Synthesis and characterization of dinuclear aluminum complexes bearing N,N-Dialkylaniline-amido ligands and its catalytic properties for lactone polymerization

Abstract

Two ligands [ortho-C₆H₄NR₂(CH₂NH)]₂CH₂CH₂(3: R=Me; 4: R=Et) were prepared by the reduction of preligands [ortho-C₆H₄NR₂(CH=N)]₂CH₂CH₂(1: R=Me; 2: R=Et). These ligands reacted with AlMe₃ to afford the corresponding dinuclear aluminum complexes {AlMe₂[ortho-C₆H₄NR₂(CH₂N)]}₂CH₂CH₂(5: R=Me; 6: R=Et). All the compounds were characterized by ¹H and ¹³C nuclear magnetic resonance(NMR) spectroscopies and elemental analyses. The catalytic properties of the aluminum complexes towards the ring-opening polymerization of lactones were investigated in the presence of benzyl alcohol. All the polymerization reactions were proceeded in a controlled manner.

Keywords

Dinuclear aluminum / Ring-opening polymerization / Lactone

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