potassium hydroxide in ethylene glycol dimethyl ether T=8°C; 0.5 h;

1: 84 percent / p-toluenesulfonic acid / ethane-1,2-diol; H2O / 8 h / Heating 2: 37 percent / 2percent Pd/C / diphenyl ether / 2 h / Heating 3: 85 percent / KOH / 1,2-dimethoxy-ethane / 0.5 h / 8 °C View Scheme

1: 37 percent / 2percent Pd/C / diphenyl ether / 2 h / Heating 2: 85 percent / KOH / 1,2-dimethoxy-ethane / 0.5 h / 8 °C View Scheme