Beta-galactosidase from bovine liver and from E. coli was successfully employed in the glycosylation of the monoallyl and monobenzyl ether (2 and 9, resp.) of 1,3,5-benzene-trimethanol. The monoglucoside of 2 was obtained in 65% yield. Galactosylation of the isopropylidene protected monoglucoside yielded the monoglucosyl monogalactosyl adduct (17%) and the monoglucosyl bisgalactosyl adduct (10%). 9 was converted into the bisarabinopyranosyl adduct (3%).