title: Dinucleating Ligand Platforms Supporting Indium and Zinc Catalysts for Cyclic Ester Polymerization.
abstract: The synthesis of the first alkoxide-bridged indium complex supported by a chiral dinucleating ligand platform (1), along with its zinc analogue (2), is reported. Both complexes are synthesized in a one-pot reaction starting from a chiral dinucleating bis(diamino)phenolate ligand platform, sodium ethoxide, and respective metal salts. The dinucleating indium analogue (7) based on an achiral ligand backbone is also reported. Indium complexes bearing either the chiral or achiral ligand catalyze the ring-opening polymerization of racemic lactide (rac-LA) to afford highly heterotactic poly(lactic acid) (PLA; Pr > 0.85). The indium complex bearing an achiral ligand affords essentially atactic PLA from meso-LA. The role of the dinucleating ligand structure in catalyst synthesis and polymerization activity is discussed.
authors.affiliation: Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Alexandre B
authors.initials: AB
authors.lastname: Kremer
authors.affiliation: Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Kimberly M
authors.initials: KM
authors.lastname: Osten
authors.affiliation: Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Insun
authors.initials: I
authors.lastname: Yu
authors.affiliation: Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Tannaz
authors.initials: T
authors.lastname: Ebrahimi
authors.affiliation: Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Dinesh C
authors.initials: DC
authors.lastname: Aluthge
authors.affiliation: Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Parisa
authors.initials: P
authors.lastname: Mehrkhodavandi