522 
DE. A. W. HOFMAXN- OX THE PHOSPHOErS-BASES. 
product of the reaction was treated with water, which extracted a soluble bromide from 
the ethylene-compound unacted upon. On evaporation, a beautiful bromide was left, 
which, being copiously soluble in boiling, and sparingly soluble in cold alcohol, could 
be readily recrystallized from absolute and even from common alcohol. In water this 
substance is excessively soluble ; it is therefore scarcely crystallizable from an aqueous 
solution. 
Analysis, as might have been expected, proved this salt to be the analogue of the 
bromethylated triethylphosphonium-salt. It contains 
C, As Br, = [(C, Br) {C, H 5)3 As] Br. 
The bromide of bromethyl-triethylarsonium, the composition of which is sufficiently 
established by the analysis of the corresponding platinum-salt (see below), can be 
obtained in beautiful crystals. Their form — the rhombic dodecahedi-on — is identical 
with that of the corresponding bromethyl-triethyiphosphonium-compound, which the 
crystals resemble also in their general habitus. I quote the folloudiig from Sella's 
examination : — 
“ System monometric. 
Forms observed: — 
1 1 0 (Fig. 79). 
Angles. 
Calculated. 
Observed. 
110 , T 1 0 
0 i 
= 90 0 
0 / 
90 3 
110 , 101 
= 60 0 
60 0 
110 , oil 
= 60 0 
60 8 
No influence on polarized light.” 
Fig. 79. 
Platinum-salt . — The solution of the previous salt, converted by treatment with chlo- 
ride of silver into the corresponding chloride, yields with dichloride of platinum splendid 
needles of a double salt, difficultly soluble in cold and even in boiling water. 
I. 0-9695 grm. of salt, treated with sulphuretted hydrogen, &:c., gave 0-2040 grin, of 
platinum. 
II. 1-2175 grm. of salt of a new preparation, analysed in the same manner, gave 
0-2545 grm. of platinum. 
III. 1-2815 grm. of salt of the last preparation gave 0-2715 grm. of platinum. 
The formula 
Cg Hjy Br As Ft CI 3 = [(C^ Br) (C., H^);, As] Cl, Ft Cl, 
requires the following values : — 
