256 



acid. The solution was heated on a boiling water bath for ' ., hour, 

 diluted with water and neutralised by adding a solution of sodium- 

 hydrate. The precipitate obtained we dissolved in conc. hydrochlo- 

 ric acid. diluted tbe solution by adding water. filtered oif some 

 undissolved substances and precipitated the ps-indophenazine deri- 

 vative by adding an alkali. This procédure has been repeated three 

 times and finally the N-tolyl- ps-indophenazine crystallised repea- 

 tedly from alcohol. We obtained glistening brownish red needles 

 melting at 255 — 255'5''. whieli were easily soluble in boiling alco- 

 hol, with greater difficulty in benzène and chloroform. The S(;lu- 

 tions in concentrated acids possess a yellow or reddish brown co- 

 lour, according to the concentration of them. 



Analysis: 



0.1089 gr. gave 13.1 ow' N (t = lO.S«, p = 738 mm) 

 0.1798 gr. gave 0.5359 gr CO., and 0.0826 gr. H,0 



calcul, for Cgi Hj5 Nj 

 13.61o/o 

 81.50''/„ 

 4.89o;„ 



The chlorhydride of the base may be obtained by passing 

 a current of hydrochloric acid through its solution in benzène. It 

 represents a yellow crystalline powder which dissociâtes very easily 

 giving ofif hydrochloric acid. 



Brg-N -tolyl-ps-indophenazine 



has been obtained from bromoisatin by a method analogous 

 to the foregoing one. It crystallises from alcohol in brownish red 

 needles melting at 290 — 291°, which dissolve easily in boiling al- 

 cohol, not so readily in benzène, chloroform and aceton and with 

 difficulty in ether. 



Analysis: 



0.1091 gr. gave 10.6 cm^ N (t = 14.50. p = 742 mm) 



found 11.12»/„ N 



calcul, for C.i U^^ Nj Br 10.89 "U N 



In acids it dissolves like ail the hitherto examined derivatives 

 of ps-indophenazines with a yellow colour. 



