42 DRS. E. SCHUNCK AND H. ROEMER ON SOME 



mination made of the C and H we infer that its formula is 

 Cj^H^^ (NO 1)4.04, and, therefore, that it is a tetranitroan- 

 thraflavine. 



0*3 1 26 grm. of substance gave 0*4554 grm. COj and 

 0-0344 grm. Hj,0. 



Theory. Experiment. 



Cu 168 40-00 3973 



H^ 4 o'95 i'22 



N4 56 i3'33 



0,2 192 4572 



420 lOO'OO 



Nitroanthraflavine appears, therefore, to be isomeric with 

 nitrochrysazine, and, therefore, also with chrysammic acid, 

 which, according to Liebermann, is identical with nitro- 

 chrysazine. 



By treatment with tin and hydrochloric acid, nitroan- 

 thraflavine yields a dark blue powder, which is almost in- 

 soluble in alcohol and glacial acetic acid, but dissolves in 

 caustic alkali with a fine violet colour like that of an al- 

 kaline solution of alizarine. The solution on exposure to 

 the air soon assumes a brownish purple colour. 



Diacetylanthraflavine has already been described by 

 Perkin. We found its melting-point to be at 227°. 



Diethylanthraflavine, G^^(,{CJ1^J^^. — This compound 

 was prepared by heating a mixture of anthraflavine, caustic 

 soda, and iodide of ethyl, to which a little alcohol was 

 added, in sealed tubes to 120°, and crystallizing the pro- 

 duct from boiling alcohol. It crystallizes in light-yellow 

 needles, which are soluble in benzol and glacial acetic acid, 

 but insoluble in water. It melts at 232°. The fused sub- 

 stance on again solidifying is converted into a mass of 

 prismatic crystals. Diethylanthraflavine dissolves without 

 change in concentrated sulphuric acid, forming a red so- 

 lution, the spectrum of which shows a well-defined absorp- 



