n-butyllithium; potassium tert-butylate 1.) ether, hexane, from -60 deg C to 20 deg C; 2.) pentane, 3 h; Yield given. Multistep reaction;

1: CuBr / 1.) THF, -60 deg C; 2.) THF, 20 deg C, 2 h 2: 50 percent / acetylacetonate de vanadyle, peroxyde de tertiobutyle / benzene / 1 h at 20 deg C then 3 h at 50 deg C View Scheme

copper(I) bromide 1.) THF, -60 deg C; 2.) THF, 20 deg C, 2 h; Yield given. Multistep reaction;