BOKU - Universität für Bodenkultur Wien - Forschungsinformationssystem
Gewählte Publikation:
A. Potthast, S. Schiehser, T. Rosenau, M. Kostic.
(2009):
Oxidative modifications of cellulose in the periodate system - Reduction and beta-elimination reactions
HOLZFORSCHUNG, 63 (1), 12-17; ISSN 0018-3830
FullText
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- Abstract:
- The conversion of cellulose to dialdehyde cellulose (DAC) by treatment with aqueous periodate was studied by the CCOA method, which is a combination of gel permeation chromatography and carbonyl-selective fluorescence labeling. The beta-alkoxy-elimination reaction under alkaline conditions was used as a diagnostic tool to address the regioselectivity of the oxidation at low degrees of conversion. The oxidation proceeded by random oxidant attack; cluster-like or isolated oxidation patterns were excluded. The beta-alkoxy-elimination proceeded as a competitive process during reduction of DAC by sodium borohydride. Reduction was thus inevitably accompanied by a significant loss in molecular weight. The borohydride treatment decompacted the molecules by reducing the aldehyde groups and destroying hemiacetal crosslinks. As a result, highly flexible chains were produced.
- Autor*innen der BOKU Wien:
- Kostic Mirjana
- Potthast Antje
- Rosenau Thomas
- Schiehser Sonja
- Find related publications in this database (Keywords)
- beta-elimination
- cellulose
- dialdehyde cellulose (DAC)
- gel permeation chromatography
- oxidation
- periodate
- reduction
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