trimethylsilyl trifluoromethanesulfonate in dichloromethane 5 h; Ambient temperature;

1: 90 percent / 37.5percent NaOH / H2O; benzene / 1 h / Ambient temperature 2: 89 percent / trimethylsilyl triflate / CH2Cl2 / 5 h / Ambient temperature View Scheme

lithium hexamethyldisilazane in tetrahydrofuran T=-78°C; 1 h;