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Highly α-selective glycosylation of various glycosyl acceptors with glucopyranosyl fluoride having diethylthiocarbamoyl group at 6-position or galactopyranosyl fluoride having the same group at 4-position proceeded smoothly in the presence of a catalytic amount of protic acid to afford the corresponding disaccharides in high yields.
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Mukaiyama et al. (2002) studied this question.
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