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;