Reaction of phenyl-trimethylsilylethers (3) with 1-O-trimethylsilyl-2,3,4,6-tetra-O-acetyl-D-glucoside (1) (anomeric mixture) yields almost exclusively the aryl-β-glucosides (4) in the presence of catalytic amounts of TMS-triflate at 20°C, whereas (3) and 1-O-trimethylsilyl-2,3,4,6-tetra-O-benzyl-D-glucoside (2) gives mainly the aryl-α-glucosides (8).