Identification of the Major Thioacidolysis Products

The gas chromatograms and mass spectral data which provide the basis for the identification of thioacidolysis products from extractive-free poplar and the 

C6C2 monomeric compounds, corresponding to peaks 7 and 9, originate from a minor reaction pathway via elimination of the y-hydroxymethyl group similar to the minor degradation pathway identified in acidolysis (Lundquist 

GC Peaka Product (TMS derivative) Molecular ion and prominent fragments m/z (rel. intensity) 

With milled wood lignins or arylglycerol-/ -aryl ether dimers, the contribution of such C6C2 compounds amounts to less than 10% of that of the major CftC-i compounds. 

Peak 3 (Fig. 6.4.3) corresponds to p-hydroxybenzoic acid which is mainly ester-linked in poplar lignins. Although no study using appropriate model compounds has been made, it may be assumed that the thioacidolysis reagent is able to cleave, to a minor extent, benzoic and p-hydroxycinnamic ester linkages, as manifested by the recovery of benzoic and p-hydroxycinnamic acids from 

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