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Direct conversion of tert-beta-bromo alcohols to ketones with zinc sulfide and DMSO.

tert-Beta-bromo alcohols, derived from simple monoterpene hydrocarbons, react with zinc sulfide in dimethyl sulfoxide to afford saturated ketones as the major and hydroxy ketones as the minor products. The reaction involves initial nucleophilic attack by DMSO on the carbon attached to the halogen, which is assisted by electrophilic zinc sulfide. Subsequent Kornblum type oxidation yields the alpha-hydroxy ketone. On the other hand, abstraction of proton beta to the hydroxyl group followed by an attack of the neighboring hydroxyl moiety on the sulfur of the dimethylsulfoxonium intermediate and its subsequent collapse yields an enol, which tautomerizes to a saturated ketone. The latter pathway is predominantly followed.[1]

References

  1. Direct conversion of tert-beta-bromo alcohols to ketones with zinc sulfide and DMSO. Bettadaiah, B.K., Gurudutt, K.N., Srinivas, P. J. Org. Chem. (2003) [Pubmed]
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