Non-Oxidative Photoreaction of 1,3,5-Triaryl-2-Pyrazoline-4-Ol (4-Methoxy) Derivatives

•A suitable procedure for the synthesis of 2-pyrazoline-4-ol (-methoxy) derivatives is proposed.•Non-oxidative photochemical reaction of 2-pyrazoline-4-ol (-methoxy) derivatives in CHCl3 is occurred.•The electronic nature of the substituent on the 4- and 5-positions on the photochemical behavior is studied.•An efficient mechanism for the electron-transfer induced photoelimination reaction in chloroform is proposed.•DFT computational studies (optimization, orbital contour maps, MEP, NBO) at the B3LYP/6–31++(d,p) level of theory on these compoundsare reported.