Aromatic aldimines, aldoximes and aldehydes can be converted to the corresponding carboxylic acid on reaction with catalytic amount of cis-bisglycinato copper(II) monohydrtae in the presence of copper(II) catalyst. The reactions are facilitated by addition of polyaniline as support. In the case of aldimines, evidences on participation of self-generated polyaniline is observed. The mechanistic aspect involving an oxy radical attached to copper(II) is presented with ESR evidence. (C) 2002 Elsevier Science B.V. All rights reserved.