Organic and Biomolecular Chemistry p. 2982 - 2987 (2008)
Update date:2022-08-11
Topics:
Kishimoto, Takao
Uraki, Yasumitsu
Ubukata, Makoto
We describe the synthesis and NMR spectroscopic analysis of three artificial lignin polymers containing only the β-O-4 substructure: syringyl-type homopolymer, p-hydroxyphenyl-type homopolymer and guaiacyl/syringyl-type heteropolymer. Using gel permeation chromatography, the weight-average degree of polymerization (DPw) of the three polymers was determined as 19.2, 38.6, and 13.9, respectively. The polymers were prepared based on the synthetic methodology of guaiacyl-type homopolymer, and were fully characterized using 1H-, 13C-, and 1H- 13C NMR spectroscopy of the acetylated and non-acetylated forms. The spectra of guaiacyl/syringyl-type heteropolymers were in good agreement with those of the β-O-4 substructure of milled wood lignin obtained from the hardwood of Japanese white birch. The Royal Society of Chemistry.
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