Catalytic amount of lithium tetrafluoroborate in dry acetonitrile
catalyzes an efficient tetrahydropyranylation of different
types of alcohols to afford the corresponding tetrahydropyranyl
ethers in high yields. Deprotection of tetrahydropyranyl
ethers can also be achieved efficiently in the presence of
lithium tetrafluoroborate in methanol. The chemoselectivity
was observed in the protection of alcoholic function in the
presence of phenolic function.
