98389-04-9

The original drug appears as off-white crystals with a specific gravity of 1.44 (20°C), a melting point of 181-182°C, and a vapor pressure of 0.0147mPa (20°C) at 20°C. Solubility (20°C): 1.45*10-2g/l, 0.2g/L, 234.4g/L, 15.6g/L, and 31.7g/L in water, n-hexane, chloroform, benzene, and acetone, respectively. The original drug contains no less than 98% of the active ingredient and is stable under normal storage conditions.

ChEBI: Pyrazosulfuron is a member of pyrazoles.

Industrial production of pyrazosulfuron is usually as the ethyl variant and typically begins with synthesis of the substituted pyrazole core, often through condensation of a beta-ketoester with hydrazine derivatives, followed by chlorination or activation at the appropriate position to enable later coupling. In parallel, the sulfonamide fragment is prepared by reacting a chlorosulfonyl intermediate with a selected amine to generate the sulfonyl chloride or sulfonamide precursor. These two components are then united through formation of the sulfonylurea bridge, usually by treating the sulfonamide with an isocyanate or carbamoyl-activating reagent and subsequently coupling it to the activated pyrazole moiety. After the key bond forming step, the crude product is purified by crystallization or solvent washing to remove unreacted materials and by-products.

Broad-spectrum activity, absorbed by roots and translocated through out plant by controlling the synthesis of amino acids. Inhibits plant amino acid synthesis - acetohydroxyacid synthase AHAS

Herbicide