Dasanit (Bayer 25141) [0,0-diethyl-O0-p(methylsulfinyl) phenyl phosphorothioate ] 
p32=labeled dasanit was applied to the stems of young cotton plants 
or to the roots of plants by immersion of roots in water dispersions. In 
the case of the stem application, more than 804 of the radioactivity was in 
the form of the parent compound. The major metabolites were the oxygen 
analog and dasanit sulfone. After nine days, a small amount of the oxygen 
analog sulfone was also detected (762). 
Dasanit underwent slow oxidation in air to form the sulfone 0,0-diethyl 
O-p-methylsulfonylphenyl phosphorothionate. In addition to this, the 
characteristic isomerization of phosphorothionates to phosphorothiolates 
also occurred. 
Metabolism studies with roaches have indicated the presence of the 
isomeride and sulfone of Dasanit and the S-ethyl isomer of the sulfone (104, 
105). 
Oo 
C,H.-S : 0 S CH C,H.-S : 0 d CH 
250 On eS eee: 2S5F ake: ae 3 
OCH. 255 
S-ethyl Dasanit analog S-ethyl Dasanit sulfone 
| o 
R tl a a 
(C,H.0) P-0-€) -S-CH, >» = (C,H, 0) ,P-0-€ ) -S-CH, 
Dasanit 
0 | 
R rT) 
-P-(0- -S= —_——___—_—_» -Pp-(0- -S- 
(CH,0), P-0O ©? S CH. (C,H.0) 5 P-0O «) S CH. 
| : | 
(o,850),-8-0-€) fn, ——> (,1,00,-f-0-€)--a1, 
Dasanit sulfone Dasanit oxygen analog 
sulfone 
126 
