Pyrazosulfuron-Ethyl

PHYSICAL CHEMISTRY Mol. wt. 414.4 M.f. C14H18N6O7S Form Colourless crystals. M.p. 177.8-179.5 V.p. 4.2 ?10-5 mPa (25 ) KOW logP = 3.16 (hplc method) S.g./density 1.46 (20 ) Solubility In water 9.76 mg/l (20 ). In methanol 4.32, hexane 0.0185, benzene 15.6, 200, acetone 33.7 (all in g/l, 20 ). Stability Stable at 50 for 6 months. Relatively stable at pH 7. Unstable in acidic or alkaline media. pKa 3.7

NOMENCLATURE Common name pyrazosulfuron-ethyl
IUPAC name ethyl 5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazole-4-carboxylate
Chemical Abstracts name ethyl 5-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-1-methyl-1H-pyrazole-4-carboxylate
CAS RN [93697-74-6] Development codes NC-311 (Nissan)

Sulfonylureas (UK: sulphonylurea) are a class of organic compounds used in agriculture.

Sulfonylureas used as herbicides.
A large number of sulfonylureas are used as herbicides. They function by interfering with biosynthesis of the amino acids valine, isoleucine, and leucine. Compounds in this class include amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorimuron-ethyl, chlorsulfuron, ethametsulfuron-methyl, cinosulfuron, ethoxysulfuron, flazasulfuron, flupyrsulfuron-methyl-sodium, imazosulfuron, metsulfuron-methyl, nicosulfuron, oxasulfuron, primisulfuron-methyl, prosulfuron, pyrazosulfuron-ethyl, rimsulfuron, sulfometuron-methyl, sulfosulfuron, thifensulfuron-methyl, triasulfuron, tribenuron-methyl, and triflusulfuron-methyl.