para-Nitroso-N,N-dimethylaniline reacts with tetracyanoethylene to give [4-(dimethylamino)phenylimino]malononitrile N-oxide 1 (65%) in addition to [4-(dimethylamino)phenylimino]malononitrile 2 (17%). The structures of the products are confirmed by spectral data and chemical transformations.