An Exceptionally Stable Ti Superoxide Radical Ion: A Novel Heterogeneous Catalyst for the Direct Conversion of Aromatic Primary Amines to Nitro Compounds The authors are thankful to Dr. Devotta and the Director, NCL for their constant encouragement. Three of us (G.K.D., M.D.N., and I.S.A.) also thank CSIR for the award of an Senior Research Fellowship (SRF). Suggestions from the referees are highly appreciated.