A dimethylene pyridine bridged aminobisphenoxide alkali metal complex, its preparation method and use

By designing a dimethylenepyridine-bridged bisaminophenoloxy alkali metal complex, the problems of low activity and insufficient stability of existing catalysts were solved, realizing highly active and controllable lactide polymerization, which is suitable for industrial applications with good biocompatibility.

CN119039215BActive Publication Date: 2026-05-15EAST CHINA UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411143775.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-20
Publication Date
2026-05-15
Estimated Expiration
2044-08-20

AI Technical Summary

Technical Problem

Existing alkali metal complex catalysts exhibit low and unstable catalytic activity in lactide polymerization, especially insufficient activity in the polymerization of racemic lactide, and the crown ether ligands are toxic and unsuitable for industrial production.

Method used

By introducing a dimethylenepyridine-bridged bisaminophenoloxy alkali metal complex, the Lewis acidity and steric hindrance of the metal center can be adjusted by changing the substituents in the ligand, and the alkali metal center can be stabilized by utilizing five chelating coordination sites, thus achieving highly active and controllable catalytic ring-opening polymerization of racemic lactide.

Benefits of technology

This provides a highly efficient lactone polymerization catalyst capable of catalyzing the polymerization of L-lactide, D-lactide, rac-lactide, and meso-lactide over a wide temperature range. It exhibits high catalytic activity and controllability, is suitable for solution and melt polymerization, and is easy to prepare and stable.

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Abstract

The application discloses a kind of dimethylene pyridine bridged double aminophenol alkali metal complex and its preparation method and application in high activity catalytic lactone ring-opening polymerization.The preparation method includes the following steps: dimethylene pyridine bridged double aminophenol ligand is reacted with metal hydride in organic medium, then is filtered, concentrated, and the target dimethylene pyridine bridged double aminophenol alkali metal complex is obtained by recrystallization step.The dimethylene pyridine bridged double aminophenol alkali metal complex of the application is a kind of high-efficiency lactone ring-opening polymerization catalyst, and can be used for the polymerization reaction of high activity catalytic lactide etc.The dimethylene pyridine bridged double aminophenol alkali metal complex of the application has very obvious advantages: raw material is easy to obtain, synthesis route is simple, has high catalytic activity, can obtain high molecular weight polyester material, meets the needs of industrial department.The structural formula is as shown below:
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