1: 82 percent / PPh3, CCl4 / 1 h / Heating 2: 71 percent / LiAlH4 / tetrahydrofuran / Ambient temperature 3: Ti(O-i-Pr)4, molecular sieves 4-Angstroem, O2, tetraphenylporphine / CH2Cl2 / 6 h / -10 - -5 °C / Irradiation View Scheme