“…Starting from p ‐coumaric acid ( 1 , 307 mg) gave 11 as a white solid (272.34 mg, 81.3%), C 10 H 10 O 3 , mp 135–137°C; 1 H NMR (500 MHz, CDCl 3 ): δ = 7.62 (d, J = 16.9 Hz, 1H), 7.42 (d, J = 8.2 Hz, 2H), 6.82 (d, J = 8.1 Hz, 2H), 6.28 (d, J = 16.3 Hz, 1H), 3.78 (s, 3H); 13 C NMR (126 MHz, CDCl 3 ): δ = 168.15, 157.96, 144.87, 130.21, 116.10, 115.54, 51.90. The NMR data were consistent with those of literature (Rabbi et al, 2020).…”