The invention relates to BOC-4, 4apos; preparation method of-dinitrodiphenylamine

The invention provides a preparation method of BOC-4, 4 '-dinitrodiphenylamine, which comprises the following steps: step 1, adding an organic solvent into a reaction kettle, and then adding 4, 4'-dinitrodiphenylamine, a catalyst and an acid-binding agent into the reaction kettle; raising the temperature to a first temperature; step 2, dividing BOC anhydride into two parts, mixing the first part of BOC anhydride with an organic solvent to form a mixed solution, dropwise adding the mixed solution into a reaction kettle, and carrying out heat preservation reaction for t1 time; dropwise adding a mixed solution formed by mixing the residual BOC anhydride and the organic solvent into the reaction kettle, and carrying out heat preservation reaction for t2 time; then distilling until the solvent in the reaction kettle is evaporated to dryness; 3, adding a crystallization solvent, and heating to a second temperature; cooling to a third temperature, and continuously stirring the reaction kettle to crystallize the prod