Sv. Ley et al., DISPIROKETALS IN SYNTHESIS .20. PREPARATION OF CHIRAL 2,2'-BIS(HALOMETHYL) AND 2,2'BIS(PHENYLTHIOMETHYL)DIHYDROPYRANS, Synlett, (8), 1996, pp. 787
The preparation of 2,2'-bis(bromomethyl), 2,2'-bis(iodomethyl) and 2,2
'-bis(phenylthiomethyl)dihydropyrans is described for potential use as
selective protecting agents for 1,2-diols as their corresponding disp
iroketals.