2-Deoxy α-O-aryl glycosides were conveniently obtained by reaction of 2-deoxy-glycosyl acetates with phenols in the presence of TMSOTf as the promoter. The current method provides the O-aryl glycosides with good to excellent yields, and sole alpha selectivity. Figure
The absolute configuration of the title compound, C 12 H 15 NO 7 Á0.5H 2 O, was assigned from the synthesis. There are two rhamnoside molecules and one water molecule in the asymmetric unit, displaying O—HÁ Á ÁO hydrogen bonding. One of the nitro groups does not conjugate efficiently with the benzene ring.