Photochemical ring-expansion reaction of 1, 2-benzisothiazolinones

N Kamigata, S Hashimoto, M Kobayashi…

Index: Kamigata, Nobumasa; Hashimoto, Satoshi; Kobayashi, Michio; Nakanishi, Hiroshi Bulletin of the Chemical Society of Japan, 1985 , vol. 58, # 11 p. 3131 - 3136

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Citation Number: 18

Abstract

The photochemical reaction of a series of 2-aryl-1, 2-benzisothiazol-3 (2H)-ones (1) under deaerated conditions was found to give dibenzo [b, f][1, 4] thiazepin-11 (10H)-ones (2). A mechanism through a biradical species is proposed for the photoreaction. When the photolysis of 1 was carried out in the presence of oxygen, 2-aryl-1, 2-benzisothiazol-3 (2H)- one 1-oxides (11) were formed together with compounds 2.