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E. Ämmälahti, G. Brunow

Use of ?-13 C labelled Coniferyl Alcohol to Detect "End-Wise" Polymerization in the Formation of DHPs

The possibility that preformed dehydrogenation polymer (DHP) could function as a template to induce a structural pattern in DHP more closely resembling that of natural softwood lignin was investigated by oxidizing ?-¹³C-labelled coniferyl alcohol in a medium containing preformed unlabelled polymeric DHP. The experiments were performed at pH 4 and pH 6.5. 1D and 2D NMR were used to estimate the distribution of structural units. No such template effect was found in a comparison of unlabelled with uniformly labelled DHP. Indeed, the effect of pH on the coupling pattern of coniferyl alcohol was greater than the effect of the preformed DHP.

Holzforschung, Walter de Gruyter

Print ISSN: 0018-3830
Volume: 54, 10/2000
Pages: 604 - 608

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