Abstract
Lignin propionates were prepared by treating lignin samples with propionic anhydride in pyridine solution and the derivatives obtained were examined by NMR spectroscopic methods. 1H NMR spectroscopy of lignin propionates offers a possibility to determine the number of hydroxyl groups based on the methyl proton signal (δ ∼ 1.2) as well as the methylene proton signal (δ ∼ 2.5) of the propionate groups. It was found to be advantageous to use propionate derivatives for the analysis of hydroxyl groups in lignin products exhibiting signals (from >CH- and -CH2- groups) that interfere with the acetate group signals. Analysis of ester groups by 13C NMR spectroscopy gave practically the same results as those earlier reported for acetate derivatives.
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