Download Advances in Carbohydrate Chemistry and Biochemistry, Vol. 7 by Sidney M. Cantor PDF

By Sidney M. Cantor

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Extra info for Advances in Carbohydrate Chemistry and Biochemistry, Vol. 7

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If it should prove valid, more definite statements along the lines of the present discussion will be possible concerning the requirements for glycol cleavage and the spatial relationship between adjacent trans hydroxyl groups. VI. RELATIONSHIP BETWEEN THE OBSEBVEDRESISTANCE TO OXIDATION DETECTION OF ~ , ~ - D I GROUPS oL IN OTHERCARBOHYDRATE STRUCTURES The ability of lead tetraacetate and periodate to cleave oxidatively lJ2-diols has provided a valuable and generally accepted diagnostic tool for the detection and estimation of lJ2-glycol structures.

The future discovery of other compounds having similarly resistant lJ2-diol groups will provide a basis for testing the validity of this hypothesis. If it should prove valid, more definite statements along the lines of the present discussion will be possible concerning the requirements for glycol cleavage and the spatial relationship between adjacent trans hydroxyl groups. VI. RELATIONSHIP BETWEEN THE OBSEBVEDRESISTANCE TO OXIDATION DETECTION OF ~ , ~ - D I GROUPS oL IN OTHERCARBOHYDRATE STRUCTURES The ability of lead tetraacetate and periodate to cleave oxidatively lJ2-diols has provided a valuable and generally accepted diagnostic tool for the detection and estimation of lJ2-glycol structures.

While it previously had seemed that this limit was represented by the transition from a 1,2- t o a 1,3-diol, it now appears that it may occur even while the hydroxyls are on adjacent carbon atoms, as in 1,6-anhydro-~-~-glucofuranose and 1,6-anhydro-a-~galactofuranose. Therefore, a consideration of the space relations of the adjacent hydroxyl groups in some carbohydrates seems proper at this point, particularly relative to coordination complex formation. In the usual writing of stereochemical formulas of carbohydrates by the Fischer and Haworth conventions, the hydroxyls in a ring are depicted as either cis or trans.

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