DE. A. W. HOFMANN ON THE PHOSPHOEUS-BASES. 
499 
requires the following numbers : — 
Theory. 
Experiment. 
Cl4 
168 
24-91 
25-16 
34 
5-05 
4-74 
P 2 
62 
9-19 
Pt2 
197-4 
29-27 
Cle 
213 
31-58 
674-4 
100-00 
The compounds of chlorethylated triethylphosphonium are likewise formed under 
conditions similar to those which have already been mentioned as leading to the 
reproduction of the bromethylated from the oxethylated salt. On subjecting the 
chloride of oxethylated triethylphosphonium to the influence of pentachloride of phos- 
phorus, a violent reaction takes place, attended with evolution of vapours of oxychloride 
of phosphorus. If the chloride of phosphorus be added by small portions till no 
further action is perceptible, and the mixture be then digested till the hydrochloric acid, 
the oxychloride, and any excess of pentachloride are driven off, the chloride of the 
chlorethylated compound remains in the retort. 
[(C2 H, O) (C2 H5)3 P] Cl -f P CI3 = P O CI3 -f [(C, Cl) (C, n,), P] Cl + H Cl. 
To fix the nature of this reaction by a number, the solution of the residual chloride 
was precipitated with dichloride of platinum. On recrystallizing the platinum-preci- 
pitate from boiling water, the beautiful needles characteristic of the chlorethylated com- 
pound immediately made their appearance. 
By analysis, 
0-4122 grm. of platinum-salt gave 0-1065 grm. = 25-83 per cent, of platinum. 
The formula 
[(C,H,C1)(C2H5)3P]C1, PtCl, 
requires 25-52 per cent, of platinum. 
Monochlorinated chloride of ethyl acts on triethylphosphine like dichloride of ethylene. 
At the common temperature, and with a large^excess of the chlorinated compound, the 
chloride of chlorethyl-triethylphosphonium is produced, which was easily identified by 
the reaction with excess of nitrate of silver and ammonia, repeatedly mentioned in the 
previous memoir. At the temperature of 100°, and with a considerable excess of tri- 
ethylphosphine, crystals of the dichloride of ethylene-diphosphonium are soon deposited. 
The nature of the latter was fixed by the preparation of the characteristic platinum-salt, 
and of the beautifully crystallized di-iodide. 
Action of Di-iodide of Ethylene on Teiethylphosphine. 
The two bodies, in the absence of solvents, act upon one another with explosive 
violence. The heat evolved causes the iodide of ethylene to resolve itself into ethylene 
and iodine, which unites directly with the phosphorus-base. If the violence of the 
3 u 2 
