Conversion of Alkyl- and Arylallenes into 1-Alkynes Through Metallated Intermediates

Abstract: A number of acetylenes RCH2C=CH have been obtained by metallation of the allenes RCH=C=CH2 or mixtures of acetylenes and allenes with n-BuLi in THF-hexane and hydrolysis after allowing the metallated allenes to rearrange at room temperature or by heating under reflux.