Mr. Mills on Bromphenylamine and Chlorphenylamine. 73 



is not further acted upon by either iodide of ethyle or methyle. 

 With acids it forms a series of salts which are remarkable for the 

 beauty with which they crystallize. The platinum-salt is almost in- 

 soluble in water, but soluble with difficulty in concentrated boiling 

 hydrochloric acid, crystallizing from this solution on cooling in 

 beautiful needles. This salt contains 



C 22 H 34 N 2 Cl 2 ,2PtCl 2 . 



The above experiments appear to establish the molecular construction 

 of benzidine in a satisfactory manner. This base is obviously a 

 primary diamine, in which the molecular group C 12 H 8 , whatever its 

 nature may be, functions as a diatomic radical. A glance at the 

 subjoined Table exhibits the construction of benzidine and of the 

 several compounds which I have described. 



Diamines. 



(C 12 H 8 )" 



Benzidine H 2 >N, 



H 2 



( H 2 ) 2 J 



Tetrethylated (C 10 H 8 )"i 



benzidine.... (C 2 - H 6 ) 2 I N q . 

 (C 2 H 5 )J 



Iodides of Biammoniums. 



Primary [(C 12 B 8 )" H 6 NJ'I 2 , 



Secondary .... [(C M H> H 4 (C 2 H 5 ) 2 N 2 ]" h, 



Tertiary [(C 1Q H 8 )" H Q (C 2 H 5 ) 4 N 2 ]" l" 2 , 



Quartary [(C 12 H s )" (CH,") 2 (C 2 IL) 4 N 2 ]" I 2 , 



" On Bromphenylamine and Chlorphenylamine." By E. T. Mills. 

 Received July 24, 1860. 



Nitrophenylamine, when prepared from dinitrobenzol (i. e. by the 

 indirect method), differs in so many respects from the isomeric base 

 which is obtained from phenyle-compounds (i. e. by the direct method), 

 that chemists have distinguished these two bodies as alpha- and 

 beta-nitrophenylamine * — Bromphenylamine and chlorphenylamine 



* The alpha-nitrophenylamine (nitraniline) -was forrr.ed about sixteen years ago 

 by Dr. Muspratt and myself (Cliern. Soe. Mem. vol. iii. p. 112), by the action of 

 reducing agents on dinitrobenzol. The beta-nitraniline was discovered by Arppe 

 (Chem. Soc. vol. viii. p. 175), who obtained this compound when distilling pyro- 

 tartronitrophenylamide with potash. The two bases resemble each other in a 

 remarkable manner; but there are differences in their physical and chemical 

 characters which leave no doubt as to the fact of their having different constitu- 

 tions. I may here remark that 1 have repeated Arppe's experiments, the results 

 of which I can confirm in every particular. Since the pbenyle-compound from 

 which Arppe obtained his substance is accessible only with difficulty, I have 

 endeavoured to nitronate a more easily procurable phenyle-compound.' Acetvl- 



