Tribenuron-methyl

TC&FORMULATION: 95%TC, 10%WP, 75%WDG

Structure Formula:

NOMENCLATURE

tribenuron-methyl

Common name tribenuron-methyl

IUPAC name methyl 2-[4-methoxy-6-methyl-1,3,5-triazin-2-yl(methyl)carbamoylsulfamoyl]benzoate 

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]  EEC no. 401-190-1 

PHYSICAL CHEMISTRY

tribenuron-methyl

Composition Tech. is >95%.  Mol. wt. 395.4  M.f. C15H17N5O6S  Form Off-white powder with a slight pungent odour.  M.p. 142 ºC  V.p. 5.2 ´ 10-5 mPa (25 ºC)  KOW logP = 0.78 (pH 7, 25 °C)  Henry 1.03 ´ 10-8 Pa m3 mol-1  S.g./density 1.46 (20 °C)  Solubility In water 0.05 (pH 5), 2.04 (pH 7), 18.3 (pH 9) (g/l, 20 ºC). In acetone 3.91 ´ 104, acetonitrile 4.64 ´ 104, ethyl acetate 1.63 ´ 104, n-heptane 20.8, methanol 2.59 ´ 103 (mg/l, 20 °C).  Stability No significant photolysis occurs over the pH range 5-9 at 25 ºC. Does not ignite nor support combustion. Hydrolysis DT50 <1 d (pH 5), 15.8 d (pH 7), stable (pH 9) (all 25 ºC).  pKa 4.7 

APPLICATIONS

tribenuron-methyl

Biochemistry Affects sensitive weeds through inhibition of the enzyme acetolactate synthase (ALS). Inhibition of ALS leads to the rapid cessation of cell division and subsequent growth processes in plants.  Mode of action Selective, post-emergence herbicide, acting primarily through foliar uptake, with little or no soil activity. Symptoms of chlorosis appear in affected weeds in days with necrosis and death occuring after 10-25 days under optimal conditions.  Uses Post-emergence control of broad-leaved weeds in cereal crops, including wheat, barley, oats, rye and triticale, at 7.5-30 g/ha. Formulation types TB; WG. 

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