A New Glycosylation Procedure Utilizing Rare Earth Salts and Glycosyl Fluorides, With or Without the Requirement of Lewis Acids.-The described new glycosylation procedure using Yb(OTf)3 or YbCl3, without or with the Lewis acids ZnCl2 or Ba (ClO4)2, is demonstrated for a variety of examples. β-or α-Selectivity is found to be dependent on the base used. -(HOSONO, S.; KIM, W.-S.; SASAI, H.; SHIBASAKI, M.; J.

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