Dibutyltin oxide catalyzed allyl-transfer reaction from tertiary homoallylic alcohols to aldehydes

A catalytic allyl-transfer reaction from tertiary homoallylic alcohols to aldehydes was achieved using dibutyltin oxide as a catalyst in toluene under reflux conditions. Various secondary homoallylic alcohols were prepared in high yield (up to 99%). When beta-alkylated tertiary homoallylic alcohols were used, branched products were exclusively obtained.