Ryan and Walsh — Studies in the Diflavone Group. 197 



A solution of the substance in concentrated sulphuric acid has a deep red 

 colour. 



The constitution of the substance being very similar to that generally 

 assumed for dimethyl-curcumin, it was considered desirable to examine its 

 behaviour towards unmordanted and mordanted fabrics. The substance gave 

 no tinctorial effect with unmordanted wool. With wool mordanted with 

 aluminium chloride and stannous chloride, the following results were 

 obtained : — 



Mordant. Alum. Tin Salt. 



Tint. Pale lemon. Pale canary. 



The tints for curcumin are : — 



Orange Yellow. Orange Eed. 



It is thus seen that the tinctorial effects of diveratrylidene-diacetores- 

 orcinol on mordanted wool are very slight in comparison with those obtained 

 with curcumin. 



(3) Diveratrylideiie-Diacetoresorcinol Diacetate. 



A mixture of 1 gram of diveratrylidene-diacetoresorcinol, 1 gram of 

 anhydrous sodium acetate, and 10 c.cs. of acetic anhydride was heated to 

 vigorous boiling on a sand-bath, and then allowed to cool. Cold water was 

 added, and the mixture was left, with occasional shaking, for a short time. 

 The aqueous layer was decanted, the residual oil was well shaken with a 

 solution of sodium bicarbonate, and then extracted with chloroform, and 

 finally mixed with absolute alcohol. After several recrystallizations from 

 chloroform and alcohol, the diacetate melted at 155-157° 0., and gave on 

 analysis the following results : — 



0-1080 substance gave 0-2644 C0 2 and 0-0496 H 3 0, 



corresponding to C 66 - 76, H 5 - l, 



C 32 H 30 O lo requires C 66-87, H 5-26. 



It crystallizes from chloroform and alcohol in slender yellow prisms, 

 which are slightly soluble in carbon disulphide, alcohol, or ether, soluble in 

 benzene, and readily soluble in chloroform. 



Its alcoholic solution gives no coloration with ferric chloride. A solution 

 of the substance in concentrated sulphuric acid has a deep red colour. 



(4) Biveratrylidene-Diacetoresorcinol Diacetate, Tetabromide. 



After addition of a chloroform solution of - 6 gram of bromine to a 

 solution of 1 gram of diveratrylidene-diacetoresorcinol diacetate in the least 

 possible quantity of dry chloroform, the colour of the bromine disappeared 



