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Synthesis and spectroscopic characterization of p-hydroxyphenyl, guaiacyl and syringyl lignin polymer models (DHPs)

Dehydrogenation polymers (DHPs) were prepared under identical conditions from p-coumaryl, coniferyl and sinapyl alcohols in the "Zutropfverfahren" mode using horseradish peroxidase to catalyze the polymerization. After fractionation by gel permeation chromatography, the DHPs were characterized by diffuse-reflectance FT-IR spectroscopy, as well as by solution and solid-state I3C NMR spectroscopy. This is the first report containing both solution and solid-state NMR spectra for all three homogeneous DHPs with pure H, G and S structure.