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Iminophosphorane Neodymium(III) Complexes As Efficient Initiators for Lactide Polymerization

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  • Antoine Buchard
  • Rachel H. Platel
  • Audrey Auffrant
  • Xavier F. Le Goff
  • Pascal Le Floch
  • Charlotte K. Williams
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<mark>Journal publication date</mark>12/07/2010
<mark>Journal</mark>Organometallics
Issue number13
Volume29
Number of pages9
Pages (from-to)2892-2900
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Bis(iminophosphoranyl)methanide ({CH(PPh(2)NR)}(-), R = iPr or Ph) neodymium(III) complexes were prepared from NdI(3)(THF)(3.5). The steric bulk of the ligand controlled the stoichiometry of the resulting complexes. Thus, three new complexes, bearing one or two ancillary ligands, were prepared and characterized using various spectroscopic techniques and by single-Crystal X-ray diffraction. Reaction of the heteroleptic neodymium iodide complexes with amido groups yielded viable initiators for the ring-opening polymerization of lactide. The polymerizations were conducted using either the heteroleptic neodymium amido complexes or the in situ generated alkoxide complexes. Using such conditions, the neodymium complexes showed very fast and well-controlled polymerizations, with complete conversion being obtained in only a few minutes and yielding polylactide with controlled molecular weight and narrow polydispersity index. An initiating system comprising a rare neodymium-alkyl-carbene complex [Nd{C(PPh(2)NiPr)(2)}{CH(PPh(2)NiPr)(2)}] and externally added iPrOH was also an unexpected catalyst for the ROP of lactide.