The Preparation of Geometrical Isomers of β-Nitrostyrene and Their Addition Reactions with Ethanol

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Abstract
The preparation of the geometrical isomers of ethyl α-nitrocinnamate and α-nitrochalcone is described. Ethyl (E)-α-nitrocinnamate and (Z)-α-nitrochalcone were obtained by the thermal- or photoisomerization of the corresponding geometrical isomers, which were themselves produced predominantly through the Knoevenagel reaction. The facile addition of ethanol to the double bonds of β,β-dinitrostyrene, ethyl α-nitrocinnamates, and α-nitrochalcones without any catalyst at room temperature is also described.