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Dithiodiolate ligands: group 4 complexes and application in lactide polymerization.

Ekaterina Sergeeva1, Jacob Kopilov, Israel Goldberg

  • 1School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel.

Inorganic Chemistry
|April 2, 2010
PubMed
Summary

New dithiodiolate ligands were synthesized and formed group 4 metal complexes. These complexes showed high activity in the ring-opening polymerization of lactide, indicating potential applications in polymer synthesis.

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Area of Science:

  • Organometallic Chemistry
  • Polymer Science

Background:

  • Dithiodiolate ligands are versatile building blocks in coordination chemistry.
  • Group 4 metal complexes are known catalysts for various organic transformations.

Purpose of the Study:

  • To synthesize novel dithiodiolate ligands and their corresponding group 4 metal complexes.
  • To investigate the catalytic activity of these complexes in the ring-opening polymerization of lactide.

Main Methods:

  • Synthesis of dithiodiolate ligands via reaction of dithiols with 2,2-bis(trifluoromethyl)oxirane.
  • Formation of mononuclear octahedral group 4 complexes.
  • Evaluation of catalytic performance in lactide polymerization.

Main Results:

  • Selective synthesis of [{OSSO}M(OR)(2)] type complexes with C(2) symmetry.
  • Complexes exhibited fluxional behavior.
  • High catalytic activity in the ring-opening polymerization of rac- and L-lactide.

Conclusions:

  • The synthesized dithiodiolate-based group 4 complexes are effective catalysts for lactide polymerization.
  • The structural features, including C(2) symmetry and fluxionality, may influence catalytic activity.