E4 Butterfly Complexes (E=P, As) as Chelating Ligands. Issue 44 (2nd September 2015)

• Record Type: Journal Article
• Authors: Schwarzmaier, Christoph; Heinl, Sebastian; Balázs, Gábor; Scheer, Manfred
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 44(2015)
• Page Start: 13116
• Page End: 13121
• Publication Date: 2015-09-02
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201506784
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The coordination properties of new types of bidentate phosphane and arsane ligands with a narrow bite angle are reported. The reactions of [{Cp′′′Fe(CO)₂}₂(μ, η^1:1‐P₄)] (<bold>1 a</bold>) with the copper salt [Cu(CH₃CN)₄][BF₄] leads, depending on the stoichiometry, to the formation of the spiro compound [{{Cp′′′Fe(CO)₂}₂(μ₃, η^1:1:1:1‐P₄)}₂Cu]⁺[BF₄]⁻ (<bold>2</bold>) or the monoadduct [{Cp′′′Fe(CO)₂}₂(μ₃, η^1:1:2‐P₄){Cu(MeCN)}]⁺[BF₄]⁻ (<bold>3</bold>). Similarly, the arsane ligand [{Cp′′′Fe(CO)₂}₂(μ, η^1:1‐As₄)] (<bold>1 b</bold>) reacts with [Cu(CH₃CN)₄][BF₄] to give [{{Cp′′′Fe(CO)₂}₂(μ₃, η^1:1:1:1‐As₄)}₂Cu]⁺[BF₄]⁻ (<bold>5</bold>). Protonation of <bold>1 a</bold> occurs at the "wing tip" phosphorus atoms, which is in line with the results of DFT calculations. The compounds are characterized by spectroscopic methods (heteronuclear NMR spectroscopy and IR spectrometry) and by single‐crystal X‐ray diffraction studies.</p> </abstract>