Introduction In the past 30 years a number of neutral and cationic $-arene complexes of cobalt'have been synthesized in which the arene is benzene, an alkylated benzene, or an annelated arene. However, only a few examples of arene-cobalt complexes are known where the arene ligands bear functional groups. 2 In this paper we wish to report some novel cationic and neutral arene-cobalt complexes (1)(a) Silverhorn, WE Adv. ...