Question
Show transcribed image text 16. 4 + 2 cycloadditions(Diels-Alder reactions) stereospecifically form new 6-membered rings as products. Cyclohexa-1,3-diene undergoes a very rapid Diels-Alder reaction with cis 1,2-dicyanoethene to form a single product: the endo bicyclo[2.2.2]octane shown. There are three open-chin versions of cyclohexadiene: The cis/cis isomer (A), the trans/trans isomer (B) and the cis/trans isomer (C). Each of these isomers reacts stereospecifically with cis 1,2-dicyanoethene to give a single product. All three of these products are different from one another. One of the three reactions is fast, one is very slow and one is proceeds at a moderate rate. Draw the product that results from each reaction and label each reaction as slow, moderate or fast. (6 points)
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