5800. Mefenpyr-diethyl

Nomenclature

CAS number: 135590-91-9
1-(2,4-Dichlorophenyl)-4,5-dihydro-5-methyl-1H-pyrazole-3,5-dicarboxylic acid diethyl ester; diethyl 1-(2,4-dichlorophenyl)-5-methyl-2-pyrazoline-3,5-dicarboxylate; AE-F107892; HOE-107892.
C16H18Cl2N2O4; mol wt 373.23.
C 51.49%, H 4.86%, Cl 19.00%, N 7.51%, O 17.15%.

Description and references

Herbicide safener that enhances metabolism of herbicides and exhibits selective control of grass weeds in wheat and barley. Prepn: W. R"osch et al., WO 9107874; eidem, US 5700758 (1991, 1997 both to Hoechst). Comprehensive description: E. Hacker et al., Brighton Crop Prot. Conf. - Weeds 1999, 15-22. Effects on glutathione S-transferase activity on dark-grown barley: R. Scalla, A. Roulet, Physiol. Plant. 116, 336 (2002). Field study of mixture with iodosulfuron-methyl-sodium in barley: S. R. King, E. S. Hagood, Jr., Weed Technol. 19, 372 (2005).

Chemical structure

Properties

mp 50-52°. Vapor pressure at 25°: 1.4 × 10-5 Pa. Soly in water (20°): 20 mg/ml (pH 6.2). Log P (octanol/water): 3.83 (pH 6.3, 21°). LD50 in rats (mg/kg): >5000 orally, >4000 dermally; LC50 in carp (mg/l): 2.4 (Hacker).

Use

Herbicide safener.