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Common name asulam (BSI, E-ISO, ANSI, WSSA, JMAF); asulame ((m) F-ISO); no name (Germany)
IUPAC name methyl sulfanilylcarbamate
Chemical Abstracts name methyl [(4-aminophenyl)sulfonyl]carbamate
CAS RN [3337-71-1]
PHYSICAL CHEMISTRY
Mol. wt. 230.2 M.f. C8H10N2O4S Form Colourless crystals. M.p. 142-144 ºC (decomp.) V.p. <1 mPa (20 ºC) Solubility In water 5 g/l (20-25 ºC). In dimethylformamide >800, acetone 340, methanol 280, methyl ethyl ketone 280, ethanol 120, hydrocarbons and chlorinated hydrocarbons <20 (all in g/l, 20-25 ºC). Other salts: in water, sodium >600, potassium >400, ammonium >400, calcium >200, magnesium >400 (all in g/l, 20-25 ºC). Stability Stable in boiling water ³6 h. Stable >4 y (pH 8.5, room temperature). pKa 4.82, forming water-soluble salts
APPLICATIONS
Biochemistry Inhibition of dihydropteroate synthase.
Mode of action Selective systemic herbicide, absorbed by the leaves, shoots, and roots, with translocation in both the symplastic and apoplastic systems to other parts of the plant. Causes a slow chlorosis in susceptible plants.
Uses Control of annual and perennial grasses and broad-leaved weeds in spinach, oilseed poppies, alfalfa, some ornamentals, sugar cane, bananas, coffee, tea, cocoa, coconuts, rubber, etc.; wild oats in flax; docks (Rumex spp.) in grassland, fruit trees and bushes, and on non-crop land; and bracken (Pteridium aquilinum) in grassland, non-crop land, and forestry. Application rates from 1-10 kg/ha, depending on crop.