Zwitterionic bis(phenolate)amine lanthanide complexes for the ring-opening polymerisation of cyclic esters

Dalton Trans. 2008 Jan 7:(1):32-5. doi: 10.1039/b714583g.

Abstract

The reaction of Sm{N(SiMe3)2}3 with the bis(phenol)amines H2O2N(R) (H2O2N(R) = RCH2CH2N(2-HO-3,5-C6H2(t)Bu2)2; R = OMe, NMe2 or Me) gave exclusively zwitterions Sm(O2N(R))(HO2N(R)). For R = OMe or NMe2 these were efficient catalysts for the ring-opening polymerisation of epsilon-caprolactone and D,L-lactide with a tendency to form cyclic esters; in contrast, no polymerisation was observed for R = Me.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Crystallography, X-Ray
  • Cyclization
  • Esters / chemical synthesis*
  • Esters / chemistry
  • Lanthanoid Series Elements / chemistry*
  • Ligands
  • Molecular Structure
  • Organometallic Compounds* / chemical synthesis
  • Organometallic Compounds* / chemistry
  • Phenols / chemistry*

Substances

  • Esters
  • Lanthanoid Series Elements
  • Ligands
  • Organometallic Compounds
  • Phenols