1908 \ Ammonia-Ethyl-Phospho-Peatino-Cheoride 
95 
justified the hope that such a study of this compound might throw 
more light upon its constitution. Following the directions of Schut- 
enzberger and of Rosenheim, pure spongy platinum was heated with 
phosphorus pentachloride, the latter freed from trichloride and oxy- 
chloride by heating in a current of dry air at 110°. The fused mass 
on treatment with hot benzene, free from thiophene and purified 
by freezing, yielded on cooling an abundant crop of well crystallized 
Cl, 
Pt 
PC1 3 
Freed from benzene, at the same time carefully protected from the 
action of moisture, the compound wos immediately treated with 
absolute alcohol in order to convert it into the ethoxy derivative 
The alcoholic solution was then placed in a desiccator over two ves- 
sels, one containing concentrated sulphuric acid, the other pow- 
dered lime, and left to evaporate to crystallization. Removal to a 
new building necessitated cessation of the work for several months. 
On resuming, it was found that the solution in the desiccator had 
evaporated to dryness, no distinct crystallization being noticeable. 
This mass was dissolved in pure benzene and into the solution dry 
ammonia gas was conducted. The absorption of ammonia was 
accompanied by a marked elevation of temperature, the original 
yellowish tint of the solution gradually faded and then, rather 
suddenly, a mass of white crystals separated, the mass becoming 
almost solid. The completion of the reaction was indicated by the 
return to normal temperature. The crystal broth was set aside 
and owing to the exigiencies of other work, two weeks elapsed 
before the crystals were separated from their mother liquor. The 
substance, freed from benzene, was recrystallized from alcohol and 
obtained in a very pure form. 
