Studies; Reprints Volume 32

Studies; Reprints Volume 32

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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. 1920 edition. Excerpt: ... sparingly soluble in cold water, alcohol, or acetic acid, but is appreciably soluble in these solvents on boiling. 2-Amino-4-methylphenylarsonic Acid (4-Methyl-6-aminophenylan sonic Acid).--14.5 g. of 2-nitro-4-methylphenylarsonic acid was reduced with 120 g. of ferrous sulfate. The acidified filtrate was treated with barium chloride as in the case of 0-arsanilic acid and the filtrate made slightly alkaline and concentrated to small bulk in vacuo. The insoluble sodium chloride was filtered off and the amino acid precipitated by the careful addition of hydrochloric acid. The yield was 10 grams. Recrystallized from a small volume of hot water the amino acid forms colorless needles which melt at 180 with preliminary sintering and darkening. It is easily soluble in methyl or ethyl alcohol or glacial acetic acid and but sparingly in acetone or ether, and is appreciably soluble in water at room temperature. Its solution in dil. hydrochloric acid diazotizes smoothly and couples with R-salt to form a weak, orange-red dye as in the case of 0-arsanilic acid. 2-Nitro-6-methylphenylarsonic Acid (2-Methyl-6-nitrophenylarsonic Acid).--Twenty-two grams of 3-nitro-0-toluidine, 2,3-(H2N)(O2N) C6H3CH_, was diazotized and treated with sodium arsenite exactly as in the case of 3-nitro-4-toluidine. The yield of the resulting nitroarsonic acid was 19 grams. Recrystallized from hot water it sepa rates slowly as star-shaped aggregates of pale yellow, delicate needles which decompose at 228--30 with preliminary softening and darkening. It is sparingly soluble in hot water and practically insoluble in the cold, but is somewhat more soluble in boiling acetic acid and readily in hot alcohol. It dissolves in methyl alcohol at room tem more

Product details

  • Paperback | 172 pages
  • 189 x 246 x 9mm | 318g
  • United States
  • English
  • black & white illustrations
  • 1236929950
  • 9781236929952