Abstract
Reaction with specific scavenger agents, so-called trapping, is a direct way to prove the occurrence of reactive intermediates in a reaction system, and thus to elucidate the underlying reaction mechanisms. After an introduction on chemical intermediates, chemical trapping and the peculiarities of trapping methodology in the presence of cellulose, four chapters from cellulose chemistry were selected to illustrate how trapping can be used to determine reactive intermediates, to prove the occurrence of reactive intermediates in the respective reaction system, and to finally help establish the reaction mechanism. The four topics are: radical and ionic intermediates in Lyocell dopes that cause cellulose degradation, the chemistry of cellulose in DMAc/LiCl solutions, aging of alkali cellulose under steeping conditions, and cellulose degradation during carbanilation in dimethyl sulfoxide (DMSO) mixtures.
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Abbreviations
- DMAc:
-
N,N-dimethylacetamide
- DMSO:
-
dimethyl sulfoxide
- DP:
-
degree of polymerization
- EPR:
-
electron paramagnetic resonance
- GPC:
-
gel permeation chromatography
- HPCE:
-
high-performance capillary electrophoresis
- IR:
-
infrared
- NMMO:
-
N-methylmorpholine-N-oxide
- NMR:
-
nuclear magnetic resonance
- SOMO:
-
single occupied molecular orbital
- THF:
-
tetrahydrofuran
- TLC:
-
thin-layer chromatography
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Acknowledgments
The financial support of the work by the Austrian Fonds zur Förderung der Wissenschaftlichen Forschung (projects P-14687, P-17426 and P-17428), by the Austrian Christian Doppler Research Society, by Lenzing AG, Austria, and Roche Pharmaceuticals, Switzerland, are gratefully acknowledged. We are grateful to all students, co-workers and cooperation partners that were involved in the studies described.
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Rosenau, T., Potthast, A., Kosma, P. (2006). Trapping of Reactive Intermediates to Study Reaction Mechanisms in Cellulose Chemistry. In: Klemm, D. (eds) Polysaccharides II. Advances in Polymer Science, vol 205. Springer, Berlin, Heidelberg . https://doi.org/10.1007/12_098
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DOI: https://doi.org/10.1007/12_098
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