1H NMR (400 MHz, CDCl3) δ 7.85 (d, J = 8.9 Hz, 4H), 7.70 – 7.38 (m, 1H), 5.52 (d, J = 77.2 Hz, 2H), 2.90 (s, 2H), 1.29 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 143.65, 138.87, 133.16, 132.78, 128.08, 128.04, 127.51, 126.24, 125.97, 125.06, 124.66, 119.10, 45.18, 33.30 26.96. GC-MS (m/z) = 235.