金属有机骨架中TEMPO自由基的衍生化固定化方法:迈向高效的有氧氧化和顺序反应

IF 2.2 4区 化学
Seungheon Cha, Daeyeon Lee, Jiwon Kang, Jonghyeon Lee, Seongwoo Kim, Houng Kang, Soyoung Park, Min Kim
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引用次数: 0

摘要

金属有机框架(mof)为固定化具有催化活性的物质提供了一个通用的平台,通过其结构的可调节性和良好定义的孔隙环境,实现了多种有机转化。本研究研究了zr基mof中(2,2,6,6-四甲基胡椒苷-1-酰基)氧基(TEMPO)自由基的共价固定化,合成了六种具有不同键的不同框架,包括酰胺、酯、醚、三唑和脲。这些mof在仲醇有氧氧化制酮的催化效率进行了评估,强调了电子效应、连接剂大小和TEMPO自由基密度的作用。此外,这些系统通过环加成实现了异恶唑合成的顺序催化过程,高效地生成了16种异恶唑。虽然zr基mof在初始氧化步骤中表现出良好的性能,但在环加成步骤中,由于tbn过量,其结晶度下降。MOF结构上的Ce取代部分减轻了这种结构降解,显示了增强可回收性的潜力。这些发现为设计具有更好的氧化转化催化通用性和稳定性的tempo固定化mof提供了全面的框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Derivatizing immobilization methods for TEMPO radicals in metal–organic frameworks: Toward efficient aerobic oxidation and sequential reactions

Derivatizing immobilization methods for TEMPO radicals in metal–organic frameworks: Toward efficient aerobic oxidation and sequential reactions

Metal–organic frameworks (MOFs) offer a versatile platform for immobilizing catalytically active species, enabling diverse organic transformations through their structural tunability and well-defined pore environments. This study investigates the covalent immobilization of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) radicals in Zr-based MOFs, synthesizing six distinct frameworks with varying linkages, including amides, esters, ethers, triazoles, and ureas. The catalytic efficiency of these MOFs was evaluated in the aerobic oxidation of secondary alcohols to ketones, highlighting the role of electronic effects, linker size, and TEMPO radical density. Furthermore, these systems enabled a sequential catalytic process for isoxazole synthesis via cycloaddition, yielding 16 isoxazoles with high efficiency. While Zr-based MOFs exhibited robust performance in the initial oxidation step, their crystallinity degraded under TBN-excess conditions during the cycloaddition step. Ce substitution on MOF structure partially mitigated this structural degradation, demonstrating potential for enhanced recyclability. These findings offer a comprehensive framework for designing TEMPO-immobilized MOFs with improved catalytic versatility and stability in oxidative transformations.

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来源期刊
Bulletin of the Korean Chemical Society
Bulletin of the Korean Chemical Society Chemistry-General Chemistry
自引率
23.50%
发文量
182
期刊介绍: The Bulletin of the Korean Chemical Society is an official research journal of the Korean Chemical Society. It was founded in 1980 and reaches out to the chemical community worldwide. It is strictly peer-reviewed and welcomes Accounts, Communications, Articles, and Notes written in English. The scope of the journal covers all major areas of chemistry: analytical chemistry, electrochemistry, industrial chemistry, inorganic chemistry, life-science chemistry, macromolecular chemistry, organic synthesis, non-synthetic organic chemistry, physical chemistry, and materials chemistry.
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