potassium carbonate in acetone 3 h; Heating;

1: 2,2,6-trimethyl-4H-1,3-dioxin-4-one With dihydroxy-poly(ethylene glycol) of MW = 4000 in toluene 5 h; Heating; 2: α-(3-Hydroxyphenoxy)acetophenone With titanium tetrachloride in tetrahydrofuran T=20°C; von Pechmann reaction; 0.5 h;

titanium tetrachloride T=20°C; Pechmann condensation; 0.0194444 h;