N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile in tetrachloromethane

1: 2,4-dichloro-6-methylbenzoic acid; 2,4-Dichloro-3-methyl-benzoic acid With oxalyl dichloride; N,N-dimethyl-formamide in dichloromethane T=0°C; 1 - 2 h; 2: methanol 16 h; 3: With N-bromosuccinmide; dibenzoyl peroxide in tetrachloromethane 5 h; Heating / reflux;

N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile in tetrachloromethane

hydrogen bromide; dihydrogen peroxide in chlorobenzene