The Diels-Alder reaction of individual (E)- and (Z)-isomers of ethyl 3-nitroacrylate and 3-nitrocrotonate with 1,3-butadiene, 1-acetoxy- or 1,4-diacetoxy-1,3-butadiene was conducted to give ethyl 6-nitro-3-cyclohexene-, 5-acetoxy-, and 2,5-diacetoxy-6-nitro-3-cyclohexene-carboxylates, respectively. The stereochemistry of the cycloaddition products has been elucidated by analysis of the NMR spectrum.
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Shin et al. (1978) studied this question.
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