1: 81 percent / pyridine / CH2Cl2 / 1 h / 20 °C 2: 44 percent / (Me3Si)3SiH; AIBN / benzene / 4 h / Heating 3: 90 percent / AcOH; (n-Bu)4NF / tetrahydrofuran / 336 h / 20 °C View Scheme

1: 81 percent / pyridine / CH2Cl2 / 1 h / 20 °C 2: 44 percent / (Me3Si)3SiH; AIBN / benzene / 4 h / Heating 3: 90 percent / AcOH; (n-Bu)4NF / tetrahydrofuran / 336 h / 20 °C 4: 78 percent / H2; HClO4 / Pd/C / ethanol / 48 h / 3040 Torr View Scheme