DE. A. W. HOFMANN ON THE PHOSPHOEUS-BASES. 
437 
Platinum-salt of the Methyl-compound. 
The chloride obtained by treating the iodide with chloride of silver, yields upon 
addition of dichloride of platinum, an acicular platinum-salt, which may be recrystallized 
without decomposition from boiling water. Its composition corresponds to that of the 
iodide : 
Ci4H2;3NPSPtCl3 = 
(C S)" I 
[nP CbPtCl^. 
0’3395 grm. of platinum-salt, treated with carbonate of sodium, gave 0’0700grm. of 
platinum and 0‘3095 grm. of chloride of silver. 
Theory. 
1 equiv. of Phenyl-compound . 
253 
53-47 
1 equiv. of Methyl .... 
15 
3-16 
1 equiv. of Platinum 
98-7 
20-86 
3 equivs. of Chlorine . . 
106-5 
22-51 
1 equiv. of Platmum-salt . 
473-2 
100-00 
Experiment. 
20-62 
22-55 
The iodide, when treated with oxide of silver, furnishes, together with iodide of silver, 
a very caustic liquid containing the corresponding hydrate. The presence in this liquid 
of the compound 
H,,NPSO 
[(C H3)( (C S)“ (C, H,), (C, H,) N PJ 1 
HJ°’ 
is proved by the fact of the characteristic needle-shaped platinum-salt being immediately 
reproduced when it is saturated with hydrochloric acid and mixed with dichloride of 
platinum. The free base is, however, readily decomposed. On boiling, the odour of 
sulphocyanate of phenyl becomes at once perceptible ; if ebullition be continued until 
the odour has disappeared, addition of hydrochloric acid and dichloride of platinum 
no longer fui-nishes the difficultly soluble needles. In their place, large well-developed 
orange-yellow octohedra are deposited on evaporation, which by analysis were found to 
be the platinum-salt of methyl-triethylphosphonium. 
0-2210 grm. of platinum-salt, precipitated by sulphuretted hydrogen, &c., gave 0-0640 
grm. = 28-96 per cent, of platinum. 
The formula 
[(CH3)(C,H5),,P]C1, PtCl^ 
requires 29-18 per cent, of platinum. 
The free methylated phenyl-base then simply splits by ebullition into sulphocyanate of 
phenyl and oxide of methyl-triethylphosphonium. When the solution is boiled by 
itself, the sulphocyanate is separated as such ; when it is boiled in the presence of oxide 
of silver, the sulphocyanate is, partly at least, destroyed, the alkaline solution becoming 
acid and exhibiting the presence of considerable quantities of sulphuric acid. This 
transformation clearly shows how feebly the proximate constituents are held together 
