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Synthesis of cationic (arene)IronCp complexes via arene exchange

Jeger, Patrick
Published in Inorganica Chimica Acta. 2004, vol. 357, no. 6, p. 1909-1919
Abstract Rates and regioselectivity of arene exchange reactions in cationic fused arene Fe(II)Cp complexes were investigated. Thermal exchange of pyrene, naphthalenes, and cyclooctatetraene occurs in the temperature range of 90–140 °C. The most labile complex in the series studied is [(?6-(1-4,4a,8a)-1,4-dimethoxynaphthalene)FeCp][PF6] having the FeCp coordinated to the substituted ring. Pyrene and other naphthalene complexes come next, followed by the cyclooctatetraene complex. Phenanthrene, veratrol, and dihydronaphthalene do not undergo exchange at temperatures up to 130 °C. With Me- and OMe-substituted naphthalenes, exchange is reversible and favors the product having the metal coordinated to the non-substituted ring. The X-ray crystal structures of the two regioisomeric 1,4-dimethoxynaphthalene complexes were determined. Arene exchange in fused arene complexes is shown to be a useful synthetic method and provides new arene complexes cleanly and efficiently. The method is particularly attractive for arenes that contain functionalities that are not compatible with the Lewis acid-mediated routes. The starting materials are readily accessible via the TiCl4-assisted Cp exchange in ferrocene. Thermal arene exchange reactions in (fused arene)Fe(II)Cp+ complexes occur readily at 100–140 °C with high product yield. The most reactive complex investigated is [(?6-(1-4,4a,8a)-1,4-dimethoxynaphthalene)FeCp][PF6]. The synthetically most useful starting materials are the complexes [(pyrene)FeCp][PF6] and [(naphthalene)FeCp][PF6]. Both are readily obtained from ferrocene using TiCl4 as promoter.
Keywords Arene complexesArene exchangeIron Cp complexesNaphthalene
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KUNDIG, Ernst Peter, JEGER, Patrick, BERNARDINELLI, Gérald Hugues. Synthesis of cationic (arene)IronCp complexes via arene exchange. In: Inorganica Chimica Acta, 2004, vol. 357, n° 6, p. 1909-1919. https://archive-ouverte.unige.ch/unige:7921

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Deposited on : 2010-06-21

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