Metsulfuron-methyl

TC&FORMULATION: 95%TC, 10%WP,60%WP,60%WDG

Structure Formula:  

NOMENCLATURE

metsulfuron-methyl

Common name metsulfuron-methyl

IUPAC name methyl 2-(4-methoxy-6-methyl-1,3,5-triazin-2-ylcarbamoylsulfamoyl)benzoate 

Chemical Abstracts name methyl 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]benzoate 

CAS RN [74223-64-6] 

PHYSICAL CHEMISTRY

metsulfuron-methyl

Composition Tech. is >96%.  Mol. wt. 381.4  M.f. C14H15N5O6S  Form Colourless crystals; (tech., off-white solid, with a faint ester-like odour).  M.p. 162 °C  V.p. 3.3 ´ 10-7 mPa (25 ºC)  KOW logP = 0.018 (pH 7, 25 °C)  Henry 4.5 ´ 10-11 Pa m3 mol-1 (pH 7, 25 ºC)  S.g./density 1.447 (20 °C)  Solubility In water 0.548 (pH 5), 2.79 (pH 7), 213 (pH 9) (all in g/l, 25 ºC). In hexane 5.84 ´ 10-1, ethyl acetate 1.11 ´ 104, methanol 7.63 ´ 103, acetone 3.7 ´ 104, dichloromethane 1.32 ´ 105, toluene 1.24 ´ 103 (all in mg/l, 25 ºC).  Stability Photolytically stable. Hydrolysis DT50 (25 °C), 22 d (pH 5), stable (pH 7 and 9).  pKa 3.8 (20 °C) 

APPLICATIONS

metsulfuron-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 systemic herbicide absorbed through the roots and foliage and translocated to the apex of the plants. Symptoms appear within days with death within 2-4 weeks.  Uses Controls a wide range of grass and broad-leaved weeds in wheat, barley, rice, oats and triticale by post-emergence application, at 4-8 g/ha. Formulation types WG.  

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