4.7 Article

NMR Assignment for Diaryl Ether Structures (4-O5 Structures) in Pine Wood Lignin

Journal

BIOMACROMOLECULES
Volume 17, Issue 6, Pages 1921-1929

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.biomac.6b00257

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Funding

  1. PRESTO program from Japan Science and Technology Agency (JST)
  2. Project for Creation of Research Platforms and Sharing of Advanced Research Infrastructure by the Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT)
  3. Grants-in-Aid for Scientific Research [15K14767] Funding Source: KAKEN

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A 4-O-5-tetramer lignin model compound carrying beta-O-4 linkages on each Of the side-chain Moieties was synthesized, as well as 4-O-5-coupled dehydrodiconiferyl alcohol. By comparison with theiriNMR,data, two cross signals in the HSQC spectrum Of pane milled wood lignin recorded in DMSO-d(6) were assigned-to H2/C2 and H6/C6 correlations on the aromatic rings of 4-O-5-linke.d units; Although the H2/C2 correlation peak- appeared in the same region as syringyl units, nitrobenzene-oxidation of the pine lignin did not yield any syringyl-type product, but did release a 4-O-5-type product.

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