REACTIONS AND IDENTIFICATION 373 (C) TERTIARY AMINES. R 3 N. The tertiary amines which the student is likely to encounter can be conveniently subdivided: (i) Aliphatic amines. Triethylamine, tri-n-propylamine, and tri-isopropylamine. (ii) Dialkylarylamines. Dimethylaniline, diethylaniline. (iii) Triarylamines. Triphenylamine. (iv) Heterocyclic amines. Pyridine, the picolines (i-, 2-, and 3-methylpyridine), quinoline, 2-methylquinoline (quinaldine), 4-methylquinoline (lepidine). (v) Special compounds, e.g., Hexamethylenetetramine. (A) PRIMARY AROMATIC AMINES. Physical properties. Majority are liquids except p-toluidine and i- and 2-naphthylamine. All are colourless when pure, but rapidly darken on exposure to air and light. All are very sparingly soluble in water, but dissolve readily in dilute mineral acids (except the naphthyl-amines, which are only moderately soluble in acids). They form colour-less crystalline salts (e.g., C 6 H 5 NH 21 HCl) which are soluble in water; these aqueous solutions usually have an acid reaction owing to hydro-
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.