Title: Sulfometuron-methyl
CAS Registry Number: 74222-97-2
CAS Name: 2-[[[[(4,6-Dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acid methyl ester
Additional Names: N-[(4,6-dimethylpyrimidin-2-yl)aminocarbonyl]-2-methoxycarbonylbenzenesulfonamide; 2-[3-(4,6-dimethylpyrimidin-2-yl)ureidosulfonyl]benzoic acid methyl ester
Manufacturers' Codes: Aa-5648; DPX-5648
Trademarks: Oust (DuPont)
Molecular Formula: C15H16N4O5S
Molecular Weight: 364.38
Percent Composition: C 49.44%, H 4.43%, N 15.38%, O 21.95%, S 8.80%
Literature References: Nonselective pre- and post-emergence sulfonylurea herbicide for noncropland use; inhibits branched chain amino acid biosynthesis. Prepn: G. Levitt, EP 7687; idem, US 4394506 (1980, 1983 both to Du Pont); idem, Pestic. Chem.: Hum. Welfare Environ., Proc. 5th Int. Congr. Pestic. 1, 243 (1983). Herbicidal activity and toxicity: R. H. Harding et al., Proc. West. Soc. Weed Sci. 34, 120 (1981). Mechanism of action: T. B. Ray, Proc. Br. Crop Prot. Conf. - Weeds 1985, 131. HPLC determn in soil and water: E. W. Zahnow, J. Agric. Food Chem. 33, 479 (1985). Degradation and bioaccumulation studies: J. Harvey et al., ibid. 590; J. J. Anderson, J. J. Dulka, ibid. 596. Field trials: R. L. Atkins et al., Proc. South. Weed Sci. Soc. 36, 300 (1983); in afforested areas: A. Nir, Z. Arenstein, Proc. Br. Crop Prot. Conf. - Weeds 1987, 787.
Properties: White solid, mp 198-202°. Soly in water at 25° (ppm): 10 at pH 5, 300 at pH 7. pKa 5.7. LD50 in male, female rats (mg/kg): >5000, >5000 orally (Harding).
Melting point: mp 198-202°
pKa: pKa 5.7
Toxicity data: LD50 in male, female rats (mg/kg): >5000, >5000 orally (Harding)
Use: Herbicide.

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