7953. Pyraclostrobin

Nomenclature

CAS number: 175013-18-0
[2-[[[1-(4-Chlorophenyl)-1H-pyrazol-3-yl]oxy]methyl]phenyl]methoxycarbamic acid methyl ester; methyl N-[2-[[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxymethyl]phenyl]-N-methoxycarbamate; BAS-500F; Cabrio (BASF); Comet (BASF); Headline (BASF).
C19H18ClN3O4; mol wt 387.82.
C 58.84%, H 4.68%, Cl 9.14%, N 10.83%, O 16.50%.

Description and references

Strobilurin fungicide for use in seed grass and food crops. Prepn: B. Müller et al., DE 4423612; eidem, US 5869517 (1996, 1999 both to BASF). Comprehensive description: E. Ammermann et al., Brighton Crop Prot. Conf. - Pests Dis. 2000, 541-548. Review of activity and field trials: R. Stierl et al., ibid. 859-864.

Chemical structure

Properties

White or light beige crystalline solid, mp 63.7-65.2°. Vapor pressure at 20°: 2.6 × 10-8 Pa. Log P (n-octanol/water) at 22°: 3.99. Soly in water (20°): 1.9 mg/l. LD50 in rats (mg/kg): >5000 orally; >2000 dermally; LC50 in rainbow trout: 0.006 mg/l (Ammermann).

Use

Agricultural fungicide.