Reactions of Lignin during Sulfate Pulping. Part XIX. Isolation and Identification of New Dimers from a Spent Sulfate Liquor.

Publisher Website
Google Scholar
Abstract
The lipophilic portion of a neutralized spent liquor from sulfate cooking of spruce (Picea abies) wood meal was fractionated by conventional and high pressure liquid chromatographic techniques. In addition to previously reported degradation products (mainly monomeric compounds), a series of new dimers was isolated and identified using 1H and 13C NMR and mass spectroscopic methods. The formation of these dimers from prominent structures in softwood lignins is discussed in terms of degradation reactions elucidated in previous model experiments.