613 



ated ethylene-diphosphonium. I have identified these salts with those 

 obtained by means of dichloride and dibromide of ethylene, both by 

 a careful examination of their physical properties, and by the analysis 

 of the characteristic iodide and of the platinum-salt. I have not 

 been able to trace in the first of these reactions a salt of chlorethylated 

 triethylphosphonium ; but I have established by experiment that in 

 the reaction between triethylphosphine and brominated bromide of 

 ethyl, the formation of bromethyl-triethylphosphonium invariably 

 precedes the production of the diphosphonium-compound. 



XV. " Researches on the Phosphorus-Bases." No. XI. Experi- 

 ments in the Methyl- and in the Methylene- Series. By 

 A. W. HOFMANN, LL.D., F.R.S. Received July 24, 1860. 



In former notes I have repeatedly called attention to the trans- 

 formation of the bromide of bromethylated triethylphosphonium 

 under the influence of bases. In continuing the study of these reac- 

 tions, I was led to the discovery of a very large number of new com- 

 pounds, the more important ones of which are briefly mentioned in 

 this abstract. 



HYBRIDS OF ETHYLENE-DIPHOSPHONIUM. 



Action of Trimethylphosphine upon Bromide of Bromethyl-triethyl- 

 phosphonium . 



These two bodies act upon each other with the greatest energy, 

 and moreover exactly in the manner indicated by theory. The 

 resulting compound was of course examined only so far as was neces- 

 sary to establish the character of the reaction. 



The dibromide of the hybrid diphosphonium is more soluble than 

 the hexethylated compound formerly described, which in other 

 respects it resembles. Oxide of silver eliminates the extremely 

 caustic base 



which yields with hydrochloric acid and dichloride of platinum a 

 pale-yellow platinum-salt, 



C n H 28 P 2 Pt 2 C1 6 = [(C 2 H 4 ) ^^pjci, 2Pt C1 2 , 

 separating in scales from boiling water. 



