“…1‐Ethyl‐1 , 2‐dihydronaphthalene (10 b) :67 R f =0.72 (hexane); 1 H NMR (300 MHz, CDCl 3 ): δ =0.88 (t, J =7.3 Hz, 3 H,C H 3 CH 2 ), 1.60–1.80 (m, 2 H, CH 3 C H 2 ), 2.25 (apparent dt, J =17.1, 4.6 Hz, 1 H, CH H CHC), 2.51 (apparent ddt, J =17.1, 6.7, 3.1 Hz, 1 H, C H HCHC), 2.58–2.68 (m, 1 H, CH 2 C H CH 2 ), 5.80–6.07 (m, 1 H, CHC H CH 2 ), 6.42 (apparent dd, J =9.8, 2.0 Hz, 1 H, C H CHCH 2 ), 6.80–7.30 (m, 4 H, 4×H arom ); MS (70 eV, EI): m / z (%): 160 (<1) [ M +2H] + , 159 (2) [ M +H] + , 158 (19) [ M ] + , 130 (12), 129 (100), 128 (55), 127 (19), 51 (12).…”