“…Analytical data are in agreement with those previously reported in the literature. [ 17f , 21 ] R f ( n ‐hexane)=0.35; 1 H NMR (500 MHz, CDCl 3 ): δ =7.47 (ddd, J =8.3, 7.5, 1.7 Hz, 1H), 7.23 (d br, J =7.5 Hz, 1H), 7.06 (td, J =7.5, 1.0 Hz, 1H), 7.03 (d, J =8.3 Hz, 1H), 3.81 ppm (s, 3H); 13 C NMR (126 MHz, CDCl 3 ): δ =157.3, 144.6 (m, incl. app.…”