1208. Bifenox

Nomenclature

CAS number: 42576-02-3
5-(2,4-Dichlorophenoxy)-2-nitrobenzoic acid methyl ester; methyl 5-(2,4-dichlorophenoxy)-2-nitrobenzoate; 2,4-dichlorophenyl 3-(methoxycarbonyl)-4-nitrophenyl ether; MC-4379; Modown (Mobil; Rh^one-Poulenc).
C14H9Cl2NO5; mol wt 342.13.
C 49.15%, H 2.65%, Cl 20.72%, N 4.09%, O 23.38%.

Description and references

Pre-emergence herbicide. Prepn and herbicidal activity: BE 749444; R. J. Thiessen, US 3652645 (1970, 1972 both to Mobil). Comparison with other herbicides in corn: W. M. Dest et al., Proc. Annu. Meet. Northeast. Weed Sci. Soc. 27, 31 (1973). Metabolism in soil, plants: G. R. Leather, C. L. Foy, Pestic. Biochem. Physiol. 7, 437 (1977). Brief description: R. H. Dreger, Weeds Today 8(2), 18 (1977). Review: P. J. Kruger et al., Proc. 12th Br. Weed Control Conf. 2, 839-845 (1974).

Chemical structure

Properties

Yellow tan crystals, mp 84-86°. Practically insol in water (0.35 ppm at 25°). Soly in xylene at 25°: 30%. Vapor pressure at 30°: 2.4 × 10-6 mm Hg. LD50 orally in rats, mice: >6400, 4556 mg/kg; LC50 in pheasants, wild ducks: >5000 ppm (Kruger).

Use

Herbicide.