1H NMR (400 MHz, CDCl3) δ 7.44 (d, J = 7.2 Hz, 2H), 7.39 (d, J = 7.3 Hz, 2H), 7.32 (q, J = 7.9 Hz, 5H), 6.21 (s, 1H), 4.66 (d, J = 9.6 Hz, 1H), 4.60 - 4.49 (m, 2H), 2.75 - 2.59 (m, 2H). 19F NMR (376 MHz, CDCl3) δ -115.14. 13C NMR(101 MHz, CDCl3) δ 142.2, 138.5, 133.4, 133.1, 128.6, 128.6, 127.8, 126.1, 126.0, 122.8, 75.9, 66.8, 34.9.