1.1: lithium hexamethyldisilazane / tetrahydrofuran; cyclohexane / 1 h / -78 °C / Inert atmosphere 1.2: 1 h / -78 - 20 °C / Inert atmosphere 2.1: potassium tert-butylate / tetrahydrofuran / 0.33 h / -78 °C / Inert atmosphere 3.1: toluene / 1 h / 60 °C / Inert atmosphere View Scheme