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By Michael Heidelberger

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0-Nitrophenylarsonic acid is a strong acid, and is not liberated by a slight excess of acetic acid, so that in order to obtain the free acid the deep yellow filtrate must be treated with hydrochloric or sulfuric acid until strongly acid to Congo red. After chilling thoroughly and letting stand 55 g. of o-nitrophenylarsonic acid are obtained as a heavy, pale yellow powder. Recrystallized'from water it forms pale yellow, glistening, hexagonal plates containing one molecule 01 water of crystallization.

Chetn. Soc. 7 ing the addition of ammonia until the solution remains definitely alkaline to litmus after shaking and boiling". The mixture is boiled 5 minutes, making certain that the reaction remains alkaline, and is filtered hot through a large Buchner funnel which, with the suction flask, has previously been warmed to prevent cracking. The precipitate of iron hydroxides is washed with a little hot dilute ammonia solution and the filtrate concentrated in vacuo until the ammonium salt filtrate of the amino acid begins to separate owing to the salting-out action of the ammonium sulfate present.

Soc 39, 1439 (1917) "Kolshorn, Ber. 37, 2483 (1904), and Rosenmund, Ber. 46, 1046 (1913), give 147°. " 7 Many of the modifications of the method have been applied on an enormous scale industrially, as m the hardening of fats with the aid of reduced nickel. 9 40 g. of quinine CHCH:CH2 CH fl O are dissolved in 180 g. of 10 per cent aqueous sulfuric acid, filtered, and treated with 8 to 10 cc. of a 2 per cent solution of palladious chloride 10 prepared by dissolving the salt m a little hot 1: 1 hydrochloric acid, concentrating as far as possible on the water bath, and diluting to volume with water.

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