Exploring reactivity of a bis-sulfonium zirconocene-ate dimer: Synthesis of various zwitterionic phosphonium anionic zirconocene complexes |
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Authors: | Esteban Ortega |
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Institution: | Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB), UMR CNRS 5260, 9 avenue Alain Savary, BP 47870, 21078 Dijon Cedex, France |
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Abstract: | Formal 3+2] cycloaddition reactions between the bis-sulfonium zirconocene-ate dimer 1a and methylpropiolate, benzaldehyde and carbon disulfide afforded stable zwitterionic phosphonium zirconocene-ate complexes 2-4, respectively, with two orthocondensed five-membered heterocycles. X-ray crystal structure of 4 has been determined. Elemental chalcogens (S, Se, Te) gave rise also to a new variety of five-coordinate zirconium(IV) complexes (5-7) by a formal 3+1] cycloaddition reaction. In these bicyclic zirconates, sulfur is included in a five-membered ring while the second chalcogen is in a four-membered one. |
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Keywords: | Zwitterionic complexes Zirconocene-ate Anionic zirconocene Phosphonium Sulfonium Chalcogens |
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