“…R f = 0.30 (40:10 PE:EA); mp 139–140 o C, lit. mp 141–142 o C [43]; 1 H NMR (400 MHz, CDCl 3 ) δ 5.89 (1H, s), 6.67 (2H, dd, J = 2.4, 0.9 Hz), 7.00 (2H, td, J = 7.5, 1.0 Hz), 7.19 (2H, t, J = 7.9 Hz), 7.22–7.25 (1H, m), 7.28–7.30 (2H, m), 7.34–7.39 (4H, m), 7.40–7.43 (2H, m), 7.90 (2H, br s); 13 C NMR (100 MHz, CDCl 3 ) δ 40.2, 111.0, 119.3, 119.8, 120.0, 121.9, 123.6, 126.2, 127.1, 128.2, 128.7, 136.7, 144.0; HRMS (ESI+) calcd for C 23 H 19 N 2 [M+H] + 323.1543, found 323.1531 (error 3.7 ppm). All spectroscopic data were in agreement with the literature values.…”