potassium tert-butylate in tetrahydrofuran T=0°C; 1 h;

1: 91 percent / NaH / tetrahydrofuran / 1 h / 0 °C 2: 76 percent / t-C4H9OK / tetrahydrofuran / 1 h / 0 °C View Scheme

1: 76 percent / CHCl3; dimethylformamide / cathodic reduction 2: 91 percent / NaH / tetrahydrofuran / 1 h / 0 °C 3: 76 percent / t-C4H9OK / tetrahydrofuran / 1 h / 0 °C View Scheme

sulfuric acid in 1,4-dioxane; water Heating;