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Co(salen)/SBA-15 catalysed oxidation of a β-O-4 phenolic dimer under microwave irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
50384 46793 2011 3 PDF Available
Title
Co(salen)/SBA-15 catalysed oxidation of a β-O-4 phenolic dimer under microwave irradiation
Abstract

The microwave-assisted oxidative degradation of a lignin model phenolic dimer [1-(4-hydroxy-3-methoxyphenoxy)-2-(2-methoxyphenoxy)-propane-1,3-diol, 1] catalysed by Co(salen)/SBA-15 is reported. The investigated model compound 1 was prepared through a multistep synthesis and characterized by 1H,13C NMR, and GC–MS studies. The catalyst was prepared by immobilizing [N,N′-bis(salicylidene)ethane-1,2-diaminato]Cobalt(II), Co(salen) complex onto the periodic mesopore channels of siliceous SBA-15. The activity of the Co(salen)/SBA-15 was investigated in the oxidation of 1 in the presence of hydrogen peroxide as oxidant, both under microwave irradiation and conventional heating. The phenolic dimer was selectively oxidized to 2-methoxy phenol with very high TON under microwave activation conditions. Comparatively, reactions run under conventional heating led to oligomerisation of the dimer and resulted in a mixture of products.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights►The use of a Co(salen)/SBA-15 in the oxidation of a ligning model phenolic dimer. ►A microwave-assisted highly selective oxidative degradation protocol. ►Conventional heating reactions leading to oligomerisation of the dimer into a mixture of products.

Keywords
Lignin oxidation; β-O-4 phenolic dimer; Microwave; Co(salen)/SBA
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Co(salen)/SBA-15 catalysed oxidation of a β-O-4 phenolic dimer under microwave irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 11, 10 June 2011, Pages 993–995
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us