Add time:08/09/2019         Source:sciencedirect.com

Starting from 4-chloro- or 4-fluoroaniline, the four reaction steps — diazotization, coupling with imidazole, quaternization with dimethyl sulphate and substitution with dialkylamines, piperidine derivatives or hexamethyleneimine — were carried out as a one-pot preparation of 1,3-dimethyl-2-[4-(N,N-disubstitutedamino)phenylazo]imidazolium cationic dyes. The reaction procedure shortened considerably the overall reaction time and avoided some technical operations, such as filtration and drying.

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