Synthesis and herbicidal activity of 5-arylmethoxy phenylpyrazole derivatives

Abstract

A series of novel 5-arylmethoxy phenylpyrazole derivateves are prepared from 4-chloro-2-fluoro-5-methoxybenzaldehyde via a condensation, ring closure, methylation, etc. All these structures are identified by1H NMR and HRMS techniques. Preliminary bioassay shows that some of the title compounds exhibit good herbicidal activity against the weeds. Especially, 4-cholro-3-[4-chloro-2-fluoro-5-(4-methoxybenzyloxy)phenyl]-l-methyl-5- trifluoromethyl)-1H-pyrazole shows 95% inhibition to abutilon at the dosage of 9.375 g•hm-2.