1: 3-bromo-2-(p-hydroxyphenyl) propionic acid; 2-bromo-3-(p-hydroxyphenyl)propanoic acid With potassium carbonate in N,N-dimethyl-formamide T=65°C; 1 h; Heating / reflux; 2: acetic anhydride in N,N-dimethyl-formamide T=65°C; 0.25 h; Heating / reflux;

potassium carbonate in N,N-dimethyl-formamide T=60°C; 0.833333 h; Heating / reflux; Product distribution / selectivity;