1: 2C9H13O5(1-)*Mg(2+) With sodium hydride in tetrahydrofuran; paraffin oil T=20°C; 0.5 h; 2: ethyl iodide With hydrogenchloride in tetrahydrofuran 24 h;

1.1: triethylamine; magnesium chloride / benzene / 1.5 h / |Reflux 2.1: sodium hydride / tetrahydrofuran; paraffin oil / 0.5 h / 20 °C 2.2: 24 h View Scheme

ethanol; sodium ethanolate Kochen;