potassium tert-butylate in N,N-dimethyl-formamide T=-40 - -30°C;

1: 4-chloro-methylsulfonylbenzene; 1-chloro-4-nitro-benzene With sodium hydride in dimethyl sulfoxide T=20°C; 2 h; 2: methyl iodide in dimethyl sulfoxide 0.5 h; Further stages.;

potassium tert-butylate in N,N-dimethyl-formamide T=-40 - -30°C;

18-crown-6 ether; potassium carbonate in acetonitrile Heating;