857. Asulam

Nomenclature

CAS number: 3337-71-1
N-[(4-Aminophenyl)sulfonyl]carbamic acid methyl ester; N1-methoxycarbonylsulfanilamide; sulfanilylcarbamic acid methyl ester; methyl p-aminobenzenesulfonylcarbamate; M & B 9057; Asulox (RP Agr.).
C8H10N2O4S; mol wt 230.24.
C 41.73%, H 4.38%, N 12.17%, O 27.80%, S 13.93%.

Description and references

Carbamate herbicide; folic acid biosynthesis inhibitor. Prepn: BE 622214 (1963 to May & Baker). Description of herbicidal properties: H. J. Cottrell, B. J. Heywood, Nature 207, 655 (1965). Persistence in soil: A. E. Smith, A. Walker, Pestic. Sci. 8, 449 (1977). Mode of action: P. Veerasekaran et al., Pestic. Sci. 12, 325, 330 (1981). Field study on sugarcane and torpedograss: M. A. Hossain et al., J. Weed Sci. Technol. 43, 10 (1998); in bracken control: R. J. Pakeman et al., J. Environ. Manage. 53, 255 (1998). Review of properties and analytical methods: C. H. Brockelsby, D. F. Muggleton, Anal. Methods Pestic. Plant Growth Regul. 7, 497 (1973); A. Guardigli et al., ibid. 13, 197 (1984).

Chemical structure

Properties

White crystals, mp 143-144° (dec). Soly: water 0.5%, hydrocarbons <2%, chlorinated hydrocarbons <2%, acetone 34%, methanol 28%. pKa 4.82. LD50 in rats, mice, dogs, rabbits (mg/kg): >5000, >5000, >5000, >2000 orally; in rats (mg/kg): >1200 dermally (Brockelsby).

Use

Herbicide.