C4F9SO3H T=165°C; 2 h;

1: 2-Bromo-1,3,5-trimethyl-benzene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; 2: 4-chlorobenzaldehyde in tetrahydrofuran; hexane T=-78 - 20°C; 1 h; 3: With iodine; potassium carbonate in tert-butyl alcohol 18 h; Reflux;

in dichloromethane T=20°C; 4 h;

1: AlCl3 / CH2Cl2 / 14 h / 20 °C 2: 1.80 g / AlCl3 / CH2Cl2 / 5 h / 20 °C View Scheme