“…[4] . Yield 55%; 1 H NMR (CDCl3, 300 MHz) δ 2.25 (s, 3H, CH3), 6.50 (dd, J = 9.1 and 4.4 Hz, 1H), 7.18-7.35 (m, 8H, Ph), 7.43-7.50 (m, 2H, Ph), 7.59 (dd, J = 9.1 and 1.8 Hz, 1H) and 7.97 (dd, J = 4.4 and 1.8 Hz, 1H); 13 C NMR (CDCl3, 75 MHz) δ 20.…”