This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...dissolved in a saturated aqueous solution of barium hydroxide and heated for several hours at ioo. The alkylamines were removed by evaporation of the liquid at 40715 mm., and the barium hydroxide by precipitation with carbon dioxide and subsequent filtration. The filtrate was evaporated to dryness. The residue ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...dissolved in a saturated aqueous solution of barium hydroxide and heated for several hours at ioo. The alkylamines were removed by evaporation of the liquid at 40715 mm., and the barium hydroxide by precipitation with carbon dioxide and subsequent filtration. The filtrate was evaporated to dryness. The residue contained some undecomposed dimethylaminomethylglucoside, and would not crystallise. It was therefore re-methylated, a mixture of a-and /3-tetramethylmethylglucosides, (VIII.), being obtained, the dimethylaminomethylglucoside remaining in the silver residues. The de-methylation of (VIII.) to (IX.) was.carried out by heating with 7 per cent, methyl alcohol solution of hydrogen chloride, and that of (IX.) to (X.) by heating to 90 with 43 per cent, hydrogen iodide solution. Another aminoglucose differing in properties from glucosamine has been obtained by Fischer and Zach.1 By the action of liquid ammonia upon triacetylmethylglucoside bromohydrin cf. p. 84) at ordinary temperature, replacement of bromine by the amino group is effected and at the same time the acetyl groups are removed in the form of acetamide, with production of the hydrobromide of the base, aminomethylglucoside, C7H15O6N. This base does not itself reduce Fehling's solution, 1 Ber., 1911, 44, 132. but on hydrolysis with boiling dilute hydrochloric acid yields the hydrochloride of an aminoglucose, which has strong reducing properties. /-Glucose. Leevoglucose has not yet been found free in nature and has only been prepared by the reduction of /-gluconic lactone with sodium amalgam in weakly acid solution.1 By repeated crystallisation from hot methylic alcohol solution, Fischer obtained it in the form of anhydrous warty masses, melting at 141 to 143, having a sweet taste, and being easily s...
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