Both the use of renewable natural sources to prepare catalytic materials and the Meerwein–Ponndorf–Verley (MPV) reduction for carbonyl compounds are very attractive topics in catalysis. In this study, tannins were simply assembled with zirconium in water for the scalable preparation of a heterogeneous zirconium–tannin hybrid catalyst (Zr-tannin). Various characterizations demonstrated the formation of robust porous inorganic–organic frameworks and strong Lewis acid–base sites in Zr-tannin. The cooperative effect of these acid–base sites and the abundant porosity endowed Zr-tannin with a remarkable catalytic performance for the MPV reduction of a broad range of carbonyl compounds to alcohols with 2-propanol under mild conditions. Moreover, Zr-tannin exhibited good recyclability for at least five reaction cycles. This novel strategy using tannins as the raw materials to construct heterogeneous catalytic materials may have a huge potential for green chemical synthesis due to low cost, nontoxicity, and sustainability.

中文翻译：

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丹宁酸衍生的含锆多孔杂化物，在温和条件下能有效降低Meerwein–Ponndorf–Verley

使用可再生自然资源制备催化材料以及Meerwein-Ponndorf-Verley（MPV）还原羰基化合物都是催化领域中非常有吸引力的主题。在这项研究中，单宁简单地与水中的锆组装在一起，以可扩展规模制备锆-单宁杂化催化剂（Zr-单宁）。各种特征表明，在Zr单宁中形成了坚固的多孔无机有机骨架和坚固的Lewis酸碱位。这些酸碱位点和大量孔隙的协同作用赋予Zr-单宁以显着的催化性能，在温和条件下用2-丙醇将多种羰基化合物MPV还原为醇。而且，Zr-单宁在至少五个反应循环中表现出良好的可回收性。