1: 1.) t-BuOK, t-BuLi, 2.) Me3SiCl, 3.) MeLi / 1.) pentane, -10 deg C, 30 min, 2.) THF, -78 deg C, 10 min, 3.) THF, Et2O, -78 deg C, 20 min 2: tetrahydrofuran / 0.17 h / -78 °C View Scheme

in tetrahydrofuran T=-78°C; 0.166667 h;

in 1,4-dioxane; methanol 0.25 h; Heating;