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DOI: 10.1039/A702978K (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 3465-3469

Organometallic synthesis in ambient temperature chloroaluminate(III) ionic liquids. Ligand exchange reactions of ferrocene

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Paul J. Dyson, Martin C. Grossel, Narmatha Srinivasan, Tracey Vine, Thomas Welton, David J. Williams, Andrew J. P. White and Theodore Zigras

Abstract

The ambient temperature ionic liquid system [bmim]Cl–AlCl3 (where [bmim]+ = 1-butyl-3-methylimidazolium cation) has been used to prepare a number of arene(cyclopentadienyl)iron(II) complexes of the type [Fe(C5H5)(arene)]+ from ferrocene. The ionic liquid acts as both solvent and Lewis acid source ([Al2Cl7]–). The products were only formed on addition of a proton source, [bmim][HCl2], confirming mechanistic formulations involving a combination of Lewis and Brønsted acid activity. The X-ray crystal structure analysis of [Fe(η5-C5H5)(η6-C6H5C6H4Br)][PF6] is also reported. The structure clearly shows both π–π stacking interactions between neighbouring cations and hydrogen bonds between the cations and anions.

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