sodium hydride in N,N-dimethyl-formamide 6 h; Ambient temperature;

methylmagnesium bromide 1.) THF, from 20 deg C to 30 deg C, 1 h, 2.) THF, toluene, 100 deg C, 1 h, 3.) toluene, 110 deg C, 20 h; Yield given. Multistep reaction;