Arabinonic acid, formation

The selectivity was enhanced by adding small amounts of anthraquinone-2-sulfonate (A2S), which decreased the formation of deoxy by-products. Thus, by adding 260 ppm of A2S with respect to arabinonic acid the selectivity to deoxy-products decreased from 4.2 to 1.6%. A2S acted as a permanent surface modifier since the catalyst was recycled with the same selectivity without further addition of A2S. The highest selectivity to arabitol was 98.9% at 98% conversion, with a reaction rate of 73 mmol h 1 gRU 1 at 80 °C. 

Fig. 8-18. Oxidative stabilization of cellulose through formation of aldonic acid end groups. R is cellulose chain. After oxidative formation of a glucosone intermediate this undergoes a benzilic acid rearrangement strongly favoring formation of mannonic acid end groups (2). In addition, cleavage of C-1 to C-2 and C-2 to C-3 bonds gives rise to the formation of arabinonic acid (3) and erythronic acid (4) end groups. (In this simplified scheme only the main products are shown.)...

Aiabinofuranose, 3,6 -di - 0 - (methoxy-carbonyl)- ,-, 1,2-carbonate, 108 Arabinogalactan, 73, 74 fractional precipitation of, 55 purification of, 56 Arabinonic acid, D-, formation of 3-deoxy-D-oro5fno-heptu-losonic acid 7-phosphate from, 253 Arabinopyranoside, bis (methyl 3,4-0-isopropylidene - /3 - n -, 2,2 - carbonate, 118, 132 2,2 -thionooarbonate, 132, 133 —, methyl 3,4-0-isopropylidene-/J-n-, 118, 119... 

Treatment of o-fructose 6-phosphate with oxygen and alkali resulted in loss of C-1 and the formation of D-arabinonic acid 5-phosphate. ... 

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