Certain New DeiHvatives in the Aromatic Series. 185 



This can be reduced by the action of sodium-amalgam, or indeed 

 any reducing agent, to the form of Leuk-Auramine, 



(C,H-N(CH,), 



(C,H-N(CH3), 



If three kilos of the Auramlne has been taken in the beginning 

 of the operations, seven hundred grammes of sodic nitrite should 

 be employed in the diazotization, with twelve hundred grammes of 

 hydrochloric acid of twenty Baume. The reaction is complete in 

 the course of half an hour, when the coupling is proceeded with. 

 It should be noted that it is not necessary in this reaction to isolate 

 the diamido product in the dry or solid state ; the coupling with 

 the desired naphtol can be efTected just as well in the same solution 

 where the reduction has taken place. In the instance of naphtyl- 

 amine-sulphonic acid, 3.22 kilos are taken. Coupling is facilitated 

 by stirring and by heating the liquid to about eighty degrees Centi- 

 grade. The dye is precipitated by the addition of sodic acetate and 

 common salt. Then it is filtered out, pressed, dried, and analysed. 

 In the case of naphtylamine-sulphonic acid, the dye is proved to 

 have the constitution, 



(C,H-N(CH3)3 



^^N N-c,; 



(C«H-N(CH3), 



Other compounds can be linked, as is shown in the table which 

 is appended. 



Naphtylamine-sulphonic acid, Bronner's, 2 : 6, Red. 

 Naphtylamine-sulphonic acid, Dahl's, 2 : 5, Red, Sample No. 22. 

 Naphtylamine-sulphonic acid, Bayer's, 2 : T, Brown. 

 Naphtylamine-sulphonic acid, mixture of 



2 and 5, Red, Sample No. 23. 



alpha-Naphtol, Orange. 



Naphtol-sulphonic acid, N. and W., 1 : 4, . Rose. 

 Naphtol-sulphonic acid, Schieffer's, 2:6, . Brown. 

 Naphtol-disulphonic acid, 2:6:8, " Gr", . Orange, bright. 

 Naphtol-disulphonic acid, 2:3: 6, " R", . Orange, dull. 



III. The third line of working, employed in the thesis commenced 

 with the naphtols, and employed the di-naphtols, as they have a 

 higher molecular weight. 



The naphtols, both alpha and beta, are used in the manufacture 



CH i N N— C;„H..NH,.S03Na 



