It was found that α-cyanovinylsulfones, which were prepared by an improved Knoevenagel condensation, react readily with 1,3-dioxolane under ultraviolet irradiation in the presence of a photosensitizer. The reaction provided a new convenient method for the preparation of 3,4-disubstituted pyrroles.
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Inomata et al. (1988) studied this question.
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