Abstract
One step formation of the tricyclic dichloroethylidyne ortho esters from the reaction of trichloroethylidene acetals of D-galactose and D-arabinose with K tert-butoxide are described. The possible intermediate, i.e, ketene acetal was prepared separately, from the suitably protected 1,2-O-trichloroethylidene-α-D-galactofuranose. Stereoselective formation of an ortho ester anhydride, from the ketene acetal is also described.
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