1.1: n-butyllithium; diisopropylamine / hexane; tetrahydrofuran / 0.5 h / -78 °C / |Inert atmosphere 1.2: 3 h / -78 °C / |Inert atmosphere 2.1: zirconocene dichloride / dichloromethane; tetrahydrofuran / 8 h / 0 - 23 °C / |Inert atmosphere 3.1: potassium hydroxide; water / methanol / 24 h / 80 °C / |Inert atmosphere View Scheme