3374. Dithiopyr

Nomenclature

CAS number: 97886-45-8
2-(Difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioic acid S,S-dimethyl ester; S,S-dimethyl 2-(difluoromethyl)-4-isobutyl-6-trifluoromethyl-3,5-pyridinedicarbothioate; MON-15100; MON-7200; Dimension (Dow AgroSci.).
C15H16F5NO2S2; mol wt 401.42.
C 44.88%, H 4.02%, F 23.66%, N 3.49%, O 7.97%, S 15.98%.

Description and references

Selective herbicide for weed control in turfgrass and selected crops. Prepn: L. F. Lee, EP 133612; idem, US 4692184 (1985, 1987 both to Monsanto). Herbicidal properties: M. Fujiyama, S. Yamane, Shokubutsu no Kagaku Chosetsu 24, 49 (1989), C.A. 111, 227154n (1989).

Chemical structure

Properties

Colorless, crystalline solid with faint odor, mp 65°. vapor pressure at 25°: 4 × 10-6 mm Hg. Soly in water (20°): 1.38 ppm. LD50 orally in rats: >5000 mg/kg (Fujiyama, Yamane).

Use

Herbicide.