Abstract
Developing efficient solid acid catalysts for aqueous organic reactions is of great importance for the development of sustainable chemistry. In this work, a porous polymeric acid catalyst was synthesized via a solvothermal copolymerization and a successive ion-exchange method. Physicochemical characterizations suggested that the prepared polymers possessed large Brunauer-Emmett-Teller (BET) surface areas, a hierarchically porous structure, excellent surface amphiphilicity, and nice swelling properties. Notably, an activity test in phenylacetylene hydration indicated that the prepared solid acid exhibited high catalytic activity in water, which outperformed commercial amberlyst-15, sulfuric acid, and benzenesulfonic acid. Moreover, the prepared solid acid can be easily recovered and reused at least four times. Additionally, a variety of aromatic and aliphatic alkynes could be effectively transformed into corresponding ketones under optimal reaction conditions.
Highlights
The increasing environmental concerns about harmful solvent waste has led to a considerable interest in using water as a solvent for synthetic organic chemistry [1,2]
SO3 Na-functionalized porous ionic polymer, P(QP-SBS)-x, where x refers to the mole fraction of SBS monomer to the total monomers, was solvothermally synthesized via the copolymerization of SBS
Characterization successfully prepared in quantitative yields via the solvothermal copolymerization of QP and SBS, P(QPOTf-BSA)-x, where x refers the molestructure fraction of SBSproperties to the totalofmonomers, were successfully followed by ion-exchange with
Summary
The increasing environmental concerns about harmful solvent waste has led to a considerable interest in using water as a solvent for synthetic organic chemistry [1,2]. Brønsted acids have been widely used in many water-mediated organic syntheses, such as hydrolysis and hydration reactions [3,4,5]. Performing an organic reaction with liquid Brønsted acid suffers from inherent drawbacks, such as strong corrosivity and high-volume wastes [6,7]. Towards this end, heterogeneous switching of homogeneous Brønsted acids has been developed and attracted a lot of interest [8,9,10]. The traditional reaction system over a catalytic amount of mercury salts has been known for more than a century.
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