1: 4-amino-2-chloro-benzoic acid With hydrogen bromide in water T=120°C; 1 h; 2: BrH*C7H6ClNO2 With sodium nitrite in water T=5°C; 3: C7H4ClN2O2(1+) With hydrogen bromide; copper(I) bromide in water T=0°C; Heating / reflux;