Constitution of the Diazoamido- Compounds. 

 j :; \) 6 H 4 .N0 8 (p), 



523 



N:N, 



( P )N0 2 .C 6 H 4 



C 6 H 4 .N0 2 (p). 



C 9 TL 



Now the ethyl-derivative (No. 5 in the table) is prepared 

 by the direct ethyl ation of the compound itself, and also by 

 the action of diazotized jp-nitr aniline upon p-ethyhiitr aniline. 

 Analogy would therefore lead us to suppose that if the ethyl- 

 derivative had the above constitution, the other ethyl-deriva- 

 tives, prepared by the action of diazotized p-nitramline upon 

 m-ethylnitraniline (m.p. 187°) and of diazotized m-nitraniline 

 upon p-ethylnitraniline (m.p. 174°-175°), would have a similar 

 constitution : — 1 



N:K 



(p) N0 2 . C 6 H 4 C J C 6 H 4 . N0 2 (m) , 



(m)N0 2 .C 6 H 4 



N 

 C 2 H. 



C 6 H 4 .N0 2 (p) 



But these two formulae are identical with one another and 

 with that of the ethyl-derivative of m.p. 148°, whereas their 

 melting-points and mode of decomposition show most con- 

 clusively that the three compounds are isomeric and not 

 identical. It must, therefore, be concluded that the formula 

 now proposed does not apply to the normal compounds, and 

 the suggestion at once arises whether these may not be the 



2N2 



