REACTIONS AND IDENTIFICATION 379 Members of Class (iii) do not form quaternary salts. (M.ps., cf. methiodides and methopicrates, pp. 553-554.) (C) p-Nitroso derivatives. These derivatives are obtained only from Class (ii): for preparation, see p. 204. (M. ps., p. 553.) (D) No general reaction can be cited for the preparation of crystalline derivatives of Class (iii). Triphenylamine, when nitrated in acetic acid with fuming nitric acid, gives tn-p-nitrophenylamme, m.p. 280°. The presence of substituents in the phenyl groups may however com-plicate or invalidate nitration. Note. Tribenzylamine (C 6 H 5 CH 2 ) 3 N, b.p. 380-390°, can be identi-fied as indicated in (A) and (B). SPECIAL REACTION FOR QUINOLINE. Dissolve i drop of quinoline in i ml. of dil. HCl and add a few drops of a saturated solution of potassium dichromate. A copious orange-yellow precipitate of quinoline dichromate, (C 9 H 7 N) 21 H 2 Cr 2 O 7 , is formed; pyridine does not give a crystalline dichromate under these conditions. SPECIAL REACTIONS FOR
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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.