Two sulphur-containing protecting groups for alcoholic hydroxyl functions
Abstract
Two achiral sulphur-containing protecting groups for alcoholic hydroxy-functions are described: the thioether acetal [as in (1b)] is slightly more labile, and the sulphone acetal [as in (1c)] is much less labile, to acidic hydrolysis than the methoxytetrahydropyranyl protecting group [as in (1a)].