Ultraviolet irradiation of the saturated β‐ketosulfides 6 and 7 (direct n → π* excitation) in benzene and methanol solutions resulted mainly in the selective α‐cleavage of the bond between CO and Cα‐S, producing ketenes by the well known hydrogen transfer as secondary reactions. Depending upon the availability of internal and/or external nucleophiles, the compounds 8, 9, 10 and 11 were formed as major products. The high yields in some of these light‐induced transformations open an attractive synthetic approach to new heterocompounds.
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Ganter et al. (1968) studied this question.