7747. Primisulfuron-methyl

Nomenclature

CAS number: 86209-51-0
2-[[[[[4,6-Bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]benzoic acid methyl ester; 2-[3-(4,6-bis(difluoromethoxy)pyrimidin-2-yl)ureidosulfonyl]benzoic acid methyl ester; N-(2-methoxycarbonylphenylsulfonyl)-N′-[4,6-bis(difluoromethoxy)pyrimidin-2-yl]urea; CGA-136872; Beacon (Syngenta); Tell (Syngenta).
C15H12F4N4O7S; mol wt 468.34.
C 38.47%, H 2.58%, F 16.23%, N 11.96%, O 23.91%, S 6.85%.

Description and references

Post-emergence sulfonylurea herbicide. Prepn: W. Meyer et al., EP 84020; eidem, US 4478635 (1983, 1984 both to Ciba-Geigy). Comprehensive description: W. Maurer et al., Proc. Br. Crop Prot. Conf. - Weeds 1987, 41-48. Field trial in corn: C. L. Foy, H. L. Witt, Weed Technol. 4, 615 (1990).

Chemical structure

Properties

Colorless crystals, mp 203.1° (Maurer); also reported as mp 186-188° (Meyer). Vapor pressure (20°): <7.5 × 10-12 mm Hg. Soly in water (pH 7): 0.07 g/l at 20°. LD50 in rats (mg/kg): >4000 orally; >2000 dermally (Maurer).

Use

Herbicide.