Rimsulfuron
NOMENCLATURE
Common name Rimsulfuron
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
EEC no.
CONTROL OBJECT
Crop
Control object
PHYSICAL CHEMISTRY

Composition Tech. is 99%. 

Mol. wt. 431.4 

M.f. C14H17N5O7S2 

Form Colourless crystals. 

M.p. 172-173 °C (purity >98%) 

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

APPLICATIONGS
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. - Weeds, 1995, 1, 405) and by hydroxylation on the pyrimidine ring, followed by glucose conjugation (M. K. Koeppe, IUPAC 5E-003 (1998)); see Environmental Fate. Biochemistry
Selective systemic herbicide, absorbed by the foliage and roots, with rapid translocation to the meristematic tissues. Mode of action
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/ha. Rimsulfuron has a wide crop-safety margin under most conditions. Uses
PRODUCT INFORMATION
Standard of technical material
Testing itemsStandard(w/w)
Content
Loss of drying
Water
Formulation type
content
Package
Mix with
Typical application rates