1: sodium methylate / methanol / 12.5 h / 20 °C / Reflux 2: sodium amalgam; disodium hydrogenphosphate / methanol / 24 h / Inert atmosphere View Scheme

1: in tetrahydrofuran; hexane 144 h; Reflux; 2: With sodium ethanolate in tetrahydrofuran; hexane 12 h; Reflux;