A novel efficient method for the synthesis of diaminotriphenylmethanes (DTMs) in high yield through one-step condensation of arylaldehydes and N,N-dimethylaniline catalyzed by polymer-supported sulfonic acid (NKC-9) is described. This method offers the advantages of mild reaction condition, simplicity and reuse of the catalyst. © 2007 Elsevier Ltd. All rights reserved.
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