54 Proceedings of the Royal Irish Academy. 



sodium acetate, and 10 c.e. of acetic anhydride was heated to boiling on a 

 sand-bath, cooled, and poured into water. After standing for some time the 

 aqueous layer was decanted. The residual oil was dissolved in ether, the 

 solution was washed with dilute sodium carbonate, and the ether was 

 evaporated. The oily acetate was dissolved in dry chloroform, and to the 

 solution 0-8 gram of bromine was added. The mixture was let stand in a 

 stoppered flask until the colour of the bromine had disappeared, the chloro- 

 form was then evaporated, and the colourless crystalline residue was 

 recrystallised from boiling toluene. When dried at 1 1 D C. it melted at 

 176-178°, and gave on analysis the following results : — 



0-1621 substance treated with sodium and alcohol required 



X 

 8-3 c.e. — AgX0 3 to completely precipitate the sodium bromide, 



corresponding to Br 40-92, 



C..H :: Br 4 6 requires Br 41-31. 



It crystallises from boiling toluene in long colourless needles which are 

 sparingly soluble in the ordinary organic solvents. 



Diflavoru. 



After addition of 05 gram of the tetrabrouiide of dihydroxy-dichalkone- 

 diacetate to 7S c.e. of semi-normal alcoholic potash, the tetrabroruide dis- 

 solved rapidly to a solution, the colour of which changed quickly from 

 yellow to red. Potassium bromide was precipitated, and after warming for 

 a short time on the water-bath a copious separation of felted needles ensued. 

 The crystals were filtered, washed with water and alcohol, dried, and 

 recrystallised from boiling toluene. 



"When dried at 105° C. it softened at 27 T ' : C. and melted to a brownish 

 liquid at 277— 278°G. It gave on analysis the following results : — 

 0-1537 substance gave 04558 C0 2 and 00537 H.O. 

 corresponding to C 7S33 H 38 

 C« H„ O, requires C 7S-66 H 3-85. 



It crystallises from toluene in faint yellow needles which are scarcely 

 soluble in petroleum ether, alcohol, or ether, soluble in carbon disulphide, and 

 readily soluble in chloroform. It is insoluble in water or dilute aqueous 

 potash. In boiling alcohol it is sparingly soluble, and the solution gives no 

 coloration with ferric choloride. The presence of dibenzylidene-dicoumaranone 

 in the product was indicated by the fact that the crystals were turned orange 



