期刊
GREEN CHEMISTRY
卷 16, 期 7, 页码 3635-3642出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4gc00709c
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资金
- Center for Direct Catalytic Conversion of Biomass to Biofuels (C3Bio)
- Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0000997]
New Co-Schiff base complexes that incorporate a sterically hindered ligand and an intramolecular bulky piperazine base in close proximity to the Co center are synthesized. Their utility as catalysts for the oxidation of para-substituted lignin model phenols with molecular oxygen is examined. Syringyl and guaiacyl alcohol, as models of S and G units in lignin, are oxidized in good yield using a catalyst bearing an N-benzylpiperazinyl substituent, with the catalysts displaying improved reactivity for G oxidation. Computational evaluation of the catalysts shows that the piperazinyl substituent is within bonding distance of the Co center. The increased steric interference is suggested as the source of increased G reactivity.
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