Molecular structures of the pentaphenylcyclopentadienyl iron complexes [(C(5)Ph5)Fe(CO)(2)R] (R = Me, Ph, iPr and Bu)

摘要

The Pd-II-catalysed reaction of [(C5Ph5)Fe(CO)(2)Br] with Grignard compounds RMgX or butyl lithium gave the iron alkyl/aryl complexes [(C5Ph5)Fe(CO)(2)R] (R = Me, Ph, iPr and Bu) in 59-73% yield, namely, dicarbonylmethyl(eta(5)-pentaphenylcyclopent adienyl) iron, [Fe(CH3)(C35H25)(CO)(2)], dicarbonyl (eta(5)-pentaphenylcyclopentadienyl) phenyliron, [Fe(C6H5)(C35H25)(CO)(2)], dicarbonyl(isopropyl) (eta(5)-pentaphenylcyclopentadienyl)iron, [Fe(C3H7)(C35H25)(CO)(2)], and butyldicarbonyl(eta(5)-pentaphenylcyclopentadienyl)iron, [Fe(C4H9)(C35H25)-(CO)(2)]. The crystal structure determinations showed the usual 'paddle-wheel' orientation of the phenyl rings, with an average canting angle of ca 50 degrees. The bond parameters are mainly dictated by the steric requirements of the alkyl/aryl groups and only the phenyl complex shows electronic effects.