Asymmetric Synthesis of Homopropargylic Alcohols from Aldehydes and Allenyltri-n-butylstannane.

Abstract The reaction of allenyltri- n -butylstannane with aldehydes and a chiral Lewis acid prepared from (R)-BINOL and Ti(O- i -Pr) 4 gives homopropargylic alcohols with 82 ->99% ee.