Tetra methyldiaminobenzophenone

Dimethylaniline is also used for the preparation of tetra-methyldiaminobenzophenone(Michler s compound), which forms the basis of many colouring matters, and is obtained by acting upon dimethylaniline with phosgene (see p. 314))... 

The alkylation process enters into dye manufacture in two ways, because dyes may be formed from alkylated intermediates, or in a lesser numt>er of instances, an intermediate may be subjected to alkylation as a final step. For instance, dimethylaniline is condensed with phosgene to give tetra-methyldiaminobenzophenone (Michler s ketone). From this ketone are formed many dyes, such as crystal violet and Victoria blue. On the other hand, the alkylation process may be almost the last step in the manufacture of a dye, for example, when the disazostilbene dye, paper yellow 3G, is ethylated to give crysophenine G. 

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See also in sourсe #XX -- [ ]

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