Articoli correlati a A method for the identification of pure organic compounds...
A method for the identification of pure organic compounds by a systematic analytical procedure based on physical properties and chemical reactions Volume Ń‚. 2 - 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. 1916 Excerpt: ...acid, asparagine, benzamide, benzonitrile, biuret, butyronitrile, cyanacetamide, guanidine carbonate, naphthonitrile, oxamidc, parabanic acid, phthalimide, propionitrile, propionamide, succinimide, sulphocarbamide, tolunitrile, p-tolenylimidoether, urea, and urethane. In case it is desired to remove all traces of ammonia in combination as ammonium salts from a mixture before subjecting it to drastic alkaline hydrolysis, as in T. 2.7 and T. 2.26, such ammonia may be most safely expelled by applying the lime and vacuum distillation treatment described by van Slyke (J. Biol. Chem., 10 (1911), 20). 2.9. Use of Benzenesulphonyl Chloride in Identification and Separation of Primary, Secondary and Tertiary Amines. When a primary amine is shaken with an excess of potassium hydroxide solution and benzenesulphonyl chloride, the reaction R.NH2 + C»H6.S02C1 + 2 KOH = R.NK.S02.C„H6 + 2 H20 + KCl frequently takes place, and a solution of the water-soluble potassium salt of a benzenesulphonamide is formed. Under the same circumstances secondary amines react generally according to the equation, R2NH + CHsSOsCl + KOH = R2N.S02.C6H6 + H20 + KCl, giving a secondary water-insoluble sulphonamide. The free sulphonamide from the primary amine may be precipitated from its alkaline solution by acidification with a mineral acid. The sulphonamides when purified by crystallization are often characteristic derivatives with good melting-points. Tertiary amines do not usually react with benzenesulphonyl chloride. Feebly basic aryl amines, like diphenylamine, and acid amides and nitroamines, also, do not react. The benzenesulphonamides from either primary or secondary amines may be hydrclyzed so as to enable recovery of the original amines by heating in sealed tubes with concent...
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