BROMACETIC ETHYL ETHER ON SULPHIDE OF METHYL. 623 
they rapidly decomposed and gave off inflammable vapour. Owing to its deli- _ 
quescence, the new substance was not analysed as such, but converted into 
platinum double salts, the analyses of which clearly prove it to consist of an 
addition product of sulphide of methyl and bromacetic ethyl ether, which may 
be called ethyl-bromate of dimethyl-thetine, just as the addition product of 
bromacetic acid and sulphide of methyl is called hydrobromate of dimethy]l- 
thetine— 
CH, CH, 
| | 
CH,—S—4.Br CH,—S—\ Br 
| Re | ie 
CH,CO;. C,H, CH,00,*H 
Ethyl-Bromate of Dimethyl-Thetine. Hydrobromate of Dimethyl-Thetine. 
Chloro-Platinate of Ethyl-Bromate of Dimethyl-Thetine—An aqueous solu- 
tion of the ethyl-bromate yielded an abundant yellow crystalline precipitate 
with a solution of chloride of platmum. This was collected, washed with a 
little cold water, and recrystallised from hot water (in which it dissolved with 
difficulty). The recrystallised salt consisted of beautiful scales of a light 
orange colour. 
A determination of platinum was made by calcining a weighed quantity of 
the salt— 
1450 germs. left 0360 grms. — 24:8 per cent. 
CH, 
| 
2 |CH,—S—Br , PtCl, requires 24°7 D 
| 
CH,—CO,C,H, 
A quantity of the ethyl-bromate of dimethyl-thetine was treated with excess 
of oxide of silver, and the solution filtered from the bromide of silver, which 
was at once produced ; it was then mixed with chloride of platinum and con- 
centrated on a water-bath ; on cooling, a dark red salt separated out, contain- 
ing water of crystallisation (which was partly lost in the desiccator). On 
recrystallisation from hot water its colour became lighter, and a platinum de- 
termination gave 28°02 per cent. 
In another experiment similarly conducted, but in which the concentration 
lasted a longer time, a much lighter coloured salt was obtained, which closely 
resembled chloro-platinate of dimethyl-thetine in appearance, and which was 
found to contain 28°3 per cent. of platinum. 
As the quantity of platinum calculated for the compound— 
CH 
3 
| 
2(CH,—S—Cl PtOly 
CH,—CO,C,H, 
VOL. XXVIII. PART II. WONG 
