Arabinonic acid, 2-deoxy

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. 

There are three known metabolic pathways to 3-deoxyulosonic acids. In the first, aldonic acids, formed by oxidation of aldopyranoses to the corresponding lactones, are dehydrated to the ulosonic acids (see Fig. 6). Thus, D-arabinose is converted by way of D-arabinonic acid to 3-deoxy-o-ffZj/cero-pentulosonic acid. The latter is then subjected to oxidative cleavage, yielding pyruvic and glycolic acids. L-Arabinose is oxidized and dehydrated to the 3-deoxy-L-g Z2/cero-pentulosonic acid, which is further oxidized to... 

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... 

Amyloses, 273, 283, 306, 310, 340, 341 Aniline, p-bromo-, 112 Anthranilic acid, 155 Arabinitol, 2-amino-2-deoxy-n-, 60 Arabinonic acid, 2,3,5-tri-O-methyl-D-, amide, 195... 

Weygand and Bergmann investigated the oxidation of certain derivatives (known as Amadori products) of l-amino-l-deoxy-n-fructose. The oxidation of 1-deoxy-l-p-toluidino-n-fructose in 2 V ammonium hydroxide at 50° in the presence of a platinum-on-carbon catalyst led to the degradation of the compound to n-arabinonic acid, presumably according to the following sequence. 

The oxidation of the enolized Amadori compound yields D-arabinonic acid and JV-fonnyl-p-toluidine. The latter is cleaved, and its formaldehyde residue, on further oxidation, gives carbon dioxide and formic acid. The oxidation of the 1-p-anisidino-l-deoxy- and 1-deoxy-l-p-phenetidino- derivatives of D-fructose jdelds D-arabinonic acid in the same way. 

M, iRAS)-form 2-Amino-2-deoxy-L-arabinonic acid... 

Amino-2-deoxy-D-arabinonic acid, A-469 2-Amino-2-deoxy-L-arabinonic acid, A-469 2-Amino-2-deoxy-1,4-arabinonolactone, A-177... 

C-Allyl-l,6-anhydro-2-deoxyglucose p-D-Pyranose-ybrm, A-97 4- C-Allyl-1,6-anhydro-4-deoxy-2- O -tosyl- p-D-glucopyranose, A-98 2-Amino-2,3,5-trideoxy-3-methyl-L-arabinonic acid, A-427... 

Amino-5-0-carbamoyl-2-deoxy-L-xylonic acid, A-469 5-Amino-5-deoxy-D-arabino-l,5-lactam, T-177 2-Amino-2-deoxy-D-arabinonic acid, A-469 2-Amino-2-deoxy-L-arabinonic acid, A-469 2-Amino-2-deoxy-l,4-arabinonolactone D-form, A-177 2-Amino-2-deoxygluconic acid D-form-, Me ester, A-218... 

Derivatives of 5-amino-5-deoxy-L-arabinonic (58) and o-xylonic (59) acids were prepared from the respective per-O-methyl aldono-1,5-lactones (56 and 57). Opening of the lactone by alcoholysis followed by tosylation of... 

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