Tribenuron-methyl

tribenuron-methyl
Chemical Abstracts name: methyl 2-[[[[(4-methoxy-6-methyl-1, 3, 5-triazin-2-yl)methylamino]carbonyl]amino]sulfonyl]benzoate
CAS RN: [101200-48-0]

PHYSICAL CHEMISTRY
tribenuron-methyl
Composition: Tech. is >95%. Mol. wt.: 395.4; M.f.: C15H17N5O6S; Form: Light brown, odourless solid. M.p.: 141 ºC; V.p.: 5.2x10-5 mPa (25 ºC). KOW: logP = -0.44 (pH 7). Henry: 1.03x10-8 Pa m3 mol-1 S.g./density: 1.5 (25 ºC). Solubility: In water 0.05 (pH 5), 2.04 (pH 7) (both in g/l, 20 ºC). In acetone 43.8, acetonitrile 54.2, carbon tetrachloride 3.12, ethyl acetate 17.5, hexane 0.028, and methanol 3.39 (all in mg/l, 25 °C). Stability: Stable at 45 ºC. On hydrolysis (45 ºC), stable at pH 8-10 but rapid loss at pH 12. Relatively unstable in most organic solvents. pKa: 5/

APPLICATIONS
tribenuron-methyl
Biochemistry: Branched chain amino acid synthesis (ALS or AHAS) inhibitor. Acts by inhibiting biosynthesis of the essential amino acids valine and isoleucine, hence stopping cell division and plant growth. Selectivity derives from rapid metabolism in the crop.
Mode of action: Rapidly absorbed by foliage and roots and translocated throughout the plant. Susceptible plants cease growth almost immediately after post-emergence treatment and are killed in 7-21 days. Surfactants increase the activity of tribenuron-methyl on certain broad-leaved weeds.
Uses: Post-emergence control of broad-leaved weeds in spring and winter cereals, at 9-30 g/ha.
Formulation types: TB; WG.