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Methyl α-D-glucopyranoside is converted to methyl 6-p-toluenesulfonyl-2,3,4-tris-O-trimethylsilyl- α-D-glucopyranoside 2 and then reacted with lithium diphenylphosphide in THF. When the reaction is carried out at room tem perature and below, S-O cleavage dominates giving methyl 2,3,4-tris-O-trimethylsilyl-α-D-glucopyranoside 3 , whereas at 60°C in THF or at 35°C in diethyl ether, C-O cleavage occurs yielding the title carbohydrate-phosphine 4 in good yield after deprotection

Synthesis of Methyl 6-Deoxy-6-diphenylphosphino-α-D-glucopyranoside: Temperature-Dependence of the Primary O-Tosyl Cleavage Mode