1: 70 percent / tert-butyl hydroperoxide; n-butyllithium / tetrahydrofuran; toluene; hexane / 2 h / -20 - -10 °C 2: 82 percent / LiOtBu / dimethylsulfoxide; tetrahydrofuran / 2 h / 25 °C 3: 97 percent / KOtBu / tetrahydrofuran / 2 h / 25 °C View Scheme

tBuOOLi in tetrahydrofuran T=-78 - 20°C; 24 h;

1: 70 percent / tert-butyl hydroperoxide; n-butyllithium / tetrahydrofuran; toluene; hexane / 2 h / -20 - -10 °C 2: 82 percent / LiOtBu / dimethylsulfoxide; tetrahydrofuran / 2 h / 25 °C View Scheme