1: 80 percent / BF3*Et2O / CH2Cl2 / 2 h / 20 °C 2: 96 percent / aq. KH2PO4; aq. Na2HPO4; TEMPO / aq. NaOCl; aq. NaClO2 / acetonitrile / 12 h / 45 °C View Scheme

boron trifluoride diethyl etherate in dichloromethane T=20°C; 2 h;