reactions is mainly of the β-[13] type, good yields are obtained for the synthesis of 2-nitrophenyl-β-D-galactopyranosyl-[13]-β-D-galactopyranoside and 2-nitrophenyl-β-D-glucopyranosyl-[13]-β-D-glucopyranoside. Conversely, in the presence of p-nitrophenylfucoside, the autocondensation is very limited, and with methyl-α-D-galactoside as an acceptor, the regioselectivity is mainly of the β-[16]-type resulting