Dedicated to Professor Roland Boese on the occasion of his 60th birthday
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Syntheses, Structures and Electronic Properties of Cationic Hydroxy- and Methoxy-Substituted Tricarbonyl(tetracyclopropylcyclopentadienyl)iron Complexes†
Article first published online: 25 OCT 2005
DOI: 10.1002/ejoc.200500436
Copyright © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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How to Cite
Emme, I., Labahn, T. and de Meijere, A. (2006), Syntheses, Structures and Electronic Properties of Cationic Hydroxy- and Methoxy-Substituted Tricarbonyl(tetracyclopropylcyclopentadienyl)iron Complexes. Eur. J. Org. Chem., 2006: 399–404. doi: 10.1002/ejoc.200500436
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Publication History
- Issue published online: 2 JAN 2006
- Article first published online: 25 OCT 2005
- Manuscript Received: 16 JUN 2005
- Abstract
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Keywords:
- Small rings;
- Carbonyl compounds;
- Iron complexes;
- Structural data;
- Cations
Abstract
Tetracyclopropylcyclopentadienone, upon liberation from its previously known tricarbonyliron complex 3, undergoes rapid [4+2] cyclodimerization to the highly congested1,2,4,5,6,7,8,9-octacyclopropyltricyclo[5.2.1.02,6]deca-4,8-diene-3,10-dione (6) which was characterized by an X-ray crystal structure analysis. Upon alkylation of 3 with Me3OBF4 as well as protonation with HBF4 or CF3SO3H, the remarkably stable cationic tricarbonyl(tetracyclopropylcyclopentadienyl)iron complexes 9, 10 and 11, 12, respectively, were obtained in high yields (91, 87 and 74, 79 %, respectively). X-ray crystal structural data for 11 and 12 as well as NMR- and IR spectroscopic evidences for all four new complexes 9–12 indicate that their positive charge predominantly rest on the tricarbonyliron fragments. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)