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Metal-Size Influence in Iso-Selective Lactide Polymerization

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اقرأ أكثر حفظ في قائمتي
  • معلومة اضافية
    • Contributors:
      Engineering & Physical Science Research Council (EPSRC)
    • بيانات النشر:
      Wiley
    • الموضوع:
      2014
    • Collection:
      Imperial College London: Spiral
    • نبذة مختصرة :
      Iso-selective initiators for the ring-opening polymerization (ROP) of rac-lactide are rare outside of Group 13. We describe the first examples of highly iso-selective lutetium initiators. The phosphasalen lutetium ethoxide complex shows excellent iso-selectivity, with a Pi value of 0.81–0.84 at 298 K, excellent rates, and high degrees of polymerization control. Conversely, the corresponding La derivative exhibits moderate heteroselectivity (Ps=0.74, 298 K). Thus, the choice of metal center is shown to be crucial in determining the level and mode of stereocontrol. The relative order of rates for the series of complexes is inversely related to metallic covalent radius: that is, La>Y>Lu.
    • ISSN:
      1521-3773
    • Relation:
      Angewandte Chemie-International Edition; http://hdl.handle.net/10044/1/40656; http://dx.doi.org/10.1002/anie.201403643; EP/C544846/1; EP/K035274/1; n/a
    • الرقم المعرف:
      10.1002/anie.201403643
    • الدخول الالكتروني :
      http://hdl.handle.net/10044/1/40656
      https://doi.org/10.1002/anie.201403643
    • Rights:
      © 2014 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
    • الرقم المعرف:
      edsbas.7C89CD74