24. 6: Reduction of Monosaccharides to Alditols Sodium borohydride reduction of an aldose makes the ends of the resulting alditol chain identical, HOCH 2 (CHOH) n CH 2 OH, thereby accomplishing the same configurational change produced by oxidation to an aldaric acid
Alditol - an overview | ScienceDirect Topics Strong oxidizing agents (e g , nitric acid) oxidize both ends of the alsose molecule and give rise to aldaric acid For example, glucose is oxidized by bromine water to gluconic acid, which is isolated as the δ-lactone
9. 4 Oxidation and Reduction Reactions of Monosaccharides The carbonyl group in aldoses and ketoses can be reduced by sodium borohydride, NaBH 4, to produce polyalcohol which is known as alditol Reduction of aldose forms one alditol product as shown in Fig 9 4i
The Carbohydrates [C(H2O)]n - Yale University Arabinose forms an optically active aldaric acid (arabinaric acid) and optically active alditol (arabitol) as its borax complex Arabinose is and not (+)-Glucose is one of these structures
25. 6: Reactions of Monosaccharides - Chemistry LibreTexts By converting an aldose to its corresponding aldaric acid derivative, the ends of the chain become identical Such an operation will disclose any latent symmetry in the remaining molecule and possibly form an achiral meso compound
Alditols optical activity - Big Chemical Encyclopedia It was known that aldoses could be reduced to alditols, and could be oxidized to the monocarboxylic aldonic acids and to the dicarboxylic aldaric acids A theory of stereoisomerism and optical activity had been proposed (1874) by van t Hoff and Le Bel
L3_Chapter20_PracticeProblems1 - UC Santa Barbara Compounds A and B are reduced to identical alditol, but form enantiomeric aldopentoses after Wohl degradation Compounds B and C form the same aldopentose after Wohl degradation, but reduced to different alditols
25. 6 Reactions of Monosaccharides - Organic Chemistry | OpenStax If warm, dilute HNO 3 (nitric acid) is used as the oxidizing agent, an aldose is oxidized to a dicarboxylic acid called an aldaric acid Both the aldehyde carbonyl and the terminal –CH 2 OH group are oxidized in this reaction
15. 6: The Oxidation-Reduction Reactions of Monosaccharides Sodium borohydride reduction of an aldose makes the ends of the resulting alditol chain identical, HOCH 2 (CHOH) n CH 2 OH, thereby accomplishing the same configurational change produced by oxidation to an aldaric acid