1: NaH / 1,2-dimethoxy-ethane / 3 h / 80 °C 2: aq. NaOH / tetrahydrofuran / 1.5 h / 80 °C View Scheme

1: NaH / 1,2-dimethoxy-ethane / 3 h / 80 °C 2: aq. NaOH / tetrahydrofuran / 1.5 h / 80 °C 3: 21.3 g / various solvent(s) / 24 h / 110 °C View Scheme

1: NaH / 1,2-dimethoxy-ethane / 3 h / 80 °C 2: aq. NaOH / tetrahydrofuran / 1.5 h / 80 °C 3: 5.64 g / various solvent(s) / 24 h / 115 °C 4: 5percent NaOH / ethanol / 4 h / 80 °C View Scheme