“…Yield 80%. 1 H NMR (400 MHz, d 6 -(CH 3 ) 2 O, ppm): δ 8.71 (m, 2H, H4), 8.60 (m, 2H, H1), 8.45 (d, 2H, H5, 3 J P-H = 7,10 Hz), 7.97 (ddd, 2H, H3, 3 J H3-H2 ∼ 3 J H3-H4 = 7.73 Hz, 4 J H3-H1 = 1.80 Hz), 7.49 (m, 10H, Ph), 7.42 (ddd, 2H, H2, 3 J H2-H3 = 7.50 Hz, 3 J H2-H1 = 4.81 Hz, 4 J H2-H4 = 1.17 Hz). 31 ))] (0.1592 g, 0.32 mmol/0.1724 g, 0.32 mmol) in anhydrous THF (20 mL) is prepared under inert atmosphere, allowing the solution to cool in ice bath for 30 min.…”