1.1: n-BuLi / tetrahydrofuran; hexane / 1.08 h / -78 - -30 °C 1.2: tetrahydrofuran; hexane / 12 h / -78 - 20 °C 2.1: tetrahydrofuran; hexane / -78 - 20 °C View Scheme

in tetrahydrofuran; hexane T=-78 - 20°C;