VC-13 (0-[2,4-Dichlorophenyl]0,0-diethyl phosphorothioate) 
Studies have shown that non-hydrolyzed VC-13 residues were greatest 
in fat and fatty tissues of the body and that free 2,4-dichlorophenol, a 
hydrolysis product of VC-13, occurred primarily in the kidney and liver 
(Younger et al., 1962). Residues were at a maximum at 7 days after expo- 
sure; declined gradually; and were eliminated in 6 weeks by cattle and in 8 
weeks by sheep and goats (Younger et al., 1962). Cattle were sprayed with 
and sheep and goats were dipped in solutions with the desired concentrations. 
Cl Cl 
it 
Cl- -O-P-(0C5Hs) 5 ™ Cl- OH 
vc-13 
Zectran (4-dimethylamino-3,5-xylyl methylcarbamate) 
The metabolism of zectran was studied by feeding labeled material to 
a male beagle dog. Urine was collected and fractionated and metabolites 
isolated and identified by chromatography. Sulfates and glucuronides were 
present in the urine as water soluble conjugates of 4-dimethylamino-3,5- 
xylenol and 2,6-dimethylhydroquinone. Three other materials were not iden- 
tified. 
When applied to broccoli, in addition to 4-dimethylamino-3,5-xylenol 
and 2,6-dimethylhydroquinone, 2,6-dimethyl-p-benzoquinone and 4-dimethyl- 
amino-3,5-dimethyl-o-benzoquinone were also found. Examination of methanol 
insoluble material indicated incorporation of zectran into the lignin where 
it probably is permanently stored (Williams et al., 1964a, b). 
UV irradiation of zectran solutions affects zectran; however, no prod- 
ucts have been identified (Crosby et al., 1965; Eberle and Gunther, 1965). 
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