Phosphorus stabilized carbene complexes: bisphosphonate dianion synthesis, reactivity and DFT studies of O~C~O zirconium(IV) complexes

The reactivity of the geminal dianion of tetraisopropyl methylenediphosphonate, 3, with [ZrCl4(THF)2] affords a trinuclear structure 5 in which an unprecedented triscarbene-Zr dianionic fragment is found. The overall trinuclear arrangement is assembled by PO bridging moieties. The X-ray crystal stru...

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Veröffentlicht in:Dalton transactions : an international journal of inorganic chemistry 2010-01, Vol.39 (2), p.492-499
Hauptverfasser: Heuclin, Hadrien, Grünstein, Dan, Le Goff, Xavier-Frederic, Le Floch, Pascal, Mézailles, Nicolas
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container_title Dalton transactions : an international journal of inorganic chemistry
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creator Heuclin, Hadrien
Grünstein, Dan
Le Goff, Xavier-Frederic
Le Floch, Pascal
Mézailles, Nicolas
description The reactivity of the geminal dianion of tetraisopropyl methylenediphosphonate, 3, with [ZrCl4(THF)2] affords a trinuclear structure 5 in which an unprecedented triscarbene-Zr dianionic fragment is found. The overall trinuclear arrangement is assembled by PO bridging moieties. The X-ray crystal structure of 5 is presented. The reaction of complex 5 with stoichiometric amounts of pyridine affords a dinuclear complex 6 whose formulation was ascertained by an X-ray crystal structure. Complexes 5 and 6 cleanly react with aldehydes (R1)(H)CO to afford the corresponding olefin of general formula [((OiPr)2P=O)2C=C(R1)(H)]. DFT calculations which were carried out on the model complex of 5t and a hypothetical monometallic Zr complex [Zr(3)Cl2(OMe2)2] 8t indicate that the Zr-C bond only features a weak pi-interaction between the carbon atom and a vacant orbital at the metal. The polarization of the orbital towards the carbon center is consistent with the observed nucleophilic character of the carbene complexes described here.
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Chemical Sciences
title Phosphorus stabilized carbene complexes: bisphosphonate dianion synthesis, reactivity and DFT studies of O~C~O zirconium(IV) complexes
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