The generation of a TME biradical in the photosensitised photolysis of a bi-(1-pyrazolin-4-ylidene)

Abstract

The direct photolysis and flash vacuum pyrolysis of 3,3,3′,3′,5,5,5′,5′-octamethyl-bi-(1-pyrazolin-4-ylidene) {A figure is presented} proceeds via a sequence of TMM intermediates but in the photosensitised photolysis a TME intermediate is formed.