(eta(6)-Arene)tricarbonylchromium and (eta(5)-cyclohexadienyl)tricarbonylmanganese complexes: indirect nucleophilic substitutions

Treatment of X-substituted (eta(6)-arene) tricarbonylchromium complexes wit h a nucleophile and a proton source afforded new arenetricarbonylchromium c omplexes via chromium hydride intermediates and elimination of HX (cine and tele nucleophilic aromatic substitutions). Treatment of (eta(5)-X-substitu ted-cyclohexadienyl)tricarbonyl manganese complexes with hydride and a prot on source gave eta(5)-cyclohexadienyl complexes resulting from a cleavage o f the C-X bond: the eta(3)-X-substituted cyclohexenyl intermediates underwe nt elimination of an agostic hydrogen and the X group. (C) 1998 Elsevier Sc ience S.A. All rights reserved.