for the following products
(2S,3S)-(+)-Dimethyl-2,3-O-isopropylidene tartrate | (4S,5S)-2,2-Dimethyl-1,3-dioxolane-4,5-dicarboxylic acid dimethyl ester | (4S,5S)-Diethyl 2,2-dimethyl-1,3-dioxolane-4,5-dicarboxylate and (+)-Dimethyl-2,3-O-isopropylidene-D-tartrate
