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also used to help maintain and monitor the internal temperature and preventing it from going above 190 °C. c.Between the two compounds given, the compound that reacts faster in a Diel-Alder reaction would be cyclopentadiene.d.The reason why cyclopentadiene reacts faster than anthracene ina Diels-Alder reaction because of the fact that cyclopentadienes are generally more reactive in such a reaction. The mechanism behind this is the fact that cyclopentadiene is locked in the s-cis conformation, and compounds under this conformation are able to undergo a Diels-Alder reactions rapidly. Diel-Alder reactions generally occur when the compound is in the s-cis conformations while they are unreactive to compounds in the s-trans conformation. A diene locked in the s-trans conformation would end up having its ends too far apart to react with the dienophile. 1,3-butadiene exists in an equilibrium between s-cis and s-trans. Therefore, the reaction occurs faster with cyclopentadiene since it is locked in the s-cis configuration. 3)
4)Works Cited1.Mayo, Microscale Organic Laboratory with Multistep and Multiscale Syntheses, 5th ed.pages 269-2732.Modifications for Expt 15: Diels-Alder Reaction, Blackboard document.