OXOMUM COMPOUNDS McINTOSH 103 



While some doubt exists of compound formation with the 

 halogens, acetic anhydride readily unites with hydrobromic 

 acid. Considerable heat is evolved when the anhydride is added 

 to the liquefied acid, and the mixture is an excellent conductor 

 of electricity. A white crystalline compound, (M.P. — 5°) 

 separates out, and shows on analysis 52.1 per cent. acid. It 

 is probably: 



Ir2' r^-^\ •' H Br 

 \Crf, Co J, 



which contains 54.3 per cent. This rather complex combination'^ 

 is of the same type as certain compounds of the halogen hy- 

 drides with acetic acid. 



Dalhousie University, 

 May, 1924. 



15. Jour. Am. Chem. Soc. 45, 28,538. (1906). 



