The chemistry of co-ordinated ligands. Part I. Some derivatives of the cyclopentadienyl cyclo-octa-1,5-diene complexes of cobalt and rhodium

Abstract

Cyclopentadienyl(cyclo-octa-1,5-diene)cobalt(I) reacts with 1 mol. of trityl fluoroborate to give the cation C₅H₅CoC₈H₁₁⁺, but cyclopentadienyl(cyclo-octa-1,5-diene)rhodium(I) gives the neutral compound Ph₃C·C₅H₄RhC₈H₁₂, in which the cyclopentadienyl ring has undergone an electrophilic substitution. 2 Mol. of the reagent with C₅H₅RhC₈H₁₂ afford the cation Ph₃C·C₅H₄RhC₈H₁₁⁺. Both cations readily add nucleophiles to give substituted diene complexes. Mass, infrared, ultraviolet, and nuclear magnetic resonance spectra are used to characterise the new compounds.