1: 1,2,3,4-tetrachlorobenzene; sodium methylate in N,N,N',N',N'',N''-hexamethylphosphoric triamide T=120°C; 3 h; Inert atmosphere; 2: methyl iodide in N,N,N',N',N'',N''-hexamethylphosphoric triamide T=20°C; 1 h; Inert atmosphere;

potassium hydroxide 4 h; Ambient temperature;

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T=120 - 135°C; 19 h;