... Pergamon Journals Ltd. A NEW, STEREOSELECTIVE SYNTHESIS OF METHYL 1,2-TRANS-l-THIOGLYCOSIDES” Vince Pozsgay and Harold J. Jennings Division of Biological Sciences, National Research Council of Canada, Ottawa, Ontario, Canada KlA OR6 SUMMARY: Per-0-acetylated glycopyranoses were converted by methylthiotrimethylsilane in the presence of boron trifluoride or trimethylsilyl trifluoromethanesulfonate to the ...