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A novel and efficient procedure was developed for the preparation of diaminotriarylmethanes through the Baeyer condensation of aromatic aldehydes and N,N-dimethylaniline or N,N-diethylaniline in the presence of niobium chloride under solvent-free conditions. This approach offers several advantages, such as short reaction time, high yields, low cost, and mild reaction conditions. Graphical abstract...
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