Glucopyranosyl-D-mannose

The treatment of cellobial with perbenzoic acid and water leads predominantly to 4-( 8-D-glucopyranosyl)-D-mannose.38 On the other hand, the treatment of hexaacetylcellobial in the same manner leads predominantly to cellobiose, which has been isolated as the octaacetyl derivative. Hexaacetylcellobial has also been made from the synthetically prepared epicellobiose, and the conversion of hexaacetylcellobial to cellobiose has completed the total synthesis of this important sugar.17... 

Treatment of maltal with perbenzoic acid and water gives epimal-tose,18 68 (4-(a-D-glucopyranosyl)-D-mannose) (LXVIII), in which the o-mannose moiety was identified after acid hydrolysis of the disaccharide. 

Smith and Srivastava showed that lies mannan, from the tubers of a species of Amorphophalhis, is a true glucomannan (of the same type as wood glucomannans) by isolating 4-0-/3-D-mannopyranosyl-D-glucose and 4-0-/3-D-glucopyranosyl-D-mannose from a partial hydrolyzate. 

D-Glucopyranosyl-D-mannitol -form, G-419 6-0-a-D-Glucopyranosyl-D-mannose Pyranose-/i wi 2-Benzyl, hepta-Ac,... 

Linked disaccharides, on treatment with a Ni(II) diamine complex, undergo epimerisation at C-2. For example, isomaltose can be converted into a mixture containing 6-Q-a-D-glucopyranosyl-D-mannose as the major epimer. The reaction, which has been reported before for monosaccharides (Vol 20, p 11-12), did not proceed with 1,4-linked dimers e.g. cellobiose." Similarly, 1,6-linked disaccharides are more reactive towards Fenton s reagent (Fe(II), HaOa) than are 1,4-bonded isomers. ... 

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