615 



C 6 H 13 Br P PtCl 3 = [(C a H 4 Br)(C H,) 3 P] Cl, PtCl,. 



Treatment of this platinum-salt with sulphuretted hydrogen yielded 

 an extremely soluble and deliquescent chloride, which was not ana- 

 lysed, but submitted to the action of oxide of silver, when it furnished 

 the oxide of the corresponding oxethylated compound 



H 



The caustic liquid was converted by hydrochloric acid into the 

 easily soluble chloride corresponding to the oxide ; and this chloride, 

 when treated with dichloride of platinum, deposited the platinum- 

 salt of the oxethylated trimethylphosphonium in well-formed octa- 

 hedra extremely soluble in water, containing 



C. H u P O PtCl,= [(C 2 H 5 0)(C H 3 ) 3 P]C1, PtCl 2 . 



Salts of Hexmethylated Ethylene-diphosphonium. 



Dibromide. The preparation of this salt has already been men- 

 tioned. It is extremely soluble in water, and even in absolute alcohol, 

 insoluble in ether. In vacua over sulphuric acid it solidifies into a 

 mass of acicular crystals, which are exceedingly deliquescent. 



The dibromide, treated with oxide of silver, yields the correspond- 

 ing dioxide, 



which forms with acids a series of salts resembling the corresponding 

 ethyl-compounds. Of these I have prepared only the 



Di-iodide, which crystallizes in difficultly soluble needles of the 

 composition 



C H P I 



~ (CH 3 ) 3 P 



surpassing in beauty the corresponding ethyl-compound, and the 



Platinum-salt. This is an apparently amorphous precipitate, 

 which is nearly insoluble in water, dissolves with extreme slowness 

 in boiling hydrochloric acid, and separates therefrom on cooling in 

 golden-yellow laminae, very much like those of the platinum-salt 

 of the hybrid ethylene-trimethyl-triethyl-diphosphonium. It con- 

 sists of 



C. H 22 P 2 Pt, C1 = [(C. H 4 ) Jj p]"ci 3) 2PtCV 



