Rotaxane-catalyzed aerobic oxidation of primary alcohols

IF 5.9 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Communications Chemistry Pub Date : 2024-11-27 DOI:10.1038/s42004-024-01375-0
Ilario Baù, Cecilia Poderi, Francesca Sardu, Alessia Giancola, Anna Turchetti, Paola Franchi, Lorenzo Casimiro, Leonardo Andreoni, Serena Silvi, Elisabetta Mezzina, Marco Lucarini
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Abstract

Nitroxide radicals are widely utilized as catalysts for the oxidation of primary alcohols. Here, the aerobic catalytic oxidation cycle of nitroxide radicals has been implemented within a mechanically interlocked rotaxane architecture consisting of a paramagnetic crown ether, which is confined by a molecular axle containing a dialkylammonium station and a 1,2,3-triazole unit. The rotaxane is engineered to exploit the oxidation of a primary alcohol: the primary catalyst is the wheel, a nitroxide radical capable of altering its oxidation state during the catalytic cycle, while the co-oxidant is the Cerium(IV)/O2 couple. The synthesis of the proposed rotaxane, along with its characterization using EPR, HRMS, voltammetry and NMR data, is reported in the paper. The aerobic catalytic oxidation cycle was further investigated using EPR, NMR and GC-MS analyses. This study can aid in the design of autonomously driven molecular machines that exploit the aerobic catalytic oxidation of nitroxide radicals. Catalytic cycles have been demonstrated in mechanically interlocked systems. Here, the authors report a [2]rotaxane containing a nitroxidic radical macrocycle and establish the efficiency of its catalytic redox cycle in this constrained environment.

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Rotaxane 催化的伯醇有氧氧化。
亚硝基被广泛用作伯醇氧化的催化剂。在这里,亚硝基自由基的有氧催化氧化循环是在一种机械互锁的轮烷结构中实现的,该结构由顺磁冠醚组成,并被含有二烷基铵站和 1,2,3- 三唑单元的分子轴所限制。轮烷的设计目的是利用伯醇的氧化作用:主要催化剂是轮,这是一种能在催化循环过程中改变其氧化状态的亚硝基自由基,而助氧化剂则是铈(IV)/O2 对偶。论文报告了拟议的轮烷的合成过程,以及利用 EPR、HRMS、伏安法和 NMR 数据对其进行的表征。利用 EPR、NMR 和 GC-MS 分析进一步研究了有氧催化氧化循环。这项研究有助于设计利用亚硝基有氧催化氧化的自主驱动分子机器。
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来源期刊
Communications Chemistry
Communications Chemistry Chemistry-General Chemistry
CiteScore
7.70
自引率
1.70%
发文量
146
审稿时长
13 weeks
期刊介绍: Communications Chemistry is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the chemical sciences. Research papers published by the journal represent significant advances bringing new chemical insight to a specialized area of research. We also aim to provide a community forum for issues of importance to all chemists, regardless of sub-discipline.
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