COMPOUNDS OF ETHYL-, PROPYL-, BUTYL-, AND AMYL- THETINES. 585 
Its formation may be represented by the equation— 
4(O,H,,80,Br) + 2PbCO, + H,O = C,H,,80,,2PbBr, + 3(C,H,,80,) + 2CO,. 
YS —_—_Y — SY 
ee 
Hydrobromate of Diethyl- Lead Salt. Ethyl-Thetine. 
Thetine. 
Hydrochlorate of Diethyl-Thetine—About 12 grms. of the hydrobromate 
were converted into sulphate by treating the solution with sulphate of silver. 
To the resulting solution, filtered from the bromide of silver, the calculated 
quantity of chloride of barium dissolved in water was added. The solution of 
hydrochlorate of diethyl-thetine thus obtained was filtered from the precipitated 
sulphate of barium, and concentrated at ordinary temperatures in a desiccator. 
The solution left a syrupy liquid, which did not crystallise even after weeks’ 
standing. It can scarcely be doubted that the hydrochlorate is a solid sub- 
stance ; but up to the present time it has not been obtained in the crystalline 
condition, and I have therefore not attempted its analysis. As to its composi- * 
tion, but little doubt can exist on account of the splendid salt which it yields 

| 
| 
| 

with chloride of platinum. 
Chloro-Platinate of Diethyl-Thetine.—Some of the solution of the hydro- 
chlorate was mixed with chloride of platinum, and the mixture evaporated 
somewhat in a water bath and then left to itself. Beautiful dark orange 
erystals of considerable size soon separated. This salt, unlike the correspond- 
ing methyl compound, contains no water of crystallisation ; otherwise the two 
bodies have a similar composition,* as shown by a determination of the 
platinum— 
1848 gave 0515 platinum = 27-9 per cent. 
(C.H,,50,Cl),PtCl, requires 279 _,, 
Sulphate of Diethyl-Thetine—About 30 grms. of the hydrobromate were 
dissolved in water, a slight excess of sulphate of silver added, and the mixture 
digested in a water bath. From time to time some of the liquid was removed 
and tested with fresh sulphate of silver, to see that the whole of the hydro- 
bromate had been decomposed. When this was found to be the case, the 
solution was separated from the bromide of silver by filtration, a few drops 
of hydrochloric acid added to precipitate sulphate of silver which had dissolved, 
the solution again filtered and set to evaporate in a desiccator. After some 
weeks a syrupy liquid remained, which refused to crystallise even after months’ 
* Chloro-platinate of dimethy]-thetine crystallises with 2 molecules of water and has the com- 
position expressed by the formula 2(C,H,SO,CI), PtCl,, 2H,O. 
