The carbanion of chloromethyl aryl sulfone reacts with 1-cyanonaphthalene to form a bis-annulated product whereas with 1-nitronaphthalene vicarious nucleophilicsubstitution of hydrogen takes place. This result and the bis-annulation of quinoxalines and naphthyridines which was reported earlier are rationalized in terms of the negative charge delocalization in the intermediate σ-adducts.