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The stoichiometric reactions of 8-(2,6-R¹-4-R²-anilide)-5,6,7-trihydroquinoline ( LH ) with AlR₃ (R = Me or Et) afforded the aluminum complexes LAlR₂ ( Al1 ⁻ Al5 , Al1 : R¹ =  i  Pr, 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 ε -caprolactone ( ε -CL) and rac -lactide ( rac -LA), respectively, in a living/controlled manner.

polymers

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