A method for the identification of pure organic compounds by a systematic analytical procedure based on physical properties and chemical reactions Volume 3 - Brossura
Sinossi
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. 1910 Excerpt: ...confirmatory tests: provided that the species has been correctly located in the tables by aid of the generic, divisional, coordinating, and special tests; that its constitutional name is known and stated in the third tabular column; that detailed procedures for the confirmatory tests are existent, or are specially elaborated in advanee of the experiment; and that the precautions emphasized in regard to the manipulation of small quantities on page 234, Volume I, are taken. To meet all these provisos is sometimes easy, but sometimes impossible without experimenting on a larger scale and converting the test into an extended organic chemical research. The real difficulties of the test are greatly lessened by the circumstance that the number of "first components " used in the manufacture of a majority of the present azo dyestuffs of commerce is not excessively large, and that simple special procedures for identifying most of them can be given. Thus in the list of less than four hundred chemically distinet azo dyestuff species of known constitution listed in the fourth edition of Schulta and Julius Tables, three hundred and twelve species have as their "first components" t a list of aromatic amines comprising only thirteen members. The number of times which each of these thirteen first components occurs in this list of colors is as follows:--benzidine, 67; o-tolidine, 40; dianisidine, 29; sulphanilic acid, 26; p-phenylene-diamine, 25; aniline, 22; naphthionic acid, 17; a-naphthylamine, 17; p-nitraniline, 12; o-toluidine, 13; 4-diaminonaphthalene, 12; xylidine, 11; 3-methyl-3,4-diaminobenzene, 11; diaminostilbenedisulphonic acid, 10. The separation and identification of reduction products which pass into the alkaline filtrate from a precipitate...
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