Aluminum Complexes of Octahydrophenanthroline-Based Salophan Ligands: Coordination Chemistry and Activity in the Ring-Opening Polymerization of Lactide

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Abstract

Salophan ligands featuring the octahydrophenanthroline core are described for the first time. Two ligand precursors featuring either di-tert-butylphenolate or dichlorophenolate were prepared by 1,10-phenanthroline hydrogenation followed by reaction with bromomethyl-substituted phenols. The ligand precursors react with AlMe3 to give the [{ONNO}Al-Me]-type complexes as single stereoisomers of averaged Cs-symmetry on the NMR timescale. The reactivity of the methylaluminum complexes depends strongly on the phenolate substituents: The complex of the bulky ligand is inert towards alcohols and inactive in the ring-opening polymerization of rac-LA, whereas the complex of the non-bulky ligand reacts readily with benzyl alcohol to yield the corresponding [{ONNO}Al-OBn] complex, which polymerizes rac-LA to give isotactically inclined PLA.

Original languageEnglish
Pages (from-to)5047-5052
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Volume2018
Issue number47
DOIs
StatePublished - 19 Dec 2018

Keywords

  • Aluminum
  • Ligand effects
  • N ligands
  • Poly(lactic acid)
  • Polymerization

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