Title: Imazethapyr
CAS Registry Number: 81335-77-5
CAS Name: 2-[4,5-Dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid
Additional Names: (±)-5-ethyl-2-(4-isopropyl-4-methyl-5-oxo-1H-imidazolin-2-yl)nicotinic acid
Manufacturers' Codes: AC-263499; CL-263499
Molecular Formula: C15H19N3O3
Molecular Weight: 289.33
Percent Composition: C 62.27%, H 6.62%, N 14.52%, O 16.59%
Literature References: Selective imidazolinone herbicide. Inhibitor of acetolactate synthase, a key enzyme in the biosynthesis of branched chain amino acids. Prepn: M. Los, EP 41623; idem, US 4798619 (1981, 1989 both to Am. Cyanamid). Comprehensive description: T. R. Peoples et al., Proc. Br. Crop Prot. Conf. - Weeds 1985, 99-106. Determn in soil: O. Nováková, Chromatographia 39 62 (1994). Metabolism in corn: N. M. Mallipudi et al., J. Agric. Food Chem. 42, 1213 (1994).
Properties: White to off-white crystalline solid, mp 172-175°. pK1 2.1; pK2 3.9. Soly in water (25°): 1415 ppm. LD50 orally in rats and mice: >5000 mg/kg; dermally in rabbits: >2000 mg/kg (Peoples).
Melting point: mp 172-175°
pKa: pK1 2.1; pK2 3.9
Toxicity data: LD50 orally in rats and mice: >5000 mg/kg; dermally in rabbits: >2000 mg/kg (Peoples)
Derivative Type: Ammonium salt
CAS Registry Number: 101917-66-2
Trademarks: Pivot (BASF); Pursuit (BASF)
Molecular Formula: C15H22N4O3
Molecular Weight: 306.36
Percent Composition: C 58.81%, H 7.24%, N 18.29%, O 15.67%
Use: Herbicide.

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