aldoses

As shown in Table 1, isomerases that are specific for 2R-aldoses were found to activate the 1-R proton of the ketose produced.

Irwin Rose - Autobiography 2005

_ -- The _aldoses_ are fully esterified, in the pentoses 4 OH, in the hexoses 5 OH groups reacting.

Researches on Cellulose 1895-1900 C. F. Cross

The molecular proportion of the aldoses affected appears to be in considerable excess, and the reaction is probably complicated by interior rearrangement.

Researches on Cellulose 1895-1900 C. F. Cross

CO group in both aldoses and hexoses, whence we may conclude that in the plant-cell the transition from dextrose to levulose is a very simple and often occurring process.

Researches on Cellulose 1895-1900 C. F. Cross

In the systematic investigation of the nitric esters of the carbohydrates (p. 41) Will and Lenze have definitely differentiated the ketoses from the aldoses, as showing an internal condensation accompanying the ester reaction.

Researches on Cellulose 1895-1900 C. F. Cross

Not only are the OH groups taking part in the latter consequently less by two than in the corresponding aldoses, but the nitrates show a much increased stability.

Researches on Cellulose 1895-1900 C. F. Cross

Among various aldoses, the C. magnoliae JH110 ER showed high specific activity for reduction of erythrose to the corresponding alcohol, erythritol.

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2S-aldoses produce ketoses that exchange their 1S proton11.

Irwin Rose - Autobiography 2005

-- These are sharply differentiated from the corresponding aldoses by giving _tri_nitrates C_ {6} H_ {7} O_ {2} (NO_ {3}) _ {3} instead of _penta_nitrates, the remaining OH groups probably undergoing internal condensation.

Researches on Cellulose 1895-1900 C. F. Cross

C_ {6} H_ {12} O_ {6} - 4H_ {2} O + HBr = C_ {5} H_ {3} (CH_ {2} Br) O and generally the ketoses are distinguished from the aldoses by their susceptibility to condensation.

Researches on Cellulose 1895-1900 C. F. Cross