94 PROCEEDINGS OF THE AMERICAN ACADEMY 



VIII. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY 

 OF HARVARD COLLEGE. 



By Charles F. Mabeky. 



Presented February 8, 1882. 



Thk investigations described in the following papers were made under 

 my supervision, and they formed a part of the work in the Summer 

 Course of Instruction in Chemistry for 188L 



DIBROMIODACRYLIC AND CHLORBROMIODACRYLIC ACIDS. 



Charles F. Mabery and Rachel Llotd. 



From the ease with which various substituted acrylic acids have 

 been obtained from bromjjropiolic acid,* we were led to believe that 

 derivatives of some interest would result by the simultaneous addition 

 of different halogens. This idea was confirmed by a few preliminary 

 experiments, which showed that iodine monobromide and iodine mono- 

 chloride could readily be made to form addition-products with brom- 

 propiolic acid. These substances have been submitted to a careful 

 study, and the results we have obtained are presented in this paper. 



DinROMIODACRTLIC AciD. 



Dibromiodacrylic acid was made from brompropiolic acid, by the 

 action of iodine monobromide. In the preparation of iodine mono- 

 bromide according to the method of Lagermarck,t the required weiglit 

 of iodine, with an excess of bromine, was heated to 50° for ten minutes 



* These Proceedings, Vol. XVI. pp. 211, 235. 



t Berichte der deutsch. chem. Gesellsch. 1874, 907. 



