Download torrent Studies from the Rockefeller Institute for Medical Research Volume 38

Studies from the Rockefeller Institute for Medical Research Volume 38 by Rockefeller Institute Research

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...13 gm. of the first sample were taken up in 80 cc. of a 20 per cent solution of hydrochloric acid. 2 gm. of barium chloride and 2 gm. of stannous chloride were added. The solution was heated with reflux condenser 13 hours. The dark brown solution was filtered from melanin and diluted with an equal volume of water. The solution was freed from lead and tin by means of hydrogen sulfide and from barium by sulfuric acid. The solution was concentrated under diminished pressure nearly to dryness. The residue was taken up in methyl alcohol and allowed to stand. Typical crystals of glucosamine hydrochloride separated out. 0.020 gm. in the Van Slyke apparatus gave 2.23 cc. nitrogen at 25C. and 759.6 mm. pressure. Calculated for C4HiiO.N.HCl: Found: N 6.51 6.19 Initial. Equilibrium. a: = + 1-78X 2.0355 _ _ + 1.42 X 2.0355 = 1 JD IX 0.0405 1 JD 1X 0.0405 The substance began to turn brown at 200C. and turned black at 220C. It did not melt. Vol. xl, No. 10, pp. 1580-1590. ON NITRO-AND AMINOARYL ARSONIC ACIDS. By WALTER A. JACOBS, MICHAEL HEIDELBERGER, And IDA P. ROLF. (From the Laboratories of The Rockefeller Institute for Medical Research) (Received July 9,1918.) In the course of studies on the synthesis of organic arsenic compounds for therapeutic purposes it was found necessary to prepare a number of aminoaryl arsonic acids. It was therefore of importance to find methods which would furnish these substances in amounts sufficient for synthetic work. Of the methods available the application of the Bechamp synthesis, first used for the preparation of arsanilic acid, has rendered directly accessible only a limited number, mainly /-aminoaryl arsonic acids. In order to obtain o-and w-amino arsonic acids it has usually been necessary to employ indirect...

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