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



It contains water of crystallization, which it loses on being 

 heated to 150°. 



O'iSio grm. barium isoanthraflavate dried at 150° gave 

 0*1104 grm. BaSO^, or 35'86 p. c. of barium^ and 0*1146 

 grm.,or63-3i p.c.isoanthraflavine. The formula Cj^HgBaO^ 

 requires 36*53 p. c. Ba, and 64*00 p. c. isoanthraflavine. 



The derivatives of isoanthraflavine, as far as we have ex- 

 amined them, closely resemble those of anthraflavine. 



Tetrabromisoanthraflavine, Cj^H^Br^^O^. — This com- 

 pound was prepared in the same way as tetrabromanthra- 

 flavine. It crystallizes in /ellow needles, which are easily 

 soluble in glacial acetic acid, but dissolve with difficulty 

 in boiling alcohol. Analysis gave the following results : — 



I. 0*3712 grm. of substance dried at 150° gave 0*4086 

 grm. CO2, and 0*0396 grm. ^Jd. 



II. 0*1736 grm. of substance gave 0*2344 grm. AgBr. 



Theory. I. II. 



Ci4 168 30-22 30-02 



H^ 4 0-72 1-18 



Br, ■.... 320 57-55 57-45 



.0, 64 11-51 



556 lOQ-OO 



Diacetylisoanthraflavine, Ci^Hg (C^HjO) ^O^^. — Isoanthra- 

 flavine and acetic anhydride, heated together, at i6o°-i8o° 

 yield a product crystallizing in light yellow microscopic 

 needles, soluble in alcohol and easily soluble in glacial 

 acetic acid. The substance commences to soften at 175°, 

 and melts completely at about 195°. It is decomposed by 

 alcoholic potash solution. That it contains 2 molecules of 

 acetyl was proved by the following determination of the 

 quantity of isoanthraflavine obtained by decomposition with 

 alcoholic potash. 



