FIGURE 4.

(A) The schematic for the synthesis of 3,5-dimethyl-1-phenyl-1H-pyrazol-4-amine. The nitroso group of the parent compound was reduced by catalytic hydrogenation and the desired product was obtained at a yield of 85% and purified using column chromatography. (B) The procedure for the synthesis of 4-bromo/chloro pyrazole derivatives. The halogen groups such as Cl, Br were introduced by reacting 3,5-dimethyl-1-phenyl-1H-pyrazole with either N-bromosuccinimide or N-chlorosuccinimide. The desired products were obtained with a yield of 75% and purified using column chromatography.