Synthesis of Aluminum Complexes Bearing 8-Anilide-5,6,7-trihydroquinoline Ligands: Highly Active Catalyst Precursors for Ring-Opening Polymerization of Cyclic Esters.

ABSTRACT: The stoichiometric reactions of 8-(2,6-R¹-4-R²-anilide)-5,6,7-trihydroquinoline (LH) with AlR? (R = Me or Et) afforded the aluminum complexes LAlR? (Al1?Al5,Al1: R¹ = ⁱPr, R² = H, R = Me; Al2: R¹ = Me, R² = H, R = Me; Al3: R¹ = H, R² = H, R = Me; Al4: R¹ = Me, R² = Me, R = Me; Al5: R¹ = Me, R² = Me, R = Et) in high yields. All aluminum complexes were characterized by NMR spectroscopy and elemental analysis. The molecular structures of complexes Al4 and Al5 were determined by single-crystal X-ray diffractions and revealed a distorted tetrahedral geometry at aluminum. In the presence of BnOH, complexes Al1?Al5 efficiently initiated the ring-opening homopolymerization of ?-caprolactone (?-CL) and rac-lactide (rac-LA), respectively, in a living/controlled manner.

SUBMITTER: Liu S 

PROVIDER: S-EPMC6432074 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature