manganese(IV) oxide in toluene Heating;

1: 60 percent / KF, dimethylsulfone 2: n-butyllithium, diisopropylamine / tetrahydrofuran; hexane / 1.) 0 deg C, 1 h, 2.) -75 deg C, 2 h 3: tetrahydrofuran / 2 h / -75 °C 4: 90 percent / manganese dioxide / toluene / Heating View Scheme

1: n-butyllithium, diisopropylamine / tetrahydrofuran; hexane / 1.) 0 deg C, 1 h, 2.) -75 deg C, 2 h 2: tetrahydrofuran / 2 h / -75 °C 3: 90 percent / manganese dioxide / toluene / Heating View Scheme

1: tetrahydrofuran / 2 h / -75 °C 2: 90 percent / manganese dioxide / toluene / Heating View Scheme