Ryan and O'Riokdan— Action of Bromine on Diphenylamine. 225 



Since the amount of the bromo derivative derived from the 4.10-dinitro 



compound was much smaller than the amount of that derived from the 

 2.10-dinitro compound, the original body, which melted at 155-159° C, 

 consisted mainly of 2.10-dinitro-diphenylnitrosainine. 



VIIT. Action of Bromine on i.lO-Dinitro-DipJienylnitrosamine. 



- 5 gram of the crude dinitro-diphenylnitrosamine was brominated in the 

 manner described in experiment Vll ; and from the product of the bromina- 

 tion the same two substances were got as were obtained in the last 

 experiment. As was to be expected, the dibromo derivative of 2.10-dinitro- 

 diphenylamine was now formed in smaller quantity than before. It was not 

 possible to form an accurate idea of the relative amounts of the two dibromo 

 derivatives, but they were roughly about equal. 



IX. Action of Bromine on 2A.SA0-7Hmnitro-l)iphcni/lctmine. 



Attempts to brominate tetranitro-diphenylamine by the method used in 

 previous experiments were all unsuccessful, the compound being in all cases 

 recovered unchanged. 



In conclusion, we wish to thank Nobel's Explosives Company for the 

 materials employed in our experiments, and Mr. Ilintoul, the Manager of the 

 Research Section of that Company, at whose suggestion the investigation 

 was undertaken. 



