Abstract
Acid-base bifunctional organic polymeric catalysts were synthesized with tunable structures. we demonstrated two synthesis approaches for structural fine-tune. In the first case, the framework flexibility was tuned by changing the ratio of rigid blocks to flexible blocks within the polymer framework. In the second case, we precisely adjusted the acid-base distance by distributing basic monomers to be adjacent to acidic monomers, and by changing the chain length of acidic monomers. In a standard test reaction for the aldol condensation of 4-nitrobenzaldehyde with acetone, the catalysts showed good reusability upon recycling and maintained relatively high conversion percentage.
Highlights
Acid-base bifunctional organic polymeric catalysts were synthesized with tunable structures. we demonstrated two synthesis approaches for structural fine-tune
Using an array of catalysts synthesized with acrylic acid and acrylyl-amino acids as acidic monomers with different chain length, we investigated the effects of the distance between the acidic and basic sites on the catalytic performance of the aldol condensation of 4-nitrobenzaldehyde and acetone
In summary, acid-base bifunctional organic polymeric catalysts with tunable structure were successfully synthesized for the first time
Summary
Acid-base bifunctional organic polymeric catalysts were synthesized with tunable structures. we demonstrated two synthesis approaches for structural fine-tune. The substrate causes a conformational change in the enzyme it associates with, such that the active sites achieve the exact configuration required for a particular reaction to occur[16] To effectively mimic this aspect of enzyme function, the preparation of bifunctional catalysts with precisely controlled framework flexibility and finely tuned distances between different functionalities is necessary. Neither precise adjustment of the distance between a given acid and amino group nor successful tuning of a flexible catalyst framework supported on mesoporous silica has been reported in the literature. Using an array of catalysts synthesized with acrylic acid and acrylyl-amino acids as acidic monomers with different chain length, we investigated the effects of the distance between the acidic and basic sites on the catalytic performance of the aldol condensation of 4-nitrobenzaldehyde and acetone
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