1.1: n-BuLi / tetrahydrofuran / 0.5 h / -78 °C 1.2: 69 percent / tetrahydrofuran / 0.33 h 2.1: 40 percent / m-CPBA; K2CO3 / acetone / 6.5 h / -78 - 20 °C 3.1: 90 percent / t-BuOOH; NaH / tetrahydrofuran; various solvent(s) / 4.5 h / -30 °C 4.1: 5 mg / tetrahydrofuran / 0.92 h / -78 °C View Scheme

dihydrogen peroxide; ammonium chloride in tetrahydrofuran T=50°C; 48 h;

aluminum oxide; Oxonereg;