Abstract
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 = 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 ε-caprolactone (ε-CL) and rac-lactide (rac-LA), respectively, in a living/controlled manner.
Highlights
IntroductionA convenient method for the synthesis of polyesters is the ring-opening polymerization (ROP) of cyclic esters using metal complexes as catalysts or initiators, including aluminum [5,6,7,8,9], rare earth metals [10,11,12,13], titanium and zirconium [14,15], magnesium and zinc [16,17,18,19,20,21,22], tin [23,24], and iron [25,26,27,28] complexes
The ancillary ligands in important role in determining the catalytic performances by tuning the electronic and steric the aluminum-based catalytic systems have been proved to be an important role in determining the properties
Al4 and Al5 were analyzed by X-ray diffractions and revealed distorted tetrahedral geometries around
Summary
A convenient method for the synthesis of polyesters is the ring-opening polymerization (ROP) of cyclic esters using metal complexes as catalysts or initiators, including aluminum [5,6,7,8,9], rare earth metals [10,11,12,13], titanium and zirconium [14,15], magnesium and zinc [16,17,18,19,20,21,22], tin [23,24], and iron [25,26,27,28] complexes. Aluminum complexes bearing ancillary ligands have attract the most of attention and are one kind of the most promising catalysts for ROP of cyclic. The ancillary ligands in important role in determining the catalytic performances by tuning the electronic and steric the aluminum-based catalytic systems have been proved to be an important role in determining the properties
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