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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

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

Liu Shaofeng S   Zhang Jie J   Zuo Weiwei W   Zhang Wenjuan W   Sun Wen-Hua WH   Ye Hongqi H   Li Zhibo Z  

Polymers 20170301 3

The stoichiometric reactions of 8-(2,6-R¹-4-R²-anilide)-5,6,7-trihydroquinoline (<b>LH</b>) with AlR₃ (R = Me or Et) afforded the aluminum complexes <b>LAlR₂</b> (<b>Al1</b>⁻<b>Al5</b>,<b>Al1</b>: R¹ = <i><sup>i</sup></i>Pr, R² = H, R = Me; <b>Al2</b>: R¹ = Me, R² = H, R = Me; <b>Al3</b>: R¹ = H, R² = H, R = Me; <b>Al4</b>: R¹ = Me, R² = Me, R = Me; <b>Al5</b>: R¹ = Me, R² = Me, R = Et) in high yields. All aluminum complexes were characterized by NMR spectroscopy and elemental analysis. The mole  ...[more]

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