8230. Rimsulfuron

Nomenclature

CAS number: 122931-48-0
N-[[(4,6-Dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2-pyridinesulfonamide; DPX-E9636; Matrix (DuPont); Titus (DuPont).
C14H17N5O7S2; mol wt 431.44.
C 38.97%, H 3.97%, N 16.23%, O 25.96%, S 14.86%.

Description and references

Sulfonylurea herbicide; blocks branched-chain amino acid synthesis by inhibiting the plant enzyme, acetolactate synthase. Prepd (not claimed): P. H. Liang, US 4774337 (1988 to DuPont); and use in herbicidal mixtures: idem, EP 341011 (1989 to DuPont), C.A. 113, 6360 (1990). Comprehensive description: H. L. Palm et al., Brighton Crop Prot. Conf. - Weeds 1989, 23-28. HPLC, TLC determn and environmental fate: G. E. Schneiders et al., J. Agric. Food Chem. 41, 2402 (1993). Field trials in potatoes: C. V. Eberlein et al., Weed Technol. 8, 428 (1994).

Chemical structure

Properties

mp 176-178°. pKa 4.1. Vapor pressure at 25°: 1.1 × 10-8 Torr. Soly in water at 25° (ppm): 135 (pH 5); 7300 (pH 7); 5560 (pH 9). Partition coefficient (octanol/water): 0.034 (pH 7). LD50 orally in rats: >5000 mg/kg; dermally in rabbits: >2000 mg/kg (Palm).

Use

Herbicide.