| abstract |
A method of obtaining 2-bromine-4,6-dinitrochlorobenzene from chlorobenzene preliminarily treated with a mixture of sulphuric and nitric acids or from individual o-, p-nitrochlorobenzenes or from a eutectic mixture of o-, p-, m-nitrochlorobenzenes, any of said substances being treated at a temperature of 20-120C by bromine or bromide of an alkaline metal, by the nitric acid or by nitrate of an alkaline metal and sulphuric acid or oleum in the following molar ratio of the reagents: the initial substance: bromine or a bromide of an alkaline metal: nitric acid or nitrate of an alkaline metal: sulphuric acid or oleum equalling 1.0:0.5-1.5 or 1.0-3.0:2.0-4.0 or 2.5-5.0:6.0-70.0. |