1: 94 percent / triphenylphosphine, carbon tetrabromide / tetrahydrofuran / 3 h / Heating 2: 11 percent Chromat. / NiCl2*6H2O, sodium borohydride / methanol; tetrahydrofuran / 0.25 h / 0 °C View Scheme

1: 83 percent / thionyl chloride / CCl4 / Heating 2: 82 percent Chromat. / NiCl2*6H2O, sodium borohydride / methanol; tetrahydrofuran / 0.25 h / 0 °C View Scheme

1: pyridine 2: sodium iodide / acetone / Heating 3: 85 percent Chromat. / NiCl2*6H2O, sodium borohydride / methanol; tetrahydrofuran / 0.25 h / 0 °C View Scheme