7968. Pyridate

Nomenclature

CAS number: 55512-33-9
O-(6-Chloro-3-phenyl-4-pyridazinyl)carbonothioic acid S-octyl ester; fenpyrate; CL-11344; Lentagran (Syngenta).
C19H23ClN2O2S; mol wt 378.92.
C 60.22%, H 6.12%, Cl 9.36%, N 7.39%, O 8.44%, S 8.46%.

Description and references

Contact herbicide for control of weeds in cereals. Prepn: BE 816574; R. Schonbeck et al., US 3953445 (1974, 1976 to Chemie Linz). Description: A. Diskus et al., Proc. Br. Crop Prot. Conf. - Weeds 1976, 717; M. Chéroux, J.-M. Moncorge, Def. Veg. 38, 310 (1984). Residue analysis by HPLC: W. Lindner, H. Ruckendorfer, Int. J. Environ. Anal. Chem. 16, 205 (1983).

Chemical structure

Properties

Oily brown liquid, bp0.1 220°. mp 27°. nD20 1.568. d20 1.555. Flash pt (open cup): 200°C. Almost insol in water (90 ppm). Sol in organic solvents. LD50 in male rats, female rats, mice (mg/kg): 1970, 2400, >10,000 orally; in rabbits (mg/kg): >3450 dermally. LC50 (96 hr) in carp, trout: >100, 81 mg/l (Chéroux, Moncorge).

Use

Herbicide.