“…1-(1-Methylethyl)-3-phenyl-2-azetidinone (6b) : 1 H-NMR (200 MHz) δ 1.13 (d, 3H, J = 6.8 Hz), 1.15 (d, 3H, J = 6.8 Hz), 3.12 (dd, 1H, J = 5.3 and 2.5 Hz), 3.54 (t, 1H, J = 5.5 Hz), 3.93 (sept, 1H, J = 6.6 Hz), 4.15 (dd, 1H, J = 5.5 and 2.5 Hz), 7.2 (m, 5H). 13 C-NMR: δ 20.9, 21.2, 43.9, 44.8, 53.5, 127.9, 128.0, 129.4, 136.6, 168.1.…”