Partial resolutions of a series of organic racemates' have been achieved by partitioning the racemates between an aqueous phase and an optically active ester of d-tartaric acid. A semiquantitative treatment of the data indicates that the observed results are in agreement with those predicted from the normal relationships dealing with solvent extractions. lthough the differences in chemical interactions port of the U. S . Army Research Office, Durham, in conducting this investigation. We also wish to acknowledge the contributions of M. S . Barry and N. Sartoris who conducted certain preliminary studies.Abstract : The reaction of methyl 3-amino-P-~-xylopyranoside (5) with nitrous acid effected a ring contraction to give methyl 3-deoxy-3-C-formyl-P-~-erythrofuranoside (6) as the main product along with small amounts of methyl 2-deoxy-2-C-formyl-~-~-erythrofuranoside (16). Reduction of the aldehyde function with sponge nickel to the diols 7 and 17 followed by esterification, acetolysis, and nucleoside condensation gave 9-(3-deoxy-3-hydroxymethyl-&(and a)-D-erythrofuranosy1)adenine (13) and 9-(2-deoxy-2-hydroxymethyl-P-(and a)-D-erythrofuranosy1)adenine (21). Intervention by a 1,2 ortho ester ion afforded a 5 : 1 ratio of 13b : 13a. No intervention by a 1,3 ortho ester ion was indicated by the 1 : 1 ratio of a and fi anomers in the 2-branched series. Double-resonance nmr was used to identify the 3-branched series.n recent years, branched chain sugars have been dis-
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