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Abstract
Unsaturated 1,4-disaccharides are obtained in quite good yields by alkylation of ethyl α-O-Δ2-glycosides, having a leaving group at C-4, with various 1-hydroxycarbohydrates in the presence of a catalytic amount of palladium(0). The reaction is regio-and-stereospecific for α-erythro enosides 3 and 5, and only stereospecific in the case of the β-threo enoside 7, alkylation occuring at C-4 and C-2 in this case.