560 
EESEAECKES OE DE. HOEMA^ES'" AXD M. CAHOEES 
Allylic Mercaptan. 
When in the process for the preparation of the preceding compound the protosul- 
phide of potassium is replaced by the hydi'osulphate of sulphide of potassium, a volatile 
product is obtained, having a similar but more ethereal odour. This substance acts with 
energy upon oxide of mercury, with which it forms a compound dissolving in boiling 
alcohol and separating from it on cooling in the form of pearly scales of remarkable 
brilliancy, which present the greatest resemblance to mercaptide of mercury. The 
liquid obtained in the above-mentioned reaction boils at 90° C., and possesses a compo- 
sition and an aggregate of properties which closely resemble those of the mercaptan of 
the ethyl-series, being in fact the allylic mercaptan, 
CeHeS,. 
Submitted to analysis, this compound furnished the following results : — 
I. 0‘500 grm. of substance gave 0‘896 grm. of carbonic acid and O’STl gim. of water. 
II. 0‘300 grm. gave 0‘536 grm. of carbonic acid and 0’226 grm. of water. 
Theory. Esperiment. 
/- 
^ 
N 
I. 
11. 
6 equivs. of Carbon 
36 
48-65 
48-86 
48-71 
6 equivs. of Hydrogen 
6 
8-11 
8-23 
8-30 
2 equivs. of Sulphur . 
32 
43-24 
1 equiv. of Allylic mercaptan 
74 
100-00 
This compound is powerfully attacked by nitric acid with disengagement of binoxide 
of nitrogen ; the liquid assumes a red colour in the same manner as ethylic mercaptan, 
the product of the reaction being a peculiar acid, analogous to ethyl-sulphxu'ous acid, 
which forms with baryta a salt crystallizing in brilliant white scales. 
Sulphallylic Acid. 
When allylic alcohol is added in small quantities at a time to about its oato A’olume 
of monohydrated sulphuric acid, the mixture becomes heated AAuthout being sensibly 
coloured. If the acid liquor be diluted with about seA'en to eight times its volume of 
water, and then neutralized with carbonate of barium in fine powder, there is obtained 
on evaporation a substance which crystallizes in brilliant white lammse. 
This salt, which is formed under the very same conditions as sulphoAinate of barium, 
furnished on analysis the following results : — 
0T54 grm. of substance yielded 0‘087 grm. of sulphate of barium, which represents 
33TI per cent, of barium. 
The formula 
Ce Ba, S, 0« 
