Reactivity of co-ordinated ligands. Part XIII. Electrophilic substitution reactions of cyclohexa-1,3-diene complexes of rhodium(I) and iridium(I)
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 19,p. 2084-2089
- https://doi.org/10.1039/dt9720002084
Abstract
Protonation and deuteriation studies were carried out on complexes (cyclohexa-1,3-diene)(π-cyclopentadienyl)MI where M = Rh or Ir. In acid media proton exchange was shown to occur at the endo-methylene positions of the cyclohexadiene ligand via interaction with the metal. Reaction with Ph3CBF4 formed co-ordinated cyclohexadienium cations which were susceptible to nucleophilic attack to form the exo-derivatives. Acetylation of the rhodium complex yielded the product of acetyl substitution on the π-cyclopentadienyl ring. Acid solutions of this complex exhibited proton exchange both with the endo-hydrogens of the co-ordinated cyclohexadiene and with the hydrogens at the 2,3,4, and 5 positions of the substituted π-cyclopentadienyl ligand.Keywords
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