1.1: lithium diisopropylamide / hexane; tetrahydrofuran / 0.5 h / -70 - -55 °C 1.2: tetrahydrofuran; hexane / 3 h / -55 - -10 °C 1.3: 67.92 percent / ammonium chloride (satd.) / tetrahydrofuran; hexane / -10 - 20 °C 2.1: 5.5 h / Heating 2.2: 23.3 percent / water / 20 °C View Scheme