Evaluating Gold and Selenium Chemistry for Selective Transformations of Lignin Model Compounds

Author(s)

Santos, Wagner C. C. ^[1] ; Dias, Kevin A. ^[1] ; Santos, Leidaiany P. ^[1] ; Kisukuri, Camila M. ^[1] ; Rodrigues, Thenner S. ^[1] ; Geonmonond, Rafael S. ^[1] ; Camargo, Pedro H. C. ^[1] ; Andrade, Leandro H. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Chem, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: ADVANCED SYNTHESIS & CATALYSIS; v. 360, n. 7, p. 1376-1383, APR 3 2018.
• Web of Science Citations: 3

Abstract

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 -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 (t(R)) of 30min. In the case of Baeyer-Villiger oxidations catalyzed by phenylseleninic acid resin, the corresponding esters were obtained in up to 91% conversion (t(R)=30min). Both systems efficiently catalyzed the conversion of the lignin model compounds. (AU)

• FAPESP's process: 15/21366-9 - HYBRID MATERIALS CONTAINING METAL NANOPARTICLES FOR CATALYTIC APPLICATIONS
• Grantee: Pedro Henrique Cury Camargo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/22457-5 - Development of biocatalytic systems for oxidation and reduction reactions
• Grantee: Leandro Helgueira de Andrade
• Support Opportunities: Regular Research Grants