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

Authors:
Publisher website
Google Scholar
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.
Funding Information
  • Israel Science Foundation (650/14)
  • Israel Science Foundation (2711/17)

This publication has 39 references indexed in Scilit: