D-Arabinaric acid

FIGURE 1.5 D-Arabinaric acid (7), D-ribaric acid (8), D-xylaric acid (9), D-glucaric acid (10), L-glucaric acid (11). 

Among the first systematic studies on the electrolytic oxidation of n-glucose and certain other carbohydrates may be mentioned work by Loeb and Neuberg and coworkers. In experiments on the electrooxidation of D-glucose in solution in 5 aqueous sulfuric acid, using a lead anode, a temperature of <16°, and a platinum cathode, Loeb obtained, on the one hand, oxidation products (n-arabinonic acid and D-glucaric acid), and, on the other hand, fragmentation products (d-arabinose and formaldehyde) which were further oxidized to o-arab-inonic acid and n-arabinaric acid, and formic acid, respectively. 

Pentaric acids (sometimes known as hydroxyglutaric) ribaric (meso), xylaric (meso), and D- and L-arabinaric (d- and L-lyxaric). 

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