An Improved Synthesis of (+)-3,4-O-Isopropylidene Butyne

Abstract
(+)-3, 4-O-Isopropylidene butyne ( 1 ) has been prepared in 81% isolated yield from (+)-2, 3-isopropyli-dene-D-glyceraldehyde ( 2 ) using a modified Corey-Fuchs procedure.