Hangzhou Leaflife Chemical Co., Ltd.

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RIMSULFURON

 

Herbicide:  sulfonylurea

RIMSULFURON

NOMENCLATURE
Common name rimsulfuron (BSI, pa E-ISO, ANSI)
IUPAC name 1-(4,6-dimethoxypyrimidin-2-yl)-3-(3-ethylsulfonyl-2-pyridylsulfonyl)urea 
Chemical Abstracts name N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2-pyridinesulfonamide 
CAS RN [122931-48-0]  Development codes DPX-E9636 (Du Pont) 

PHYSICAL CHEMISTRY
Composition Tech. is 99%.  Mol. wt. 431.4  M.f. C14H17N5O7S2 Form Colourless crystals.  M.p. 176-178 ºC  V.p. 1.5 × 10-3 mPa (25 ºC)  KOW logP = 0.288 (pH 5), -1.47 (pH 7) (25 ºC)  S.g./density 0.784 (25 ºC)  Solubility In water (25 ºC) <10 mg/l (unbuffered); 7.3 g/l (buffered, pH 7).  Stability On hydrolysis (25 ºC), DT50 4.6 d (pH 5), 7.2 d (pH 7), 0.3 d (pH 9).  pKa 4.0 
APPLICATIONS
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. Crop selectivity derives from rapid, selective metabolism by contraction of the sulfonylurea group and ring migration (L. Martinetti et al., Proc. Br. Crop Prot. Conf. - Pests Dis., 1995, 1, 405) and by hydroxylation on the pyrimidine ring, followed by glucose conjugation (M. K. Koeppe, IUPAC 5E-003 (1998); see Environmental Fate.  Mode of action Selective systemic herbicide, absorbed by the foliage and roots, with rapid translocation to the meristematic tissues.  Uses Rimsulfuron is a post-emergence sulfonylurea herbicide that effectively controls most annual and perennial grasses and several broad-leaved weeds in maize. Also used in tomatoes and potatoes. The target rate for most situations is 15 g a.i./ha. Rimsulfuron has a wide crop-safety margin under most conditions.  Formulation types WG.