Tetrahedron

Cyclopropenes electrophiles—II: Synthese par photolyse de dimethyl-3, 3 pyrazolenines

C Dietrich-Buchecker, M Franck-Neumann

Index: Dietrich-Buchecker,C.; Franck-Neumann,M. Tetrahedron, 1977 , vol. 33, p. 751 - 755

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Citation Number: 21

Abstract

The photolysis of 3, 3-dimethyl-3H-pyrazoles derived from 2-diazopropane and acetylenic esters and nitriles leads in good yields to electrophilic cyclopropenes Starting from acetylenic ketones, only the 4-keto-3H-pyrazoles give acylcyclopropenes, the photolysis of the 5-keto-derivatives leading mainly to vinylketenes.