The Influence of Solvent and Derivatization on the 1H NMR Spectral Properties of Lignin Model Compounds

Paper in proceeding, 2008

1H NMR spectral data for lignin model compounds are of interest in connection with the interpretation of NMR spectra of lignins recorded by 1D (1H NMR) and certain 2D spectroscopic techniques. Derivatization influences the peak positions in the 1H NMR spectra of lignin models to a large extent. Similarly an exchange of solvent often results in dramatic shifts of peak positions. Solvent and derivatization effects can be employed for the interpretation of lignin spectra in structural terms. This is here exemplified by results from analyses of lignin samples with respect to total hydroxyl, phenolic groups, distribution of diastereomers of arylglycerol β-aryl ethers, different types of β-β structures and occurrence of 1-aryl-2-aryloxy-1-propanone structures.