[Antigenic bacterial polysaccharides. 30. The structure of the polysaccharide chain of lipopolysaccharide of Pseudomonas syringae pv. syringae 281 (serogroup I)].

Anomeric methyl 3-O-(D-mannopyranosyl- and L-rhamnopyranosyl)-beta-D-talopyranosides were synthesised by the stereoselective 1,2-cis- and 1,2-trans manno- and rhamnosylation of methyl 2,4,6-tri-O-acetyl-beta-D-talopyranoside, which has been prepared from methyl beta-D-galactopyranoside by a synthetic scheme including conversion of the C2 configuration. From 13C-NMR spectra of the disaccharides obtained the spectral alpha- and beta-effects of O3-glycosylation of talopyranose were determined.