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Isomerization
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====Cis vs trans==== Trans-alkenes are about 1 kcal/mol more stable than cis-alkenes. An example of this effect is cis- vs trans-2-butene. The difference is attributed to unfavorable non-bonded interactions in the cis isomer. This effects helps to explain the formation of trans-fats in food processing. In some cases, the isomerization can be reversed using UV-light. The ''trans'' isomer of [[resveratrol]] converts to the ''cis'' isomer in a [[photochemical reaction]].<ref>{{cite journal|title=Resveratrol Photoisomerization: An Integrative Guided-Inquiry Experiment'|author=Elyse Bernard, Philip Britz-McKibbin, Nicholas Gernigon|volume=84|year=2007|journal=Journal of Chemical Education|issue=7 |page=1159|doi=10.1021/ed084p1159 }}</ref> :[[File:Rasveratrol isomerization-en.svg|400px|Resveratrol photoisomerization]]
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