“…1 H-NMR (400 MHz, CDCl 3 ) δ 7.42 (dd, J = 1.8, 0.8 Hz, 1H), 7.32 (d, J = 8.3 Hz, 1H), 7.14–7.07 (m, 2H), 6.55 (dd, J = 3.4, 0.8 Hz, 1H), 6.44 (dd, J = 3.4, 1.8 Hz, 1H), 6.26 (s, 1H), 3.77 (s, 2H), 1.52 (s, 9H); 13 C-NMR (101 MHz, CDCl 3 ) δ 153.90, 153.86, 141.88, 139.86, 128.80, 124.70, 124.46, 115.71, 113.03, 111.71, 104.73, 80.80, 28.47 (in accordance with literature [ 63 ]).…”