6-Deoxy-3,4-O-isopropylidene-2-C-methyl-L-galactono-1,5-lactone

Abstract

X-ray crystallography unequivocally confirmed the stereochemistry of the 2-C-methyl group in the title mol­ecule, C10H16O5, in which the 1,5-lactone ring exists in a boat conformation. The absolute stereochemistry was determined by the use of d-ribose in the synthesis. The crystal exists as O—H⋯O hydrogen bonded chains of mol­ecules running parallel to the a axis with each mol­ecule acting as a donor and acceptor for one hydrogen bond.