carbon tetrabromide; triphenylphosphine in acetonitrile Ambient temperature;

1: 1.30 g / potassium hydroxide / Ambient temperature 2: H2 / Pd/C / 1.5 h / Ambient temperature 3: 77 percent / diborane gas / tetrahydrofuran / 1.) -10 deg C, 4 h, 2.) room temperature, overnight 4: 78 percent / triphenylphosphine, carbon tetrabromide / acetonitrile / Ambient temperature View Scheme

1: H2 / Pd/C / 1.5 h / Ambient temperature 2: 77 percent / diborane gas / tetrahydrofuran / 1.) -10 deg C, 4 h, 2.) room temperature, overnight 3: 78 percent / triphenylphosphine, carbon tetrabromide / acetonitrile / Ambient temperature View Scheme

1: 77 percent / diborane gas / tetrahydrofuran / 1.) -10 deg C, 4 h, 2.) room temperature, overnight 2: 78 percent / triphenylphosphine, carbon tetrabromide / acetonitrile / Ambient temperature View Scheme