for the following products
(+)-4,5-bis[Hydroxy(diphenyl)methyl]-2,2-dimethyl-1,3-dioxolane | (+)-Taddol | (4S,5S)-2,2-dimethyl-alpha,alpha,alpha',alpha'-tetraphenyldioxolane-4,5-dimethanol and (2S,3S)-(+)-4,5-bis-(diphenylhydroxymethyl)-2,2-dimethyl-1,3-dioxolane
