Modifications in the nitric acid oxidation of D-mannose: X-ray crystal structure of N,N0-dimethyl D-mannaramide
Nitric acid oxidation of D-mannose was carried out under an oxygen atmosphere using a computer controlled reactor. The process represents a catalytic oxidation of D-mannose with oxygen as the terminal oxidant. The crude oxidation product was esterified with methanolic HCl and the esterified product directly converted to crystalline N,N0-dimethyl-D-mannaramide with methylamine. Treatment of the diamide in aqueous sodium hydroxide gave solid disodium D-mannarate. The X-ray crystal structure of N,N0-dimethyl-D-mannaramide was determined as a model for the repeating D-mannaramide units of stereoregular poly(alkylene-D-mannaramides). Disodium D-mannarate was prepared as a precursor of esterified D-mannaric acid for use as a reactive diacid monomer to prepare poly-D-mannaramides.
Carpenter, Chrissie A.,Hardcastle, Kenneth I.,Kiely, Donald E.
Kinetics and mechanism of the oxidation of ethyl glycol, D-mannitol and D-sorbitol by hexacyanoferrate(III) ion in aqueous alkaline medium
The rate of oxidation of ethyl glycol, D-mannitoI and D-sorbitol by hexacyanoferrate(III) ion in aqueous alkaline medium is directly proportional to the organic substrate and hydroxide ion concentrations. The dependence of rate on hexa-cyanoferrate(III) ion is nearly first order at lower concentrations and tends towards zero order at higher concentrations. A probable reaction mechanism has been suggested.
Singh,Verma,Gupta, Arti,Mittal, Anjali
p. 392 - 394
(2007/10/03)
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