86 PROCEEDINGS OF THE AMERICAN ACADEMY 



YIII. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY OF 



HARVARD COLLEGE. 



RESEARCHES ON THE SUBSTITUTED BENZYL COM- 

 POUNDS. 

 TWELFTH PAPER. 



CERTAIN PARABROMBENZYL COMPOUNDS. 

 By C. Loring Jackson and G. T. Hartshokn. 



Presented April 11th, 1883. 



In a previous paper of this series a number of paraclilorbenzyl com- 

 pounds containing sulphur were described ; in the following paper we 

 have the honor of laying before the Academy a description of the 

 corresponding compounds made from the parabrombeuzylbromide.* 



ParabrombenzylsvJpho-acid, CgH^BrCHgSOgH. 



The potassium salt of this substance was made by heating para- 

 brombenzylbromide with an aqueous solution of neutral potassic sul- 

 phite in a flask with a return-cooler until the odor of the bromide 

 disappeared. It was purified by crystallization from water, and dried 

 first in vacuo, and afterwards at 110°, which showed that it contained 

 no water of crystallization. 



0.2230 g. of the substance gave, according to Carius, 0.1454 g. of 

 argentic bromide. 



0.2624 g. gave 0.1724 g. of argentic bromide, and 0.2140 g. of 

 baric sulphate. 



0.2224 g., after evaporation with sulphuric acid, gave 0.0688 g. of 

 potassic sulphate. 



Calculated for CTHeBrSOaK. Found. 



Bromine 27.67 27.75 27.96 



Sulphur 11.07 11.20 



Potassium 13.50 13.89 



* The results obtained will be found in tabular form at the end of the article. 



