Topic
Aldose
About: Aldose is a research topic. Over the lifetime, 1270 publications have been published within this topic receiving 27197 citations. The topic is also known as: aldoses.
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TL;DR: Aldoses are degraded by vanadium pentaoxide in m sulphuric acid into formic acid, and aldonic acids are degraded into carbon dioxide and the next lower aldose as mentioned in this paper.
8 citations
Patent•
21 Mar 1972
TL;DR: In this paper, the authors present a method for manufacturing keto-sugars from ALDOSE SUGARS by heating a solution of the mixture of the two in the presence of an ALKALI or ALkaline EARTH ALUMINATE CATALYST.
Abstract: THE INVENTION IS DIRECTED TO A METHOD FOR MANUFACTURE OF KETOSE SUGARS FROM ALDOSE SUGARS BY HEATING A SOLUTION OF THE ALDOSE SUGAR IN THE PRESENCE OF AN ALKALI OR ALKALINE EARTH ALUMINATE CATALYST SO AS TO CONVERT THE ALDOSE SUGAR TO A KETOSE SUGAR IN HIGH YIELDS. THEREAFTER, THE KETOSE SUGAR IS RECOVERED FROM THE REACTION MIXTURE BY TREATMENT WITH A SUITABLE AGENT.
8 citations
TL;DR: The kinetic effect of subcritical aqueous alcohols on the isomerization of hexoses (mannose, glucose, and fructose) was examined at 180°C at the alcohol concentrations ranging from 0 to 80% (v/v) as discussed by the authors.
Abstract: The kinetic effect of subcritical aqueous alcohols (methanol, ethanol, 1-propanol, 2-propanol, and t-butyl alcohol) on the isomerization of hexoses (mannose, glucose, and fructose) was examined at 180 °C at the alcohol concentrations ranging from 0 to 80% (v/v). The results showed that increase in the concentration of primary and secondary alcohols markedly promoted the aldose-to-ketose isomerization; however, the ketose was scarcely isomerized to aldose and predominantly decomposed. Further, the kinetic analysis revealed that the rate constants of isomerization and decomposition strongly depended on the dielectric constant of the aqueous alcohols. The rate constants for isomerization were more sensitive to the change in the dielectric constant than the decomposition rate constants. On the other hand, the isomerization reactions of mannose and fructose were suppressed in subcritical aqueous t-butyl alcohol despite the low dielectric constant of the solution.
8 citations
TL;DR: In this article, methanolysis of 5-deoxy-5th-thio-D-glucose derivatives gave the 4-O-methyl glycoside 4 and the 4,6-di-Omethylated dimethyl acetal 7, indicating transannular participation of the sulfur atom.
8 citations
TL;DR: In this paper, the 4-aldose d -aldose diethyl dithioacetals (1a-d ) were treated with bromine to give the corresponding, unstable 1-bromides, which were immediately condensed with 6-chloro-9-(chloromercuri)purine (3) to furnish the respective, protected nucleosides.
8 citations