Abstract

AbstractThe halohydroxylation reaction of 1,2-allenyl sulfoxides exhibitsE-selectivity while those of analogous sulfides and selenides showZ-selectivity. Rationales for the stereoselectivities are proposed. The reaction of 2,3-allenols with X+affords 3-halo-2,5-dihydrofurans or 3-halo-3-enals depending on the nature of the alcohols.

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