tetrafluoroboric acid; mercury(II) oxide in tetrahydrofuran Ambient temperature;

dihydrogen peroxide; acetic acid 0.5 h; Heating;

1: pyridine / acetonitrile / 0.5 h / Ambient temperature 2: 95 percent / HgO, 35percent aq. tetrafluoroboric acid / tetrahydrofuran / Ambient temperature View Scheme

1: tetrafluoroboric acid/ether complex / acetonitrile 2: pyridine / acetonitrile / 0.5 h / Ambient temperature 3: 95 percent / HgO, 35percent aq. tetrafluoroboric acid / tetrahydrofuran / Ambient temperature View Scheme

1: tetrafluoroboric acid/ether complex / acetonitrile 2: pyridine / acetonitrile / 0.5 h / Ambient temperature 3: 95 percent / HgO, 35percent aq. tetrafluoroboric acid / tetrahydrofuran / Ambient temperature View Scheme

1: tetrafluoroboric acid/Et2O complex / 1.) 105 deg C to 110 deg C, 10 min, 2.) RT, 20 min 2: 100 percent / pyridine / acetonitrile / 0.17 h / Ambient temperature 3: 100 percent / 36percent H2O2, acetic acid / 0.5 h / Heating View Scheme