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Mixed (P[DOUBLE BOND]S/P[DOUBLE BOND]O)-Stabilized Geminal Dianion: Facile Diastereoselective Intramolecular C[BOND]H Activations by a Related Ruthenium–Carbene Complex

Authors

  • Hadrien Heuclin,

    1. Laboratoire Hétéroéléments et Coordination, Ecole Polytechnique, CNRS, Route de Saclay, 91120 Palaiseau (France)
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  • Dr. Xavier F. Le Goff,

    1. Laboratoire Hétéroéléments et Coordination, Ecole Polytechnique, CNRS, Route de Saclay, 91120 Palaiseau (France)
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  • Dr. Nicolas Mézailles

    Corresponding author
    1. Laboratoire Hétéroéléments et Coordination, Ecole Polytechnique, CNRS, Route de Saclay, 91120 Palaiseau (France)
    2. Current address: Laboratoire Hétérochimie Fondamentale et Appliquée, Université Paul Sabatier, CNRS, 118 Route de Narbonne, 31062 Toulouse cedex 9 (France), Fax: (+33) 561558204
    • Laboratoire Hétéroéléments et Coordination, Ecole Polytechnique, CNRS, Route de Saclay, 91120 Palaiseau (France)
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Abstract

A new unsymmetrical geminal dianion that contained both a phosphine oxide moiety and a phosphine sulfide moiety has been synthesized. Its reactivity towards RuII was explored, which led to the formation of a highly reactive carbene complex that evolved at room temperature to yield a kinetic orthometalated RuII complex through C[BOND]H activation of the phenyl group of the phosphine oxide moiety. This insertion was found to be thermally reversible and a second C[BOND]H insertion occurred at a phenyl group of the phosphine sulfide moiety to form the thermodynamic orthometalated RuII complex in a diastereospecific manner. DFT calculations fully rationalized the experimental findings in terms of the relative energies of the kinetic and thermodynamic products and allowed the mechanism of this process to be fully understood.

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