Synthesis and Light-activated Herbicidal Activities of 1,3,5-Triaryl-2-pyrazoline

In order to study the light-activated herbicidal activities of 2-pyrazoline, five 1,3,5-triaryl-2-pyrazoline identified by IR、1H NMR、MS and elemental analysis, were synthesized via the reaction of 1,3-diaryl-2-propen-1-one with phenylhydrazine. Spectrum properties of title compounds were also studies. The tests of light-activated herbicidal activities indicated that the IC50 of title compound Ⅱ e against root length of Echinochloa crus-galli under light is 4.46 μg/mL. Its light-activated radio is 2.69.