1.1: sodium hydride / tetrahydrofuran; mineral oil / 1.32 h / 0 - 40 °C 1.2: 20 - 40 °C 2.1: cyclohexane; hexane / 3.25 h / 10 - 20 °C 3.1: lithium diisopropyl amide / tetrahydrofuran / 1 h / -15 °C 3.2: 1.5 h / -15 °C 3.3: 0.42 h / 10 - 20 °C / pH 2 - 4 4.1: N-bromosuccinmide / toluene; ethanol / 1.5 h / 40 °C 5.1: pyridine / tetrahydrofuran / 1.5 h / 40 °C 6.1: water; tetrahydrofuran / 2.5 h / 60 °C View Scheme