Carfentrazone-ethyl

Title: Carfentrazone-ethyl
CAS Registry Number: 128639-02-1
CAS Name: a-2-Dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]-4-fluorobenzenepropanoic acid ethyl ester
Additional Names: ethyl 2-chloro-3-[2-chloro-4-fluoro-5-(4-difluoromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]propionate
Manufacturers' Codes: F8426
Trademarks: Aurora (FMC)
Molecular Formula: C15H14Cl2F3N3O3
Molecular Weight: 412.19
Percent Composition: C 43.71%, H 3.42%, Cl 17.20%, F 13.83%, N 10.19%, O 11.64%
Literature References: Cereal herbicide that disrupts membranes by inhibiton of protoporphyrinogen oxidase. Prepn: K. M. Poss, WO 9002120 (1990 to FMC). Properties: W. A. Van Saun et al., Brighton Crop Prot. Conf. - Weeds 1993, 19. Synthesis and structure-activity: G. Theodoridis et al., ACS Symp. Ser. 584, 90 (1995). Mode of action: F. E. Dayan et al., Pestic. Sci. 51, 65 (1997). Control of broadleaf weeds in maize: S. F. Tutt et al., Brighton Crop Prot. Conf. - Weeds 1995 731; in wheat and barley: S. W. Shires et al., ibid. 1997, 117.
Properties: Viscous yellow liquid, mp -22.1°. bp 760 350-355°. d20 1.457 g/cm3. Flash point: >110°C. log P (octanol/water): 3.36. Soly in water (mg/ml): 12 (20°); 22 (25°); 23 (30°). Vapor pressure at 25°: 1.2 ´ 10-7mm Hg; at 20°: 5.4 ´ 10-8mm Hg. LD50 in rats (mg/kg): 5143 orally (female); >4000 dermally (Van Saun).
Melting point: mp -22.1°
Boiling point: bp 760 350-355°
Flash point: Flash point: >110°C
Log P: log P (octanol/water): 3.36
Density: d20 1.457 g/cm3
Toxicity data: LD50 in rats (mg/kg): 5143 orally (female); >4000 dermally (Van Saun)
Use: Post-emergent herbicide.
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