potassium fluoride; 18-crown-6 ether in acetonitrile T=22°C; 3.5 h;

1: 58 percent / manganese(IV) oxide / CH2Cl2 / 6 h / Heating 2: 82 percent / KF; 18-crown-6 / acetonitrile / 3.5 h / 22 °C View Scheme

1.1: Mg / tetrahydrofuran / 20 °C 1.2: 91 percent / tetrahydrofuran / 0.33 h / -18 °C 2.1: 58 percent / manganese(IV) oxide / CH2Cl2 / 6 h / Heating 3.1: 82 percent / KF; 18-crown-6 / acetonitrile / 3.5 h / 22 °C View Scheme

1: formaldehyd; 2'-bromoacetophenone With dimethylammonium chloride; hydrogen cation in ethanol 2 h; Heating; 2: With sodium hydroxide in water 3: nitromethane With N-benzyl-trimethylammonium hydroxide 2 h; Heating;