ChemInform Abstract: Asymmetric Synthesis of (+)- and (-)-2-(2-Methoxyphenyl)-3,1- benzoxathiane

Enantiomerically pure (−)-(1 R )-tricarbonyl-(2-methoxybenzaldehyde)chromium reacts with 2-mercaptobenzylalcohol to give the corresponding diastereomeric thioacetal complexes, which are separated and transformed quantitatively into the enantiomerically pure thioacetals (+)- and (−)-5 by removing the chromium tricarbonyl moiety.