1.1: 51 percent / aq. cerium ammonium nitrate / acetonitrile / 1 h 2.1: pyridine / CH2Cl2 / 0.5 h / 0 °C 2.2: 81 percent / ethyl(diisopropyl)amine / DMAP / CH2Cl2 / 24 h 3.1: 70 percent / Mo[N-(tBu)(3,5-dimethylphenyl)]3 / toluene / 20 h / 80 °C 4.1: 82 percent / hydrogen / Lindlar / CH2Cl2 / 5 h / 750.06 Torr 5.1: 62 percent / TBAF / tetrahydrofuran / 0.25 h / 0 °C 6.1: 80 percent / aq. acetic acid / 2 h / 60 °C View Scheme