and possibly other groups. Histidine and serine reacted with thiophos- 
gene, to form UV-absorbing compounds (Lukens and Sisler, 1958). 
cs, and H,§ are evolved from thiophosgene in aqueous suspensions. 
These two gases were also evolved when captan reacted with cysteine in 
aqueous or alcoholic solutions. The formation of CS») from captan or from 
thiophosgene probably involved a di-(thiophosgene) intermediate. A 
compound with the melting point of di(thiophosgene) was isolated from 
aqueous solutions of thiophosgene. CS5, but not HS; was evolved when 
yeast cells were treated with captan. 
0 
ul 
NS Cl 
N-S-C-CI 
A Cl 
il 
O Captan 
Cysteine 
4° 
ae a 
2 
C ad 
| ‘oH \ C. . 
S id ae + NH+ of 
| f + H)S + CS2+ HCl 
; 1"2 on / H 
CH -CH- -& | Cc “sg 
% re | 
Cystine 2-Thiazolidine- 
Tetrahydro- thione -4-carboxylic 
Phthalimide Acid 
O 
il 
C C 
¢l Aqueous Ye | 
N-SC-C C] —___> | NH + (CSC15)5 
CI / Di(Thiophos - 
7 gene) 
6 V 
CSy+HyS 
Q 
re’ 
45 
