hydrogenchloride in tetrahydrofuran 264 h;

methanol; toluene-4-sulfonic acid T=20°C; 10 h;

1: barium hydroxide octahydrate / methanol / 2 h / 50 °C 2: p-toluenesulfonic acid / methanol / 15 h / Ambient temperature View Scheme

1: 100 percent / pyridinium p-toluenesulfonate / CH2Cl2 / 1.5 h / Ambient temperature 2: barium hydroxide octahydrate / methanol / 2 h / 50 °C 3: p-toluenesulfonic acid / methanol / 15 h / Ambient temperature View Scheme

sodium hydroxide in ethanol; water

sodium hydroxide

1: 1,5-bis(4-hydroxyphenyl)penta-1,4-dien-3-one With potassium carbonate in N,N-dimethyl-formamide T=90°C; Williamson aryl-alkyl-ether synthesis; 2: 2-chloro-ethanol in N,N-dimethyl-formamide T=90°C; Williamson aryl-alkyl-ether synthesis; 24 h;