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Oxidative cyclization of 1 with Br2 yields the tetracoordinate 1,2λ4-oxathietane 2. Instead of an olefin, thermolysis of 2 provided benzophenone and the ketone formed by migration of a phenyl group. Traces of 2,2,3-triphenyloxirane were observed, which hints that a 1,2λ4-oxathietane may be an intermediate in the Corey–Chaykovsky reaction.
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Kawashima et al. (1994) studied this question.
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