Barium D-gulonate

Barbituric acid, 32, 7 Barium D-gulonate, 36, 39 Behenic acid, 37, 69 Beilstein test, 34, 38 Benzaldehyde, 30, 100 33, 70 34, 65 Benzaldehyde, p-AMINO, 31, 6 />-DIMETHYLAMINO-, 33, 27 Benzaldehyde, purification of, 33, 71 Benzalmalonic acid, ethyl ester, 37, S 4-Benzal-2-phenyl-5-oxazolone, 37, S Benzamidine, N,N -diphenyl-, 31, 48 N-phenyl-, 36, 64 Benzanilide, 31, 48... 

By treatment of D-gulose (XVII) or D-idose (XVIII) with warm aqueous barium hydroxide solution Van Ekenstein and Blanksma were able to isolate D-sorbose (II) with a melting point of 165° and [< ]d + 42.9° in water. The aldoses were prepared from D-gulonic and D-idonic lactones obtained by the cyanohydrin synthesis from D-xylose. 

Everett and coworkers have done extensive work on this overoxidation of aldoses with bromine at 25° for long periods of time (forty to fifty days). Under these conditions, appreciable amounts of the keto acids are obtained. Hart and Everett obtained 5-keto aldonic acids from D-glucose, D-mannose, D-galactose, D-xylose and D-gulonic lactone. The barium salts were isolated and converted to the brucine salts. The structure of the oxidation product from D-xylose was not determined. The stability of these keto acids to further bromine oxidation had been noted earlier by Kiliani. ... 

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