Certain Neio Derivatives in the AromaMc Series. 179 



Ghrijsamine G., made with benzidine and salicylic acid. 



Diamine Black, benzidine and amido-naphtol-sulphonic acid. 



Diamine Fast Red, made from benzidine and amidonaphtolsul- 

 phonic acid with salicylic acid. 



Diamine Red NO, manufactured from ethoxybenzidine and naph- 

 tylamine sulphonic acid. 



Diamine Blue 3R, from ethoxybenzidine and alphaXaphtol-sul- 

 phonic acid. 



C6H3.CH3.NH, 



b. Tolidine, | is used for a number of good colors — 



C,H,CH,NH, 

 reds, yellows, oranges, and pinks. 



Benzojnirpurine 4:B, made from diazotized tolidine and naph- 

 thionic acid. 



Benzopur purine B, from tolidine and naphtylamine-sulphonic 

 acid, 2 : 6. 



Chri/samine R, from benzidine and salicylic acid. 



Toluylene Orange, from tolidine and toluylendiaminsulphonic 

 acid. 



Rosazmnne B, from tolidine and methyl-naphtylamine-sulphonic 

 acid. 



c. And there are a number of dyes, blues and reds, made from 

 dianisidine, which hold a firm place in the commercial world. Di- 



C,,H,O.C6H3.NH, 

 anisidine is, " | and is used for 



C,H,O.C,H,NH, 

 Benzoazurine G, where the dianisidine is diazotized and coupled 

 with naphtolsulphonic acid, 1 : 4. 



Benzopur purine 105, dianisidine and naphthionic acid, 1 : 4. 



From an observation of the constitution of the benzidine, toli- 

 dine, and dianisidine, it becomes evident that the chemicals which 

 give the best results must have, first, the amido group ; second, as 

 much the polycyclical construction as possible ; and thirdly, should 

 have the highest possible molecular weight. 



I. The first chemical which was taken up in the course of these 

 researches, as a chemical possessing the desired properties, was 



Fluoren, I >CH, 



CeH/ 



As had been foreseen, fluoren gave several very interesting dyes, 

 all of which had the properties most sought for in good colors — 



