Manchester Memoirs, Vol. xlviii. (1904), No. 14. il 



and provides an easy representation of the hydrazine 

 formation 



C6H6N = N + 4H-^ 



\/ 

 CI 



C6H5N = N ->C6H5N-N = C1H 

 CI I H H„ 



The diazotisation process is written 



Ar. N = X + NO^H -^ Ar. N = X + 2H.A 



II I \/ ' 



H, H N 



the complex ion 



Ar N + H 



II 



being transformed into the ion 



Ar. N 



N 

 thus in the case of aniline we have 



CbHbN = CI + NO,H -^ CeHfiN = CI + 2 H,0 



II I \/ 



H, H N 



and sulphanilic acid 



/SO,. OH /S0,.0. 



C6H4 . < + NO„H -^ CeHX >\ + 2Hp. 



\nh, " ^nCJ^ 



The other reactions of diazonium salts, as well as those of 

 the phosphonium, arsonium, etc., compounds, are similarly 

 written. 



Municipal Technical School, 

 Bury, Lancashire. 



