The cycloaddition of nitrilimines with 1, 2-dibenzoylethylenes.

T Oida, T Shimizu, Y Hayashi, K Teramura

Index: Oida, Tatsuo; Shimizu, Tomio; Hayashi, Yoshiyuki; Teramura, Kazuhiro Bulletin of the Chemical Society of Japan, 1981 , vol. 54, # 5 p. 1429 - 1433

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Citation Number: 16

Abstract

The cycloaddition of nitrilimines with 1, 2-dibenzoylethylenes gave an unexpected 1, 3-diaryl- 4-benzoylpyrazole and benzoic acid, along with an expected cycloadduct, 1, 3-diaryl-4, 5- dibenzoyl-2-pyrazoline, and its dehydrogenated product, 1, 3-diaryl-4, 5-dibenzoylpyrazole. The elimination of the benzoyl group from the pyrazoline followed by dehydrogenation was shown to be the course of the unusual reaction.