180 Certain New Derivatives in the Ai'omatic Series. 



brightoess and stability. The results are given in detail in Part 

 Second of the thesis. 



II. Another hold on the subject was suggested to the writer on 

 noticing the composition of leuk-Auramine, 



CH ^ NH, 



(C,H-N(CH3), 



That this compound was diazotizable was readily seen ; and that if 

 it would link with the naphtols, naphtylamines, and their sulphonic 

 acids, it would give dyes with the unique characteristic of being 

 the first dye which had been made where the diphenyl-methane 

 group was linked with naphtols. Success was attained in the 

 coupling, and colors were made which possessed many desirable 

 properties. The detailed work of the experiments are given in the 

 technical part of the thesis. 



III. For increasing the complexity of the molecule, it was deter- 

 mined to use dinaphtols in lieu of the ordinary naphtols ; this in- 

 creased the molecular weight of the dyes made, and although it is 

 early to predict marked success, it is to be said that the colors dyed 

 from the dinaphtols are resisting the action of light to a remarkable 

 degree. 



lY. Chinoline offered another chemical as a proper subject for in- 

 vestigation, as it had a polycyclical formation, was of considerable 

 molecular weight, and aniido groups could be put into the molecule. 





When changed to a nitro derivative, and then reduced to the 

 amido form, and subsequently diazotized and coupled with naphtol 

 or naphtylamine, sulphonic acids, several new compounds with the 

 desired characteristics were obtained. 



V. It had long been noticed by the writer that the Schcellkopf's 

 acid, Cj(,Hj.0H(S0.,H)2, 1:4:8, gave staunch azo dyes. Those 

 which are already commercial articles are — 



Wool Scarlet B, where xylidine is diazotized and linked with the 

 Schcellkopf's acid. 



Croceine SB, which uses amido-azo-toluol. 



