Amino Di-methyl Aniline

Di-amino derivatives of the secondary amines, mono-methyl aniline, and the tertiary amines, di-methyl aniline, are also known. Of these compounds the para-amino di-methyl aniline is the most important in the dyestuff industry. Tri-amino, tetra-amino, penta-amino and hexa-amino derivatives of benzene and also penta-amino toluene are all known. 

Relation to Dyes.— The amino derivatives of benzene and its homo-logues, which we have been discussing (pp. 539, etc.), form an especially important group of compounds in connection with the manufacture of synthetic dyes. Some of the compounds are themselves dyes while others are intermediate products in the preparation of dyes. When we consider aU of the various forms in which the amino group may be present and the different relations which it may have to the benzene ring we can not fail to realize the vast possibilities in the preparation of dyes and the industrial importance of these amino compounds. 

Among the nitrogen compounds of benzene we have also those intermediate compounds formed in the reduction of nitro benzene to aniline (p. 535). These are as follows  

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This compound crystallizes in beautiful large green leaves, melting point 85°. By reduction it goes to para-amino di-methyl aniline, and by oxidation to para nitro di-methyl aniline. 

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