In a previous publication, new types of chalcones were prepared, and their brominated products were reacted with some nitrogen nucleophiles to produce substituted isoxazoles and pyrazoles (7). The present work intends to prepare other chalcone-type systems and to react them with dlfferent hydrazines to produce the corresponding pyrazoline systems (cf. Scheme I). Thus, terephthalaldehyde was reacted with acetophenone (Ia), p-methoxy-(Ib), ...
![3-[4-(2,5-diphenyl-3,4-dihydropyrazol-3-yl)phenyl]-2,5-diphenyl-3,4-dihydropyrazole Structure](https://image.chemsrc.com/caspic/323/34135-42-7.png)