140 Royal Society : — 



amine. A glance at the fovnuila exhibits the perfect analogy of the 

 composition of this compound with that of the bromide formed by 

 the action of bibromide of ethylene on triethylphosphine. The de- 

 portment of the two salts with "nitrate and with oxide of silver is also 

 similar in every respect. 



By treatment with nitrate of silver, the bromine not belonging to 

 the ammonium may be removed without affecting the bromine of 

 the radical. The nitrate thus obtained, after separation of the excess 

 of silver, furnishes with bichloride of platinum a difficultly soluble 

 octahedral salt, crystallizable from a large quantity of boiling water, 

 and containing 



C2H3 "j 



C,o Hj3 Br N CI, ViG\= ^' ^^ I NCI, PtCl^ ; 



and with terchloride of gold an analogous compound crystallizing 

 from boiling water in splendid golden-yellow needles, 



Cjo Hi3 Br N CI, AuCl3= ^' ^ I NCI, AuCl^. 



(clHjBryJ 



Treatment with oxide of silver converts the bromide of trimethyl- 

 bromethylene-ammonium into the oxide of trimethyl-vinyl-ammonium : 



C2H3I 

 N Br + 2 AgO = 2 AgBr -h ^^ ^4 NO, HO. 



The solution of this substance Is a powerfully alkaline liquid, 

 which, on saturation with hydrobromic acid, furnishes a deliquescent 

 bromide of extreme solubility, entirely differing from the original 

 bromide. The corresponding chloride forms with bichloride of pla- 

 tinum an octahedral salt, likewise extremely soluble in water, but 

 Insoluhle in alcohol ; with terchloride of gold, beautiful yellow needles 

 recrystallizable from boiling water. c H "^ 



Platinum. salt CioH^.NCl, PtCU= ^'^' I NCI, PtCl. 



cIhJ 



Gold-salt . . Cjo H,2 NCI, AuCl3= ^^ H3 I ^0, AUCI3. 



As might have been expected from the experience gathered in the 

 phosphorus-series, the formation of the brominated bromide is in- 

 variably accompanied by the simultaneous production of the vinyl- 



