Asulam
Title: Asulam
CAS Registry Number: 3337-71-1
CAS Name: [(4-Aminophenyl)sulfonyl]carbamic acid methyl ester
Additional Names: N1-methoxycarbonylsulfanilamide; sulfanilylcarbamic acid methyl ester; methyl p-aminobenzenesulfonylcarbamate
Manufacturers' Codes: M & B 9057
Trademarks: Asulox (RP Agr.)
Molecular Formula: C8H10N2O4S
Molecular Weight: 230.24
Percent Composition: C 41.73%, H 4.38%, N 12.17%, O 27.80%, S 13.93%
Literature 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. Tech. 43, 10 (1998); in bracken control: R. J. Pakeman et al., J. Environ. Management 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).
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).
Melting point: mp 143-144°
pKa: pKa 4.82
Toxicity data: LD50 in rats, mice, dogs, rabbits (mg/kg): >5000, >5000, >5000, >2000 orally; in rats (mg/kg): >1200 dermally (Brockelsby)
Use: Herbicide.

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