Transition Metal Complexes of NHC Ligands Functionalized with the Cationic (η<sup>5</sup>‐Cyclopentadienyl)(η<sup>6</sup>‐phenyl)iron(II) Motif
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- Christian Malchau
- Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 54 67663 Kaiserslautern
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- Daniela V. Fries
- Fachbereich Chemie and Research Center OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 52 67663 Kaiserslautern
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- Yannick Mees
- Fachbereich Chemie and Research Center OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 52 67663 Kaiserslautern
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- Marisa F. Jakobs
- Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 54 67663 Kaiserslautern
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- Yu Sun
- Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 54 67663 Kaiserslautern
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- Sabine Becker
- Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 54 67663 Kaiserslautern
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- Gereon Niedner‐Schatteburg
- Fachbereich Chemie and Research Center OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 52 67663 Kaiserslautern
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- Werner R. Thiel
- Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 54 67663 Kaiserslautern
抄録
<jats:title>Abstract</jats:title><jats:p>Starting from [(η<jats:sup>5</jats:sup>‐cyclopentadienyl)(η<jats:sup>6</jats:sup>‐phenyl)iron(II)]imidazole, dicationic imidazolium salts were prepared by <jats:italic>N</jats:italic>‐alkylation. Reaction of these compounds with basic metal precursors such as mesityl copper(I) or palladium(II) acetate led to mono respectively dicationic transition metal NHC complexes (NHC=<jats:italic>N</jats:italic>‐heterocyclic carbene). Transmetalation using the copper(I) complexes opened up the access to NHC gold(I) compounds. PEPPSI‐type NHC complexes of palladium(II) and platinum(II) were prepared by offering a neutral pyridine ligand to the transition metal center. A rhodium(I) NHC complex was accessible by deprotonation of the dicationic imidazolium precursor and subsequent treatment with [(COD)Rh(μ<jats:sup>2</jats:sup>‐Cl)]<jats:sub>2</jats:sub> (COD=1,5‐cyclooctadiene). The new NHC complexes were investigated by means of NMR spectroscopy, mass spectrometry as well as single crystal X‐ray structure analysis. Both, the palladium(II) containing PEPPSI‐type and the gold(I) complex, were investigated for their catalytic properties in typical model reactions such as cyclization reactions, Suzuki coupling and cyanation. In addition, a selenium adduct was synthesized in order to study the electronic properties of the underlying ligand backbone. Based on the chemical shift in the <jats:sup>77</jats:sup>Se NMR spectrum, it is evident that these NHC ligands possess rather poor π‐acidity.</jats:p>
収録刊行物
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- European Journal of Inorganic Chemistry
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European Journal of Inorganic Chemistry 2022 (16), 2022-05-17
Wiley
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キーワード
詳細情報 詳細情報について
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- CRID
- 1360017289282819584
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- ISSN
- 10990682
- 14341948
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- データソース種別
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- Crossref