1-O-Acyl-2, 3, 4, 6-tetra-O-acetyl-β-D-glucopyranoses and 1-O-acyl-2, 3, 4, 6-tetra-O-acetyl-β-D-gatactopyranoses were synthesized by reaction of 2, 3, 4, 6-tetra-O-acetyl-α -D-glucopyranosyl bromide and 2, 3, 4, 6-tetra-O-acetyl-α -D-gatactopyranosyl bromide with carboxylic acid, using trienthy benzyl ammonium chloride as phase-transfer catalyst. The method has advantages of mild reaction conditions, easy separation of products and high stereospecificity.

Key words: HEXOSE, AMMONIUM, PHASE TRANSFER CATALYST, PYRANOSE, AMMONIUM CHLORIDE P, GALACTOSE, ORGANIC SYNTHESIS, PYRANOSE, PHASE TRANSFER CATALYSIS, CARBOXYLIC ACID