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Evaluating Gold and Selenium Chemistry for Selective Transformations of Lignin Model Compounds
Advanced Synthesis & Catalysis ( IF 4.4 ) Pub Date : 2018-02-08 , DOI: 10.1002/adsc.201701207
Wagner C. C. Santos 1 , Kevin A. Dias 1 , Leidaiany P. Santos 1 , Camila M. Kisukuri 1 , Thenner S. Rodrigues 1 , Rafael S. Geonmonond 1 , Pedro H. C. Camargo 1 , Leandro H. Andrade 1
Affiliation  

Applications of gold and selenium chemistry are reported as novel approaches to promote lignin depolymerization into more valuable chemicals via selective oxidation reactions (alcohol oxidations and Baeyer‐Villiger reactions). In this study, we proposed two different oxidative methodologies using Au/SiO2 and phenylseleninic acid resin (PAR) as stable and reusable catalysts to promote selective transformations of the β‐O‐4 linkage of lignin model compounds. After evaluating the catalytic systems under batch conditions, they were both applied in a packed‐bed reactor for continuous flow operations. By using Au/SiO2 as a catalyst under flow conditions, ketones were efficiently obtained (up to 86% conversion) from the oxidation of alcohols with a residence time (tR) of 30 min. In the case of Baeyer‐Villiger oxidations catalyzed by phenylseleninic acid resin, the corresponding esters were obtained in up to 91% conversion (tR=30 min). Both systems efficiently catalyzed the conversion of the lignin model compounds.

中文翻译:

评估金和硒化学法对木质素模型化合物的选择性转化

据报道,金和硒化学的应用是通过选择性氧化反应(酒精氧化和拜耳-维利格反应)促进木质素解聚为更有价值的化学物质的新方法。在这项研究中,我们提出了两种不同的氧化方法,分别使用Au / SiO 2和苯硒酸树脂(PAR)作为稳定和可重复使用的催化剂,以促进木质素模型化合物的β-O-4键的选择性转化。在分批条件下评估催化体系后,它们都被应用于填充床反应器中以进行连续流动操作。通过在流动条件下使用Au / SiO 2作为催化剂,可以通过停留时间(t R)的醇氧化有效地获得酮(转化率高达86%)。)的30分钟。在苯硒酸树脂催化的Baeyer-Villiger氧化的情况下,以高达91%的转化率获得相应的酯(t R = 30分钟)。两种系统均有效地催化木质素模型化合物的转化。
更新日期:2018-02-08
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