Abstract
The title compound, C19H30O9, was prepared by substitution at the C6 position in 1,2;3,4-di-O-isopropylidene-6-O-trifluoromethanesulfonyl-d-galactose using sodium ethoxymalonate in dimethylformamide. The conformation is skew-boat 0 S 2, slightly distorted towards boat B 2,5. The inflexible pyranose structure makes the title compound a suitable intermediate for further synthetic work by keeping stereogenic carbon atoms safe from inversion. Several short intramolecular C—H⋯ O contacts may stabilize the conformation of the molecule. Intermolecular C—H⋯O interactions also occur.
Highlights
The title compound, C19H30O9, was prepared by substitution at the C6 position in 1,2;3,4-di-O-isopropylidene-6-Otrifluoromethanesulfonyl-d-galactose using sodium ethoxymalonate in dimethylformamide
The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry
The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2
Summary
Bogdan Doboszewski,a Paulo R. da Silva,a Alexander Y. Crystal data a Departamento de Quımica, Universidade Federal Rural de Pernambuco, 52171-900. PE, Brazil, bChemistry Department, State University of New York, College at Buffalo, 1300 Elmwood Ave, Buffalo, NY 14222-1095, USA, and cDepartment of Chemistry & Biochemistry, University of Minnesota Duluth, Duluth, Minnesota
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