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

Autor:	Xavier F. Le Goff, Pascal Le Floch, Charlotte K. Williams, Audrey Auffrant, Antoine Buchard, Rachel H. Platel
Rok vydání:	2010
Předmět:	chemistry.chemical_classification Steric effects Lactide Ligand Organic Chemistry Iodide Dispersity chemistry.chemical_element Photochemistry Neodymium Inorganic Chemistry chemistry.chemical_compound chemistry Polymerization Polymer chemistry Alkoxide Physical and Theoretical Chemistry
Zdroj:	Organometallics. 29:2892-2900
ISSN:	1520-6041 0276-7333
Popis:	Bis(iminophosphoranyl)methanide ({CH(PPh2NR)}−, R = iPr or Ph) neodymium(III) complexes were prepared from NdI3(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(PPh2NiPr)2}{CH(PPh2N...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9c8b533014d4db6995add2f252072b4d https://doi.org/10.1021/om1001233 Zobrazit plný text záznamu