1H NMR (400 MHz, CDCl3) δ 8.34 (d, J = 8.1 Hz, 2H), 7.71 (dd, J = 22.4, 8.0 Hz, 4H), 7.52 – 7.38 (m, 3H), 7.31 – 7.24 (m, 3H), 6.94 (d, J = 6.8 Hz, 2H), 5.75 (s, 2H). 13C{1H} NMR (101 MHz, CDCl3) δ 182.9, 143.6, 140.4, 138.1, 137.0, 133.9 (d, J = 32.6 Hz), 132.0, 131.6, 131.2, 131.0, 130.3, 129.7, 128.9, 127.7, 125.9 (dd, J = 7.5, 3.7 Hz), 125.8, 125.0 (q, J = 3.5 Hz), 122.4, 49.6. HRMS (EI) m/z: calcd for C25H16F6N2O, 474.1167; found, 474.1165.