1 6 Proceedings of the Royal Irish Academy. 



The isosazole crystallizes in long colourless needles, which melt at 

 76 ; -77 : C. 



M':t}iyl-a-)iS-Dibromo-fi-p-met]ioxy-plicnyl-propwnyl-pyrumte, 



CFLO . C\H 5 . CHBr . CHBr . CO . CH ; . CO . COOCHY 



5 '24 grms. of p-methoxy-cirmamyl-pyruvie methyl ester were dissolved in 

 ahout 20 e.cs. chloroform : and a solution of 3*2 grms. of hromine in 10 ccs. 

 chloroform was slowly added. The odour of the bromine disappeared 

 immediately with evolution of a trace of hydrobromic acid. After standing 

 about an hour in a stoppered flask, the chloroform was distilled off in vacuo ; 

 and the reddish oily residue was dissolved in a small amount of benzene. On 

 addition of excess of ligroin, crystals of the dibromide were obtained. The 

 compound was recrystallized several times in this manner, and was finally 

 obtained as light-yellow-coloured needles, which melted with decomposition 

 at 106VL0S : C. Its alcoholic solution gave a bright red colour with ferric 

 chloride. 



- 2037 grm. of substance gave - 0617 grm. of HjO and - 2991 grm. of 

 CO,, corresponding to C 4004, H 336. 



C .HuBraOs requires C 398 and H 34. 



