Procuct Name:Bensulfuron-methyl 95%TC

CAS No.: 83055-99-6

Description: 

Bensulfuron-methyl

Herbicide

HRAC  B WSSA  2; sulfonylurea

NOMENCLATURE

Common name bensulfuron-methyl

Chemical Abstracts name methyl 2-[[[[[(4,6-dimethoxypyrimidin-2-yl)-amino]carbonyl]amino]sulfonyl]methyl]benzoate 

CAS RN [83055-99-6]

EEC no. 401-340-6

PHYSICAL CHEMISTRY

Composition Tech. is 96.5%.

Mol. wt. 410.4

M.f. C16H18N4O7S

Form White to pale yellow, odourless solid.

M.p. 185-188 ºC

V.p. 2.8 ´ 10-9 mPa (25 ºC)

KOW logP = 2.45 (pH 1.5), 0.62 (pH 7) (both at 30 ºC)

Henry 1.4 ´ 10-11 Pa m3 mol-1 

S.g./density 1.41

Solubility In water 2.9 (pH 5), 12 (pH 6), 120 (pH 7), 1200 (pH 8) (all in mg/l, 25 ºC). In acetone 1.38, acetonitrile 5.38, dichloromethane 11.7, ethyl acetate 1.66, hexane >0.01, xylene 0.280 (all in g/l, 20 ºC).

Stability Aqueous solutions are most stable under slightly alkaline conditions (pH 8), and slowly degrade under acidic conditions; DT50 11 d (pH 5), 143 d (pH 7) (25 ºC).

pKa 5.2    

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 is due to rapid metabolism in the crop. Metabolic basis of selectivity reviewed (M. K. Koeppe & H. M. Brown, Agro-Food-Industry, 6, 9-14 (1995)).

Mode of action Selective systemic herbicide, absorbed by the foliage and roots, with rapid translocation to the meristematic tissues.

Uses Selective pre- and post-emergence control of annual and perennial weeds and sedges (e.g. Butomus umbellatus, Scirpus maritimus, Scirpus mucronatus, Alisma plantago-aquatica, Sparganium erectum, Cyperus spp., Typha spp., etc.) in continuously flooded rice, at 30-100 g/ha.