Title: Mesosulfuron-methyl
CAS Registry Number: 208465-21-8
CAS Name: 2-[[[[(4,6-Dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-4-[[(methylsulfonyl)amino]methyl]benzoic acid methyl ester
Additional Names: methyl 2-[3-(4,6-dimethoxypyrimidin-2-yl)ureidosulfonyl]-4-methanesulfonamidomethylbenzoate
Manufacturers' Codes: AE-F130060
Trademarks: Osprey (Bayer CropSci.); Silverado (Bayer CropSci.)
Molecular Formula: C17H21N5O9S2
Molecular Weight: 503.51
Percent Composition: C 40.55%, H 4.20%, N 13.91%, O 28.60%, S 12.74%
Literature References: Sulfonylurea herbicide; acetolactate synthase inhibitor. Prepn: K. Lorenz et al., WO 9510507; eidem US5648315 (1995, 1997 both to Hoechst Schering AgrEvo). Comprehensive description: E. Hacker et al., BCPC Conf. - Weeds 2001, 43-48. Greenhouse trial of combination with iodosulfuron-methyl-sodium in winter wheat: W. A. Bailey et al., Weed Sci. 51, 515 (2003).
Properties: Cream-colored solid, mp 195.4°. Vapor pressure (25°): 1.1 ´ 10-11 Pa. Log P (octanol/water): 1.39 (pH 5); -0.48 (pH 7); -2.06 (pH 9). Soly in water at 20° (g/l): 7.24 ´ 10-3 (pH 5); 0.483 (pH 7); 15.39 (pH 9). LD50 in rats (mg/kg): >5000 orally; >5000 dermally. LC50 in rats: >1.33 mg/l air (Hacker).
Melting point: mp 195.4°
Log P: Log P (octanol/water): 1.39 (pH 5); -0.48 (pH 7); -2.06 (pH 9)
Toxicity data: LD50 in rats (mg/kg): >5000 orally; >5000 dermally; LC50 in rats: >1.33 mg/l air (Hacker)
Use: Herbicide.
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