Sadjadi Samahe, Abedian-Dehaghani Neda, Heravi Majid M
Gas Conversion Department, Faculty of Petrochemicals, Iran Polymer and Petrochemical Institute, PO Box 14975-112, Tehran, Iran.
Department of Chemistry, School of Physics and Chemistry, Alzahra University, Vanak, PO Box 1993891176, Tehran, Iran.
Sci Rep. 2022 Sep 3;12(1):15040. doi: 10.1038/s41598-022-19288-0.
Cyclotriphosphazen-hexa imine ligand was prepared through successive reactions of phosphonitrilchloride trimer with 4-hydroxybenzaldehyde and (3-aminopropyl) triethoxy silane. The as-prepared ligand was then covalently grafted on boehmite to furnish an efficient support for the immobilization of Pd nanoparticles and synthesis of a novel heterogeneous catalyst for hydrogenation of nitro arenes. The catalytic tests revealed that the catalyst had excellent catalytic activity for hydrogenation of various nitro arenes with different steric and electronic features under mild reaction condition in aqueous media. Noteworthy, the catalyst was highly selective and in the substrates with ketone or aldehyde functionalities, reduction of nitro group was only observed. The catalyst was also recyclable and only slight loss of activity was detected after each recycling run. Hot filtration test also approved true heterogeneous nature of catalysis.
通过三聚磷腈氯化物与4-羟基苯甲醛和(3-氨丙基)三乙氧基硅烷的连续反应制备了环三磷腈-六亚胺配体。然后将所制备的配体共价接枝到勃姆石上，为钯纳米颗粒的固定化和用于硝基芳烃氢化的新型多相催化剂的合成提供了一种有效的载体。催化测试表明，该催化剂在水介质中的温和反应条件下，对具有不同空间和电子特性的各种硝基芳烃的氢化反应具有优异的催化活性。值得注意的是，该催化剂具有高度选择性，在具有酮或醛官能团的底物中，仅观察到硝基的还原。该催化剂还可循环使用，每次循环后仅检测到轻微的活性损失。热过滤测试也证实了催化反应的真正多相性质。
