1: 80 percent / H2SO4, NaNO2, / Na tetrakis<3,5-bis(trifluoromethyl)phenyl>borate (NaTFPB) / CH2Cl2; H2O / 3 h / 0 °C 2: CH2Cl2; H2O / 24 h / Ambient temperature View Scheme

1: 80 percent / H2SO4, NaNO2, / Na tetrakis<3,5-bis(trifluoromethyl)phenyl>borate (NaTFPB) / CH2Cl2; H2O / 3 h / 0 °C 2: CH2Cl2; H2O / 24 h / Ambient temperature View Scheme

in dichloromethane; water 24 h; Ambient temperature;