Photoinduced ring enlargement reactions of 2H-1, 2, 4-benzothiadiazine 1, 1-dioxides. Steady-state and laser flash photolysis studies

CV Kumar, KR Gopidas, K Bhattacharyya…

Index: Kumar, C. V.; Gopidas, K. R.; Bhattacharyya, K.; Das, P. K.; George, M. V. Journal of Organic Chemistry, 1986 , vol. 51, # 11 p. 1967 - 1972

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Citation Number: 6

Abstract

Ring-enlargement reactions of several W-1, 2, 4-benzothiadiazine 1, l-dioxides under photoexcitation have been studied by steady-state irradiation, product analysis, and laser flash photolysis. Irradiations in benzene or methanol gave moderate yields (14-70%) of 6- methyl-5H-dibenzo [b, g][1, 4, 6] thiadiazocine 12, 12-dioxides in most cases. The product formation may take place either by a direct ring enlargement process to a precursor (7), ...

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