| abstract |
The invention relates to a process for obtaining 2-bromine-4,6-dinitrochlorobenzene from chlorobenzene previously treated with a mixture of sulfuric and nitric acids or from individual o-, p-nitrochlorobenzenes or of a eutectic mixture of o-, p-, m-nitrochlorobenzenes, any of the said substances being treated at a temperature between 20 and 120 ° C with bromine or with an alkali metal bromide, using nitric acid or nitrate of an alkali metal and sulfuric acid or oleum with the following molar ratio of reactants: the initial substance: bromine or a bromide of an alkali metal: nitric acid or nitrate of a alkali metal: sulfuric acid or oleum equivalent to 1.0: 0.5 to 1.5 or 1.0 to 3.0: 2.0 to 4.0 or 2.5 to 5.0: 6.0 to 70 , 0. |