Monohaloboryls (BHX−) as Bridging Ligands: Observable Dinuclear σ‐(Halo)boranyl Intermediates in the Synthesis of Metalloborylenes |
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Authors: | Jürgen Bauer Prof Dr Holger Braunschweig Dr Rian D Dewhurst Dr Katharina Kraft Dr Krzysztof Radacki |
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Institution: | Institut für Anorganische Chemie, Julius‐Maximilians‐Universit?t Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49)?931‐31‐84623 |
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Abstract: | Upon treating transition‐metal–dihaloboryl complexes of the form LnMBX2] with K(η5‐C5H5)MnH(CO)2], salt elimination occurs along with a migration of the Mn‐bound hydride ligand onto the boron atom, thereby forming dinuclear σ‐(halo)boranyl complexes of the form LnM(μ‐BHX)Mn(CO)2(η5‐C5H5)]. Most of these complexes react further at room temperature to lose HX and provide metalloborylene complexes LnM‐B=Mn(CO)2(η5‐C5H5)]; however, when MLn=Re(CO)5 the σ‐(halo)boranyl complex decomposes into unidentifiable products. We found through DFT calculations that two electronically and structurally distinct forms of the intermediate σ‐(halo)boranyl complexes exist, one of which easily loses HX and one that does not. |
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Keywords: | boron boryl complexes bridging ligands monohaloboryls transition metals |
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