1: 81 percent / n-BuLi / tetrahydrofuran; hexane / 1.) -78 deg C, 20 min, 2.) -78 deg C, 3 h; room temperature, 1 h 2: 75 percent / 0.2 M TFA / acetonitrile / 120 h / Ambient temperature 3: 144 mg / DMAP / CH2Cl2 / Ambient temperature View Scheme

1: 81 percent / n-BuLi / tetrahydrofuran; hexane / 1.) -78 deg C, 20 min, 2.) -78 deg C, 3 h; room temperature, 1 h 2: 53 percent / bis(tricyclohexylphosphine)benzylidene ruthenium dichloride / toluene / 18 h / 100 °C 3: 0.2 M TFA / acetonitrile / 192 h / Ambient temperature View Scheme

1: 81 percent / n-BuLi / tetrahydrofuran; hexane / 1.) -78 deg C, 20 min, 2.) -78 deg C, 3 h; room temperature, 1 h 2: 53 percent / bis(tricyclohexylphosphine)benzylidene ruthenium dichloride / toluene / 18 h / 100 °C 3: 0.2 M TFA / acetonitrile / 192 h / Ambient temperature View Scheme