247 



From amongst reprcsentatives of the cuinarophenazine group 

 we hâve studied this time the prciduct of distillation of the baryum 

 sait of the sulphonic acid of o-hydrcxv-phenyl-hvdroxy-chioro- 

 chinoxaline. The latter has been obtained bv condensing chloro-o-phe- 

 nylenediamine with hydroxybenzoyl formic acid. 



The réaction of p-methyl-o-amino-diphenyl-amine with isatin 

 takes place quite in accordance with former expériences, viz. isatin 

 behaves in this case like an o-hydroxyketon vielding an alkylated 

 azine and not an ammonium base: 



HN,- 



\-/\ 



-CO 



I + 



G. OH HN 



2H2 0-h 



-c "x/- 



N 



C 



Go H, 

 I 

 CH, 



N 



Cg H^ 



I 

 CH, 



We dont consider the above resuit by any means as a proof 

 for the hydroxyl-formula for isatin, on the contrarv we think it 

 highly probable, that the above réaction takes place in two stages 

 producing first an imesatin, containing a hydroxyl group. which 

 is split off afterwards with the hydrogen atom of the secondary 

 aminé group to close the azine ring. 



The behaviour of isatin towards hvdroxylamine has been 

 studied on several occasions before. it remains however stiil unde- 

 eided by which formula to express the coastitution of the ethers 

 of isatinoxime. 



These ethers may be obtained according to Baeyer's method 

 by the action of alkylhaloids on the silver sait of the oxime and, 

 lead by analogy. one of the foUowing formulas may appear ac- 

 ceptable: 



-C = NOR 



j 



C.OH 



N 



In (jther words it is supposed. that the .silyer sait of isatin- 

 oxime ccmtains the silver atom attached to oxygen, and being sub- 



