Reactivity of co-ordinated ligands. Part XIV. The reactions of some cyclo-octa-1,3,5-triene complexes of cobalt(I), 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. 23,p. 2668-2675
- https://doi.org/10.1039/dt9720002668
Abstract
The cyclo-octa-1,3,5-triene (cotr) complexes [(cotr)MCl]2, (cotr)M(π-cp) and (cotr)M(acac)(M = RhI or IrI) have been prepared and some of their reactions examined. Protonation of cotrM-(π-cp)(M = CoI, RhI, or IrI) readily leads to cations of the type [(C8H11)M(π-cp)]+. The C8H11 + entity adopts a variety of bonding modes and interconversion between these various modes readily occurs. Kinetics of such interconversions for both the RhI and IrI cations have been followed by the change in their 1H n.m.r. spectra with time. Possible mechanisms are discussed. Nucleophilic addition to these cations gives the expected neutral complexes of formula (C8H11Y)M(π-cp), the nature of these products depending on the reaction temperature employed. The rhodium complex, (C8H10)Rh(π-cp), does not react cleanly with any of the other electrophiles tried (AcCl–AlCl3 or DMF–POCl3).Keywords
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