Common Name

Nicosulfuron

Action

Herbicide

Class

Sulfonylurea

CAS number

111991-09-4

Structural Formula

Physical and Chemical Characteristics

M.f. : C₁₅H₁₈N₆O₆S

Mol. Wt. : 410.4

Form : Colourless crystals

Chemical name :
2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide

M.p. : 169-172 °C

V.p. : <8 × 10^-7 mPa (25 °C)

Kow logP : -0.36 (pH 5), -1.8 (pH 7), -2 (pH 9)

Henry : <1.48 × 10^-11 Pa m3 mol^-1 (25 °C)

S.g./density: 0.313 (bulk)

Solubility:
In water 0.07 g/l. In acetone 18, ethanol 4.5, chloroform, dimethylformamide 64, acetonitrile 23, toluene 0.370, hexane <0.02, dichloromethane 160 (all in g/kg, 25 °C)

Stability:
Hydrolysis DT₅₀ 15 d (pH 5); stable at pH 7 and pH 9

pKa : 4.6 (25 °C)

Specification

Nicosulfuron content, % ≥ 95.0
Water content, % ≤ 1.0
PH range : 4.0~7.0
Acetone insoluble, % ≤ 0.5