><\/tr>
~1200 \u2013 1300<\/td>C\u2013O stretch (anhydride)<\/td>Confirms presence of cyclic anhydride group<\/td><\/tr>
~1000 \u2013 1100<\/td>C\u2013O stretch (ether or alcohol, if present)<\/td>Could support ring closure or oxygen function<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n

\ud83d\udd0d Short Interpretation for Results Section<\/strong><\/h3>\n\n\n\n

The IR spectrum of the adduct formed by reacting maleic anhydride with \u03b1-terpinene via the Diels\u2013Alder reaction provides key structural evidence confirming the formation of a cyclohexene derivative bearing a succinic anhydride group. One of the most significant features is the presence of two strong carbonyl absorption bands around 1770 and 1850 cm\u207b\u00b9<\/strong>, which is typical of a cyclic anhydride<\/strong>. These peaks confirm that the anhydride moiety from maleic anhydride is retained in the product and has not hydrolyzed.<\/p>\n\n\n\n

A broad set of peaks between 2950 and 2850 cm\u207b\u00b9<\/strong> correspond to sp\u00b3 hybridized C\u2013H stretching<\/strong> vibrations, indicating the saturated nature of much of the carbon framework in the product. This supports the expected cycloaddition that converts the diene and dienophile into a saturated ring.<\/p>\n\n\n\n

The peak around 1600 cm\u207b\u00b9<\/strong>, which would represent an alkene (C=C) stretch in the starting materials, is significantly diminished or absent in the adduct. This supports the loss of the diene\u2019s double bond system during the Diels\u2013Alder reaction.<\/p>\n\n\n\n

Additional peaks around 1200 to 1300 cm\u207b\u00b9<\/strong> correspond to C\u2013O stretching<\/strong>, which, along with the strong anhydride carbonyl bands, further supports the presence of a cyclic anhydride functional group<\/strong>.<\/p>\n\n\n\n

Overall, the spectrum confirms that a Diels\u2013Alder cycloaddition has occurred and that the anhydride group is intact in the final product.<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

This is the IR spectrum of the adduct of Maleic Anhydride + alpha-terpinene (Diels-Alder reaction of the Diene from eucalyptus oil). I need to interpret this data for my results report. What are the important points (so I can make a table with it) and give a short interpretation of it? This is my first […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-37307","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/37307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=37307"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/37307\/revisions"}],"predecessor-version":[{"id":37309,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/37307\/revisions\/37309"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=37307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=37307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=37307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}