Enantiopure derivatives of 1,1,2-triphenylethane-1,2-diol by unusual ring opening of its cyclic sulfite

Article abstract of DOI:10.1002/jlac.199719970621

The reaction of triphenylglycol (S)-1 with thionyl chloride leads to the cyclic sulfites 2a and 2b in a ratio of 90:10. When the mixture of diastereomers 2a/b is treated with alcohols 3 or diols 6, enantiomerically pure ethers 5 and 7 are obtained by an u