1: 1.) BuLi; 2.) t-BuOK / 1.) ether, hexane, from -60 deg C to 20 deg C; 2.) pentane, 3 h 2: CuBr / 1.) THF, -60 deg C; 2.) THF, 20 deg C, 2 h View Scheme

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

di-tert-butyl peroxide; acetylacetonate de vanadyle in benzene 1 h at 20 deg C then 3 h at 50 deg C;