Abstract

Determination of the reactivity of Bu 3Sn· with the carbonyl group of an alkyl aryl ketone and the chlorine atom of a primary alkyl chloride have shown similar types of reaction. These results led us to reconsider the mechanism of 2-phenyltetrahydrofuran formation in reduction reactions of γ-chlorobutyrophenone by tributyltin hydride. This cyclic ether was obtained by elimination of tributyltin chloride from the product of carbonyl hydrostannation. A similar study on an aldehyde and 1-chloroalkane revealed the mechanism of cyclohexanol formation in reduction reactions of 6-chlorohexanal by tributyltin hydride. Tributyltin hydride treatment of 7-chloroheptan-2-one and 6-chlorohexan-2-one led to heptan-2-one and hexan-2-one in good yields; no cyclization product is observed.

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