320 Proceedings of the Roy at Irish Academy. 



with 80 c.c. of hydrobromic acid (s. g. 1'46) to 126° C. for two and a half 

 hours. The reaction product was poured into sodium bisulphite solution, 

 and a tarry mass was precipitated. The solution was extracted with 

 chloroform, and the chloroform solution was separated and dehydrated over 

 anhydrous calcium chloride. On evaporation of the chlorofoi'm, a somewhat 

 tarry amorphous solid was obtained. This was dissolved in absolute alcohol, 

 and the solution was evaporated to one quarter of its volume. A whitish 

 substance separated, which was crystallised from a mixture of chloroform and 

 alcohol. This substance crystallised in straw yellow needles, melting at 

 176°-177°C., and its faint yellow solution in sulphuric acid showed an 

 intense green fluorescence. A mixed melting-point of this substance with 

 dichromone, prepared from dimethoxy-isophtlialoyl-dipyruvic methyl ester, 

 was taken, and the melting-point of this mixture was the same as that of 

 either constituent. In other properties the two substances were also 

 identical. 



B. — Dibensyl-Biclvromone. 

 o o 



CH. CH Cf/'\/"N--''^C. CH^ C.Hg 

 6 5 2' I 11 



V\C 



CO 



Two grammes of di-a-phenylacetyl-aceto-resorcinol-dimethylether' were 

 heated with 40 c.c. of concentrated hydriodic acid (s. g. 1.7) to 135° C. for 

 seven hours. On pouring the reaction product into sodium bisulphite 

 solution, a brown precipitate was formed. The mixture was extracted with 

 chloroform, the chloroform layer was separated and dehydrated over 

 anhydrous calcium chloride. Filtration and evaporation of the chloroform 

 gave a bi'own tarry mass. This was washed a few times with petroleum 

 ether, and redissolved in chloroform. On adding to the chloroform solution 

 a mixture of ether and petroleum ether (3 volumes of ether to 1 volume of 

 petroleum ether) a dirty white solid was precipitated, which was filtered and 

 dried. This was crystallised a few times from alcohol, and finally from 

 benzene. On analysis it gave the following results : — 



0-2049 of the substance gave 0-5945 COj and 0-0837 H^O 

 Corresponding to U. 79-13. H 4-54. 

 C26H,804 requires C. 79-18, H 457. 



' Diphenyl-acefcyl-aoeto-resorcinol dimethyl ether was prepared from phenylacetic 

 ester and diacetoresorcinol dimethylether by the method already described [J. Algar, 

 loe. cit-l . 



