4119. Flucarbazone

Nomenclature

CAS number: 145026-88-6
4,5-Dihydro-3-methoxy-4-methyl-5-oxo-N-[[2-(trifluoromethoxy)phenyl]sulfonyl]-1H-1,2,4-triazole-1-carboxamide.
C12H11F3N4O6S; mol wt 396.30.
C 36.37%, H 2.80%, F 14.38%, N 14.14%, O 24.22%, S 8.09%.

Description and references

Acetolactate synthase inhibitor for control of weeds in wheat. Prepn: K.-H. Müller et al., EP 507171; eidem, US 5534486 (1992, 1996 both to Bayer). Comprehensive description: H. J. Santel et al., Brighton Crop Prot. Conf. - Weeds 1999, 23-28. Field trials in wheat: K. J. Kirkland et al., Weed Technol. 15, 48 (2001).

Chemical structure

Derivative

Sodium salt.

Nomenclature

CAS number: 181274-17-9
BAY MKH 6562; MKH 6562; SJO 0498; Everest (Bayer).
C12H10F3N4NaO6S; mol wt 418.28.
C 34.46%, H 2.41%, F 13.63%, N 13.39%, Na 5.50%, O 22.95%, S 7.67%.

Properties

Colorless, odorless crystalline powder, mp 200° (dec). Vapor pressure (20°): <1 × 109 Pa. d 1.59. pKa 1.9. Soly in water (20°): 44 g/l (pH 4-9). Log P (octanol/water): 0.89 (pH 4); 1.85 (pH 7); 1.89 (pH 9). LD50 in rats (mg/kg): >5000 orally; >5000 dermally. LD50 by inhalation in rats: >5.13 mg/l. LC50 in bluegill sunfish, rainbow trout: >99.3, >96.7 mg/l.

Use

Herbicide.