Ethoxysulfuron

Title: Ethoxysulfuron
CAS Registry Number: 126801-58-9
CAS Name: [[(4,6-Dimethoxy-2-pyrimidinyl)amino]carbonyl]sulfamic acid 2-ethoxyphenyl ester
Additional Names: 3-(4,6-dimethoxypyrimidin-2-yl)-1-(2-ethoxyphenoxysulfonylurea)
Manufacturers' Codes: HOE-095404
Molecular Formula: C15H18N4O7S
Molecular Weight: 398.39
Percent Composition: C 45.22%, H 4.55%, N 14.06%, O 28.11%, S 8.05%
Literature References: Post-emergence herbicide for use in grains and sugarcane; inhibits the enzyme, acetohydroxyacid synthase. Prepn: H. Kehne et al., EP 342569; eidem, US 5104443 (1989, 1992 both to Hoechst). Comprehensive description: E. Hacker et al., Brighton Crop Prot. Conf. - Weeds 1995, 73. Mode of selective action: H. Köcher, G. Dickerhof, ibid. 249. Field study in summer rice: M. K. Bhowmick, R. K. Ghosh, Adv. Plant Sci. 15, 499 (2002).
Properties: Crystals from diethyl ether, mp 145-147°. Vapor pressure (20°): 6.6 ´ 10-5 Pa. Partition coefficient (octanol/water) at 20°: 773 (pH 3); 1.01 (pH 7); 0.06 (pH 9). Soly in water at 20° (ppm): 26 (pH 5); 1353 (pH 7); 9628 (pH 9). LD50 in rats (mg/kg): >3270 orally; >4000 dermally (Hacker).
Melting point: mp 145-147°
Log P: Partition coefficient (octanol/water) at 20°: 773 (pH 3); 1.01 (pH 7); 0.06 (pH 9)
Toxicity data: LD50 in rats (mg/kg): >3270 orally; >4000 dermally (Hacker)
Use: Herbicide.
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