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- 12. Spectral data for 2a: 1H NMR (200 MHz, CDCl3): δ 3.85 (s, 3H), 4.36 (s, 2H), 7.33–7.57 (m, 5H), 7.84 (s, 1H); 13C NMR (50 MHz, CDCl3): δ 26.62, 52.38, 128.60, 128.86, 129.55, 134.12, 143.11, 166.43; IR (neat): 1705, 1620 cm−1
- Spectral data for 4a: 1H NMR (200MHz, CDCl3): δ 4.19 (s, −CH2 protons, (Z)-isomer), 4.23 (d, −CH2 protons, J = 0.8 Hz, (E)-isomer) 7.23 (s, vinylic proton, (E)-isomer), 7.34 (s, vinylic proton, (Z)-isomer), 7.37–7.54 (m, 3H), 7.73–0.82 (m, 2H); 13C NMR (50MHz, CDCl3): δ 26.63, 32.70, 108.06, 117.03, 129.04, 129.23, 130.44, 131.39, 132.41, 146.47, 147.21 in these the signals at 26.63, 130.44, 147.21 are due to minor (Z)-isomer: IR (KBr): 2120, 1610 cm−1