2784-92-1Relevant academic research and scientific papers
Process for preparing N,N'-disubstituted nitro-para-phenylenediamines, N,N'-disubstituted nitro-para-phenylenediamines, and intermediate oxazolidones
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, (2008/06/13)
The present invention relates to a process for preparing a N,N'-disubstituted nitro-para-phenylenediamine (I) according to the following scheme: STR1 X denoting a halogen and R a lower alkyl, lower mono- or polyhydroxyalkyl, lower alkoxyalkyl or lower aminoalkyl group, in which the amino group can be mono- or disubstituted with a lower alkyl or lower mono- or polyhydroxyalkyl group, the nitrogen atom of said amino group being able to form part of a heterocyclic system. The invention also relates to the intermediate oxazolidones of formulae (II) and (III), and the new nitro-para-phenylenediamines in which R denotes a lower alkoxyalkyl, lower polyhydroxyalkyl or lower aminoalkyl group, as well as the dyeing compositions for keratinous fibres containing these new nitro-para-phenylenediamines.
