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In the presence of trityl tetrafluoroborate, silyl enol ethers react with thioacetals to give the corresponding γ-ketosulfides in good yields with high stereoselectivity. In a similar manner, γ-ketosulfides are obtained in good yields by the one pot reaction directly from ketones and thioacetals via tin(II) enolates.
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Ohshima et al. (1985) studied this question.
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