1: 1-[(Methylethyl)thio]-4-fluorobenzene With n-butyllithium in tetrahydrofuran; hexane T=-85°C; Metallation; 6 h; 2: methyl iodide in tetrahydrofuran; hexane T=20°C; Methylation; 3 h; Title compound not separated from byproducts;

sulfuric acid 1) 0 to 10 deg C, 2) RT, overnight; Yield given. Multistep reaction;

sulfuric acid