When diphenyl sulfoxide was allowed to react with bromine in a mixture of acetic acid and 18O-enriched water, the sulfoxide was recovered, together with a small amount of diphenyl sulfone. The sulfoxide recovered incorporated a very small amount of 18O from the water. Meanwhile, diphenyl sulfoxide was found to undergo a facile oxygen exchange reaction with water in the presence of hydrobromic acid. Possible mechanisms for these reactions have been discussed.
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Tagaki et al. (1966) studied this question.
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