Complexes of carbohydrates with metal cations. IX. Synthesis of the methyl D-tagatosides, D-psicosides, D-apiosides and D-erythrosides

Abstract

All the methyl glycosides of the sugars mentioned in the title were synthesized by Fischer glycosidation in the absence or in the presence of calcium chloride; addition of the salt improved the yield of some of the furanosides. The glycosides were separated on a cation-exchange resin in its calcium form. The anomeric equilibria of methyl furanosides are discussed.