Ryan and O'Neill — Studies in the Diflavone Group. 

 we may derive compounds represented by the formulae : — 



49 



CO CO 



Diflavone. 



co co 



Diflavanone. 



Diflavonol. 



Diehromone. 



and which may be termed, provisionally, diflavone, diflavanone, diflavonol, 

 and diehromone respectively. 



We have so far attempted the preparation of two of these compounds, 

 and in the present communication we describe the syntheses of one of them. 



As parent substance we employed diacetoresorcinol, a compound which 

 Eijkman, Bergema, and Henrard (Chemisch Weekblad I, p. 453j obtained 

 from resorcinol diacetate. We converted the diacetoresorcinol into its 

 dime thy lether, and from the latter by interaction with benzaldehyde 

 we obtained the dimethylether of dihydroxy-dichalkone which reacted 

 with aluminium chloride to give dihydroxy-dichalkone. By acetylation 

 and bromination of the latter compound we prepared the diacetate of 

 dihydroxy-dichalkone-tetrabromide, which reacted with alcoholic potash 

 to give diflavone and some dibenzylidene-dicoumaranone : — 



CO- CHB r CHB r -C 6 H 5 



co co 



Diflavone. Dibenzylidene-dicoumaranone. 



[-a*] 



