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)].
J. H. van Boom, P. van Deursen, J. Meeuwse and C. B. Reese, J. Chem. Soc., Chem. Commun., 1972, 766 DOI: 10.1039/C39720000766
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