Changes in the photochemistry of tropone or 2-methoxytropone on complexation with acids

M Cavazza, M Zandomeneghi, F Pietra

Index: Cavazza, Marino; Zandomeneghi, Maurizio; Pietra, Francesco Journal of the Chemical Society, Chemical Communications, 1990 , # 19 p. 1336 - 1337

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Citation Number: 3

Abstract

On addition of either BF3· Et2O or H2SO4 the valence photoisomerization of 2- methoxytropone (1) in CH3CN is diverted from 1-methoxy-(2) to 3-methoxybicyclo [3.2. 0] hepta-3, 6-dien-2-one (3) as products whereas with tropone there is a change from photodimerization to valence isomerization to give cleanly bicyclo [3.2. 0] hepta-3, 6-dien-2- one (5).