524 
DR. A. W. HOFilAXX OX THE PHOSPHORUS-BASES. 
Theory. Esperiment. 
^ A ^ 
I. n. ni. IT. Y. 
1 equiv. of Arsonium . . 189-0 47-94 
1 equiv. of Platinum . . 98-7 25-05 24-87 24-79 25-15 24-78 25-02 
3 equivs. of Chlorine . . 106-5 27-01 27-07 
1 equiv. of Platinum-salt . 394-2 100-00 
Analyses I. and II. were made with the same specimen ; analysis III. with a salt 
obtained in a new preparation ; analysis IV. with a salt procured by precipitating the 
chloride left after the separation of the platinum in the form of sulphide in the pre^ious 
analysis. For the first three experiments, the solution of the bromethylated arsonium- 
compound was gently heated with oxide of silver ; for expeiiment V. the digestion had 
taken place in the cold. 
The above numbers show that the transformation of the bromethylated compound 
ensues according to the following equation : — 
[(C, H, Br)(C, H5)3 As] Br+^}o = 2 Ag 
The idea suggested itself that the vinyl-compound obtained in this reaction might be 
a secondary product resulting from the decomposition of an oxethylated compound of 
limited stability formed in the first instance : 
[(C3 H 30 )(C 3 H3)3 As] 1 _ Hi [(C3H3)(C3 H3)3 As]1 
H H r' 
It was with the view of avoiding this decomposition, that the digestion was accomplished 
at the common temperature for experiment V.; the result, however, showed that even 
in this case the vinyl-compound was obtained. 
Nevertheless the oxethylated body appears to exist. Under circumstances which 
were not sufficiently well observed at the time, the action of oxide of silver upon the 
bromide of the bromethylated triethylarsonium yielded an octohedral platinum-salt 
Avith the platinum percentage of the oxethylated compound. 
0-6103 grm. of platinum-salt, treated with sulphuretted hydrogen, &c., gaA'e 0-1448 
grm.=: 23-72 per cent, of platinum. 
The formula 
[(C^ H5 0)(C,H5)3As]Cl,Pta 
requires 23-94 per cent, of platinum. I have not been able to reproduce this substance. 
DIARSONIUM- COMPOUNDS. 
bihromide of Ethylene-hexethyl-diarsonium. — The bromide or chloride of the brom- 
ethylated arsonium is but sloAvly acted upon by triethylai-sine at 100° C’. Tavo days' 
digestion at that temperature had produced but a slight impression ; at 150° the reaction 
is accomplished in tAVo hours. The phenomena noAv to be recorded presented them- 
selves in the succession repeatedly observed in the phosphorus-series. The dibromide 
