Abstract

Stereodefined 2-alkylidenetetrahydrofurans and pyrans were synthesized by treatment of alkyl or aryl acetylenic alcohols with n-BuLi in THF at 0 o C followed by addition of a solution of 10 mol % of Pd(OAc) 2 or PdCl 2 and PPh 3 in THF and 1 equiv of an organic halide

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