for the following products
(-)-Taddol | (2R,3R)-(-)-4,5-bis-(diphenylhydroxymethyl)-2,2-dimethyl-1,3-dioxolane | (4R,5R)-2,2-dimethyl-alpha,alpha,alpha',alpha'-tetraphenyldioxolane-4,5-dimethanol and (-)-2,3-O-Isopropylidene-1,1,4,4-tetraphenyl-L-threitol
