1: 35 percent / tetrahydrofuran / 1 h 2: 74 percent / N-bromosuccinimide / CCl4 / 48 h / Heating 3: 95 percent Chromat. / nickel(II) chloride / diethyl ether / 1.) -78 deg C, 30 min, 2.) RT, 1 h View Scheme

1: 74 percent / N-bromosuccinimide / CCl4 / 48 h / Heating 2: 95 percent Chromat. / nickel(II) chloride / diethyl ether / 1.) -78 deg C, 30 min, 2.) RT, 1 h View Scheme

nickel dichloride in diethyl ether 1.) -78 deg C, 30 min, 2.) RT, 1 h;

bis(acetylacetonate)nickel(II) in diethyl ether 1.) -78 deg C, 30 min, 2.) RT, 1 h;