COMPOUNDS OF ETHYL-, PROPYL-, BUTYL-, AND AMYL-THETINES. 587 
Up to the present time hydrobromate of dipropyl-thetine— 
C,H, 
Br—S—CH,—COOH, 
C,H, 
has not been obtained in the solid state, nor was any analysis of the syrupy 
liquid attempted ; but there can be little doubt that the latter consists of the 
thetine compound—the phenomena attending its formation as well as its proper- 
ties indicating that such is the case. 
The product of the action of bromacetic acid on sulphide of propyl was 
mixed with water, which dissolved the greater part, but left about 4 grms. of 
sulphide of propyl, showing that only about half the theoretical quantity had 
been converted into the thetine compound. 
The aqueous solution was employed for the preparation of the lead and 
platinum salts. 
Action of Hydrobromate of Dipropyl-Thetine on Carbonate and Hydrate of 
Lead.—Some of the solution was boiled with carbonate of lead; effervescence 
occurred, and when this ceased the solution was filtered. On cooling, it 
deposited minute colourless needles or narrow plates (A). On filtering the 
solution from these, and allowing it to remain undisturbed for some time, 
minute tufts of needles were deposited (B). In a second experiment with a 
larger quantity of the solution, recently precipitated hydrate of lead was 
employed instead of the carbonate. The solution as it cooled deposited 
beautiful glistening thin plates (C). The mother liquor from them was again 
saturated with hydrate of lead, and yielded a second crop of crystals resem- 
bling the former in appearance (D). Determinations of lead in these four 
salts gave the following numbers :— 
Lead in 100. 
CNS pore ares Se ae Man deel 34020) 
Coy sere JON BOM aS TICS E 
(yt Tait on en i AO Tess 
MOM AE Send de aes 
A, C,and D have apparently the same composition, and the lead which 
they contain agrees with the quantity calculated for a compound of one molecule 
of the base dipropyl-thetine and three molecules of bromide of lead— 
CA ses "CH--CO C,H,  CH,—CO,'PbBr, 2PbBr,. 
wes ee 
S | S 
CH ——O ,3PbBr, , or CH, ‘Br 
VOL. XXVIII. PART II. 7N 
