Rare-earth amidate complexes. Easily accessed initiators for epsilon-caprolactone ring-opening polymerization

Inorganic Chemistry
Louisa J E StanlakeLaurel L Schafer

Abstract

The direct synthesis of yttrium amidate complexes using the simple reaction of amide proligands and Y(N(SiMe3)2)3 results in the high-yielding preparation and isolation of crystalline, monomeric materials. The complex, tris(N-2',6'-diisopropylphenyl(naphthyl)amidate)yttrium mono(tetrahydrofuran) (4), was structurally determined to be a 7-coordinate C1 symmetric structure, maintaining one bound tetrahydrofuran molecule. Compound 4 (C12H17[NCO]C10H7)3Y(C4H8O) crystallized in the monoclinic space group P2(1)/c with a = 13.7820(11) A, b = 33.598(3) A, c = 16.0575(12) A, alpha = 90 degrees, beta = 98.762(3) degrees, gamma = 90 degrees, Z = 4. Solution phase NMR spectroscopic characterization of this same complex showed a highly symmetric species, consistent with a fluxional coordination environment for these compounds. Preliminary studies into the initiation of epsilon-caprolactone ring-opening polymerization using these complexes indicate high activity, producing high molecular weight polymer.

References

Oct 24, 2001·The Journal of Organic Chemistry·Hugo E. GottliebAbraham Nudelman
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Citations

Jul 7, 2012·Journal of the American Chemical Society·Insun YuParisa Mehrkhodavandi
Aug 8, 2015·Accounts of Chemical Research·Scott A Ryken, Laurel L Schafer
Apr 21, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Chao GongYingming Yao
Nov 28, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Luis G AlvesAna M Martins
May 22, 2009·Journal of Gastrointestinal Surgery : Official Journal of the Society for Surgery of the Alimentary Tract·Jeffery A ReeseRobert C Moesinger
May 5, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Jaclyn A Thomson, Laurel L Schafer
Jul 5, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Rashidat O Ayinla, Laurel L Schafer
Nov 21, 2012·Chemical Communications : Chem Comm·Ruth L WebsterLaurel L Schafer
Sep 21, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Philippa R PayneLaurel L Schafer
Apr 7, 2020·Journal of the American Chemical Society·Christopher Jeffrey BargerTobin J Marks
Nov 17, 2017·Inorganic Chemistry·Mrinal BhuniaSwadhin K Mandal
Nov 18, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Andrey Y Khalimon

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