*3-(4-fluorophenyl)-5-(2-methoxyphenyl)-4,5-dihydro-1H-pyrazole-1-carbaldehyde (***3b***)*

Mp = 110–112 ◦C; Rf = 0.84; 1H NMR (300 MHz, ppm, DMSO-*d*6): 8.91 (s, 1H, −CHO); 7.85–7.80 (m, 2H, arom.), 7.32–7.25 (m, 3H, arom.), 7.06–6.99 (d, 2H, arom.), 6.92–6.87 (d, 1H, arom.), 5.67–5.61 (m, 1H, CH-pyr.), 3.91–3.86 (m, 1H, −CH2-pyr.), 3.80 (s, 3H, OCH3), 3.09–3.02 (m, 1H, CH2-pyr.); 13C NMR (DMSO-*d*6) δ (ppm): 165.4, 162.1, 160.0, 156.4, 156.1, 129.6 (d, *J* = 8.78 Hz), 129.3, 128.7, 127.9, 126.4, 120.8, 116.5, 116.2, 111.9, 56.3, 55.1, 41.8; *m*/*z* calcd for [C17 H15FN2O2]+ ([M+H]+/ M++ H+Na): 298.31, found 299.20/321.10.
