New synthetic strategy in organolanthanides chemistry: The "borohydride/alkyl route"

Abstract : In this work, we describe a new synthetic strategy in organolanthanides chemistry, allowing the one-pot preparation of two unprecedented families of heterobimetallic half-lanthanidocenes (Nd, La) and lanthanidocenes of general formula [(CpR)Ln(BH4)3]2[Mg(THF)6] and [(CpR)2Ln(BH4)(m-BH4)]2(Mg(THF)3, respectively (CpR is a cyclopentadienyl ligand). This efficient synthetic approach, that we call the “borohydride/alkyl route”, is based on the employ of the very common trisborohydride derivatives Ln(BH4)3(THF)3, and requires a minimal experimental work-up. We will present the syntheses and X Ray structures of several complexes belonging to this new family, including a very rare example of half-neodymocene bearing just one C5H5 ligand. The isolated complexes afford efficient precatalysts for selective and controlled ethylene, isoprene and styrene polymerization.
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Submitted on : Thursday, March 20, 2008 - 4:31:38 PM
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Marc Visseaux, Philippe Zinck, Michael Terrier, Thomas Chenal, André Mortreux, et al.. New synthetic strategy in organolanthanides chemistry: The "borohydride/alkyl route". 233rd ACS National Meeting, Mar 2007, Chicago, United States. pp.INOR-1258. ⟨hal-00265974⟩

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