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首页> 外文期刊>Journal of the Brazilian Chemical Society >Multifunctional Imidazole-Derived Polymeric Catalyst for Dephosphorylation Reactions Potentiated by Cationic and Anionic Micelles
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Multifunctional Imidazole-Derived Polymeric Catalyst for Dephosphorylation Reactions Potentiated by Cationic and Anionic Micelles

机译：多功能咪唑衍生的聚合催化剂，用于阳离子和阴离子胶束的去磷酸化反应

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>Results confirm the catalytic potential of imidazole groups anchored on the polymeric backbone of polyvinylimidazole (PVI) in dephosphorylation reactions with di- and tri-phosphoesters, promoting impressive enhancements up to 107-fold. We propose the imidazole groups on PVI react by nucleophilic catalysis (neutral specie) with a phosphate triester and bifunctionally by general acid-nucleophilic catalysis (bipolar species) with a diester. Additionally, PVI can incorporate the reactants on its domains by hydrophobic and electrostatic attraction, confirming the polymer multifunctionality. Moreover, a pronounced micellar catalysis was observed for the reactions which, surprisingly, occurs with both cationic and anionic micelles, due to favorable approximation effects. The micellar effects observed confirms the reactivity of the bipolar species. Based on the pseudophase model, the reagents can be incorporated in the micellar phase, mainly by hydrophobic forces. Overall, we confirm that PVI has great potential as an artificial enzyme, since it undergoes enzymatic-like mechanisms with an elegant bifunctional catalysis.
机译：>结果证实了锚固在聚乙烯基咪唑（PVI）聚合物主链上的咪唑基在与二和三磷酸酯的去磷酸化反应中的催化潜能，促进了多达107倍的显着增强。我们提出PVI上的咪唑基团通过亲和催化（中性物质）与磷酸三酯反应，并通过一般的酸亲核催化（双极性物质）与二酯发生双功能反应。此外，PVI可以通过疏水和静电吸引将反应物结合到其结构域中，从而确认了聚合物的多功能性。此外，由于良好的近似作用，对于阳离子和阴离子胶束都发生的反应，观察到明显的胶束催化。观察到的胶束效应证实了双极性物质的反应性。基于伪相模型，可以主要通过疏水力将试剂掺入胶束相中。总体而言，我们确认PVI作为人造酶具有巨大潜力，因为它会经历类似酶的机制并具有优雅的双功能催化作用。

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