1: 94 percent / aq. NaOH, tetrabutylammonium bromide / CH2Cl2 / 16 h 2: 39 percent / Ph3SnH, AIBN / benzene / 6 h / Heating 3: 65 percent / sodium naphthalenide / tetrahydrofuran / 0.03 h 4: 71 percent / 10percent Pd/C / various solvent(s) / 56 h / 210 °C View Scheme