Bimetallic complexes with ruthenium and tantalocene moieties: Synthesis and use in a catalytic cyclopropanation reaction |
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Authors: | Jé rô me Goux,Philippe Richard |
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Affiliation: | Laboratoire de Synthèse et Electrosynthèse Organométalliques, LSEO-UMR 5188, Université de Bourgogne, Faculté des Sciences Mirande, 9 avenue Alain Savary, 21000 Dijon, France |
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Abstract: | The reaction of the tantalocene dichloride monophosphines (1-2) with the binuclear complex [(p-cymene)RuCl2]2 gives the heterobimetallic compounds (p-cymene)[(η5-C5H5)(μ-η5:η1-C5H4(CH2)2PR2)TaCl2]RuCl2 (3-4). The air oxidation of these bimetallic species 3-4, leads to the cationic hydroxo tantalum ruthenium derivatives 5-6. The last ones are easily deprotonated by a base to afford the oxo analogues 7-8. A preliminary assessment in catalytic cyclopropanation of styrene with tantalum ruthenium bimetallic complexes 3-8 as precatalysts revealed a cooperative effect with a subtle role of the early metal fragment. |
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Keywords: | Tantalum Ruthenium Heterobimetallic complexes Cyclopropanation |
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