46 PROCEEDINGS OF THE AMERICAN ACADEMY 



This acid gave chloracetylen, CCl = CH, which by the addition of 

 bromine formed chlortetrabroraethan, — 



CHBr^ 



I 



CClBr, 



By the action of potassic hydrate in alcoholic solution upon chlortri- 

 brompropionic acid, the elements of hydrochloric acid were eliminated, 

 with the formation in small quantity of tribromacrylic acid. 



From the evident analogy between chlorbromacrylic acid, from which 

 chlortribrompropionic was made, and ^-dibromacrylic acid, the structure 

 of chlorbromacrylic acid * is probably, — 



CBrCl 



II 

 CH 



I 

 COOH. 



Chlortribrompropionic acid would then have the form, — 



CBr^Cl 



I 

 CHBr 



I 

 COOH. 



* H. B. Hill, these Proceedings, Vol. XVII. p. 153. 



