NiO2 in diethyl ether 0 deg C, 30 min --> r.t.;

1: 2.) NH4Cl / 1.) THF, -20 deg C, 2.) H2O 2: NiO2 / diethyl ether / 0 °C View Scheme

1: 1) Mg / 1) THF, reflux 0.5+1 h; 2) THF, -30 deg C, 10 min --> 0 deg C 2: 92 percent / nickel peroxide / diethyl ether / 0 deg C, 30 min --> r.t. View Scheme

1: 1) s-BuLi / 1) TMEDA/hexane, -78 deg C, 2 h -->0 deg C, 10 min; 2) TMDA/hexane, 0 deg, C, 2 min 2: 92 percent / nickel peroxide / diethyl ether / 0 deg C, 30 min --> r.t. View Scheme