Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 5, Pages 5990-5998Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b04597
Keywords
Lignin oxidation; HSQC; Lignin depolymerization; Vanillic acid
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Funding
- National Science Foundation [1355438]
- DOE Great Lakes Bioenergy Research Center (DOE Office of Science) [BER DE-FC02-07ER64494]
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Mechanochemical treatment of Indulin AT haft lignin by ball-milling with KOH and toluene produces significant carbonyl functionality, among other changes. The chemical reactivity of the lignin is increased, resulting in greater lignin degradation from porphyrin oxidation followed by Baeyer-Villiger oxidation. The mechanochemical treatment produces a level of lignin oxidation that is similar to that produced by porphyrin-catalyzed oxidation. Combining mechanochemical treatment with porphyrin oxidation has a synergistic positive effect on the depolymerization of lignin, as demonstrated by a significantly higher yield of monomers. The methyl ester of vanillic acid was obtained as the main monomeric product (after methylation), along with of methyl 5-carbomethoxyvanillate, in a 10% yield, which is among the highest reported from haft lignin.
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