Enhanced lewis acid-base pair catalytic system and use thereof

By introducing cyclic anhydrides into a Lewis acid-base pair catalytic system to form quaternary onium carboxylate intermediates, the problems of low reactivity and poor controllability of existing catalytic systems are solved, achieving a copolymerization reaction of epoxides and C1 monomers with high activity and high selectivity, producing polycarbonate. The catalyst is resistant to high temperatures.

CN119978339BActive Publication Date: 2026-06-05HEBEI UNIV OF TECH
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Patent Information

Application Number
CN202510307184.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-16
Publication Date
2026-06-05
Estimated Expiration
2045-03-16

AI Technical Summary

Technical Problem

Existing Lewis acid-base pair catalytic systems suffer from low reactivity, poor controllability, and numerous byproducts in the copolymerization of epoxides and C1 monomers, especially under high temperature and high catalyst concentration conditions.

Method used

A novel enhanced Lewis acid-base pair catalytic system is formed by introducing cyclic anhydrides with Lewis bases and Lewis acids. By generating quaternary onion carboxylate intermediates in situ, the nucleophilicity and electrophilicity of the catalyst are enhanced, thereby improving the reaction activity and selectivity.

Benefits of technology

It achieves highly active and selective catalytic reactions with a conversion frequency (TOF) of up to 78,000 h⁻¹, reduces byproducts, exhibits excellent high-temperature resistance, produces mainly polycarbonate products, and has no metal residues.

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Abstract

The application discloses a Lewis acid-base pair catalytic system and application thereof. The catalytic system comprises a Lewis base, a cyclic acid anhydride and a Lewis acid; wherein the molar ratio of the Lewis base, the cyclic acid anhydride and the Lewis acid is 1:0.1-10:0.25-10. The cyclic acid anhydride, the Lewis base, an epoxide and the Lewis acid are sequentially added into a reaction kettle, and then a carbon monomer is added, and then the reaction is carried out under a closed condition at 25-150 DEG C for 0.1-36 hours to obtain an epoxy copolymer. The application can enhance the reaction activity of the Lewis acid-base pair catalytic system, selectivity and high activity under a low catalyst concentration, and the highest turnover frequency (TOF) is 78000 h ‑1 .
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Citation Information

Patent Citations

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  • Method for synthesizing aliphatic polyesters through copolymerization of cyclic anhydride and epoxy compounds catalyzed by frustrated Lewis pair

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