*5-(3-fluorophenyl)-3-(4-fluorophenyl)-4,5-dihydro-1H-pyrazole-1-carbaldehyde (***3c***)*

Mp = 157 ◦C; Rf = 0.85; 1H NMR (300 MHz, ppm, DMSO-*d*6): 8.91 (s, 1H, −CHO); 7.86–7.84 (m, 2H, arom.), 7.42–7.39 (m, 1H, arom.), 7.33–7.31 (m, 2H, arom.), 7.13–7.08 (d, 3H, arom.), 5.58–5.56 (m, 1H, CH-pyr.), 3.95–3.90 (m, 1H, −CH2-pyr.), 3.28–3.24 (m, 1H, CH2-pyr.); 13C NMR (DMSO-*d*6) δ (ppm): 164.2, 163.1, 162.5, 161.5, 159.7, 155.2, 143.9, 130.8 (d, *J* = 8.41 Hz), 129.1 (d, *J* = 8.41 Hz), 127.3, 121.7 (d, *J* = 2.40 Hz), 115.9, 114.4, 114.2, 112.8, 112.7, 58.1, 42.2; MS: *m*/*z* calcd for [C16 H12F2N2O]+ ([M+H]+/ M++ H+Na): 286.28, found 287.10/309.20.
