Mild protection and deprotection of alcohols as ter-butyl ethers in the field of pheromone synthesis

α,ω-Halohydrins and Ω-acetylenic alcohols are protected as t-butyl ethers by reaction with isobutene and an acid catalyst : Amberlyst H-15. t-Butyl ethers are, in turn, cleaved to acetates by Ac2O and 10% FeCl3 in Et2O solvent. Under these mild conditions conjugated dienic systems are neither destroyed nor isomerized