218 REPORT— 1901. 



Indophenols. By Otto Witt. 

 Phenol blue (indo-aniline) — 



/C6H,.N(CH3)2 



is produced by the oxidation of amidodimethylaniline with phenol. 

 Its analogue, o-naphthol blue, 



/C6H4.N(CH8)2 



\ 



CioHigO 



is prepared by means of naphthol. Such compounds exchange N(CH3)2 

 for OH when boiled with a solution of NaOH ; thus, from phenol blue 

 there results indophenol (quinonephenolimide) 



/CeH^.OH 



a phenolic dye which dissolves in alcohol to a red and in alkali to a blue 

 solution. 



It may be obtained also by the action of phenol upon quinone chlori- 

 mide. 



/O /O 



^NCl \N-0,H,OH 



/CgH,.OH 

 _N/ +HC1 



^ ^CH^.O 



It may be obtained also by the oxidation of ;)-amidopheno] with 

 phenol. Its leuco-compound is^j-dihydroxydiphenylamine, NH(C|;Hi.0H)2, 

 a substance which unites in itself the properties of diphenylamine and 

 a diatomic phenol. 



Sur la hi des auxochromes. By M, P. Lemoult.^ 



In a recent note MM. Camichel and Bayrac having expressed the 

 opinion that the law of auxochromes has no further application to the 

 compounds of triphenylmethanethantothe indophenols, the author believes 

 that this statement is not sufficiently justified, having regard to hia 

 observations on four different colouring matters, namely : — 



First group (with 2 "I No. 1. Oxalate of tetramethyldiamidotriphenyl carbinol. 



tertiary nitrogens) J No. 2. Sulphate of tetrethyldiamidotriphenyl carbiaol. 



„ , /- -fi Q 1 No. 3. Chlorhydrate of hexethyltriamidotriphenyl carbinol. 



becona group (.witiid \-^q^^^ Dimethyldiethyldibenzyltriamidotriphenyl carbinol 



tertiary nitrogens; J sodium disulphonate. 



• Comptes Rendus, cxxxii. p. 784, March 25, 1901. 



