Read online or download a free book: A First Year Course Of Organic Chemistry For Technical Institutes: The Aliphatic Compounds
Publisher: RareBooksClub.com (6 Mar. 2012)
By: Albert Ernest Dunstan (Author)
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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. 1908 Excerpt: ...sulphuric acid. Warm gently for a few minutes, and pour into a test-tube full of water. A red coloration is produced. Make alkaline, and the colour changes to a fine blue. Since the nitrosamines are susceptible to hydrolysis regenerating the original amine, this forms a convenient method by which secondary amines may be obtained from a mixture of amines. Neither the tertiary nor quaternary amine forms nitroso compounds, and we have seen that primary amines are converted by nitrous acid into alcohols. Expt. 52.--Identification of an amine. Distil the amine or its salt with strong potash solution, and collect the distillate in water. Notice the alkaline reaction and characteristic smell: lower amines smell fishy. Test with nitrite and dilute sulphuric acid: distil off the alcohol or the nitrosamine. Test with chloroform and potash, forming an isocyanide in the case of a primary amine. Prepare the platinichloride, and determine the molecular weight of the amine, or from a large amount of substance distil and collect the free amine. Titrate this with normal hydrochloric acid (methyl orange as indicator), evaporate the resulting neutral product to dryness, dry in a steam-oven, aud weigh the solid hydrochloride, when--Weight of hydrochloride _ Mol. wt. of amine hydrochloride Weight of HC1 used Mol. wt. of HC1' The quaternary ammonium compounds are remarkably stable. Tetra-methyl-ammonium-iodide, for example, a white solid crystalline body, is unaffected by caustic potash: but in the presence of silver oxide it is converted into a strongly alkaline liquid, and a residue of silver iodide remains: N(CH3)4I + Ag.OH N(CH3)4.OH+AgI. This caustic liquid contains tetra-methyl-ammonium-hydroxide, N(CH3)4OH, which behaves very similarly to caustic potash, but is so much st...
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