Abstract
Pure, well soluble p-toluenesulfonyl (tosyl) starch samples with a DSTos range from 0.4 to 2.0 were prepared by reacting starch with tosyl chloride in the presence of triethylamine dissolved in the solvent N,N-dimethyl acetamide in combination with LiCl. The thermal degradation starts at a temperature of 166 °C for a sample with DSTos of 0.61 which is sufficiently high for subsequent modifications of the remaining OH groups, for instance by acylation reactions. The total DSTos can be determined using the signal of the methyl protons of the tosyl, acetyl or propionyl moieties of peracylated samples. Moreover, the NMR characterisation reveals that a predominant functionalisation at position 2 occurs. On the other hand, 6-O-tosyl starch products can be synthesised via 2-O-acetyl starch which is accessible by a new acylation procedure. The functionalisation patterns of new synthesised polymers with an unusual distribution of functional groups and high DS values were unambiguously characterised by various NMR techniques.
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Heinze, U., Haack, V., Heinze, T. (2001). New Highly Functionalised Starch Derivatives. In: Chiellini, E., Gil, H., Braunegg, G., Buchert, J., Gatenholm, P., van der Zee, M. (eds) Biorelated Polymers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-3374-7_18
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DOI: https://doi.org/10.1007/978-1-4757-3374-7_18
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