5911. Mesosulfuron-methyl

Nomenclature

CAS number: 208465-21-8
2-[[[[(4,6-Dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-4-[[(methylsulfonyl)amino]methyl]benzoic acid methyl ester; methyl 2-[3-(4,6-dimethoxypyrimidin-2-yl)ureidosulfonyl]-4-methanesulfonamidomethylbenzoate; AE-F130060; Osprey (Bayer CropSci.); Silverado (Bayer CropSci.).
C17H21N5O9S2; mol wt 503.51.
C 40.55%, H 4.20%, N 13.91%, O 28.60%, S 12.74%.

Description and references

Sulfonylurea herbicide; acetolactate synthase inhibitor. Prepn: K. Lorenz et al., WO 9510507; eidem US 5648315 (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).

Chemical structure

Properties

Cream-colored solid, mp 195.4°. Vapor pressure (25°): 1.1 × 1011 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 × 103 (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).

Use

Herbicide.