*5-(2,5-dimethoxyphenyl)-3-(4-fluorophenyl)-4,5-dihydro-1H-pyrazole-1-carbaldehyde (***3g***)*

Mp = 153 ◦C; Rf = 0.82; 1H NMR (300 MHz, ppm, DMSO-*d*6): 8.91 (s, 1H, −CHO); 7.84–7.82 (m, 2H, arom.), 7.31–7.28 (m, 2H, arom.), 6.99–6.97 (d, 1H, arom.), 6.85–6.83 (d, 1H, arom.), 6.56–6.55 (d, 1H, arom.), 5.61–5.58 (m, 1H, CH-pyr.), 3.88–3.83 (m, 1H, −CH2-pyr.), 3.75 (s, 3H, OCH3), 3.66 (s, 3H, OCH3), 3.08–3.05 (m, 1H, CH2-pyr.); 13C NMR (DMSO-*d*6) δ (ppm): 164.1, 162.5, 159.6, 155.6, 153.1, 150.0, 130.0, 129.4, 129.0 (d, *J* = 9.61 Hz), 127.5, 115.9, 115.8, 112.7, 112.5 (d, *J* = 13.22 Hz), 56.0, 55.3, 54.6, 41.3; *m*/*z* calcd for [C18H17FN2O3]+ (M++H+Na): 328.34, found 351.20.
