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Summary Paris-Grignon, Lignin polymer model Dehydrogenation polymer The structures of novel lignin polymer models prepared from coniferin or coniferyl alcohol under conditions that approximate cell wal1 Signification were characterized by thioacidolysi s. The linkage- of monolignol (DHP) type analysis by thioacidolysi s indicates that the structure of these polylignols approximated that of -. Monolignol glucoside native lignin more closely than did the structure of polylignols prepared by the conventional method Coniferyl ulcohol from coniferyl alcohol. Among v:arious possible factors affecting the structure of polylignols during Thioacidolysis polymerization under the present experimental conditions, the important ones appears to be: pH of the medium in which dehydrogenativc polymerization of coniferyl alcohol takes place; relative concentra- tions of monomer and oligomer radicals; and the carbohydrate matrix in which polymerization occurs.

holzforschung

New Preparations of Lignin Polymer Models under Conditions that Approximate Cell Wall Lignification. II. Structural Characterization of the Models by Thioacidolysis