2-[2-chloro-4-fluoro-5-[5-methyl-6-oxo-4-(trifluoromethyl)pyridazin-1- yl]phenoxy]acetic acid

Flufenpyr is a herbicide for agricultural use.

Flufenpyr is produced through the same broad industrial logic used for other pyridine-based herbicides: manufacturers first construct the heteroaromatic core, then introduce the required substituents through controlled halogenation, coupling, and alkylation steps, and finally refine the material to technical-grade purity. The upstream sequence typically involves assembling the substituted pyridine scaffold, adding the fluorinated and chlorinated groups that define the molecule’s herbicidal profile, and carrying out any necessary condensation or side chain introduction under conditions that minimise isomer formation and by-products. Once the target structure is fully built, the crude product undergoes purification, often involving solvent washes, phase separations, and crystallisation, to yield technical flufenpyr.

ChEBI: A ring assembly that is phenoxyacetic acid in which the phenyl group has been substituted at position 2 by chlorine, position 4 by fluorine, and position 5 by a 5-methyl-6-oxo-4-(trifluoromethyl)pyridazin-1(6H)-yl group. Its esters, part cularly the ethyl ester (flufenpyr-ethyl), are used as contact herbicides for the control of broad-leaved weeds.

Protoporphyrinogen oxidase inhibitor

Herbicide