Unconventional Synthesis of Pullulan Abietates View Full Text


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Article Info

DATE

2008-03-10

AUTHORS

Muhammad Ajaz Hussain, Thomas Heinze

ABSTRACT

Pullulan abietic acid esters (pullulan abietates) of different degree of substitution (DS) were synthesized homogeneously in N,N-dimethylacetamide using differently in situactivated abietic acid derivatives. In situ activation was achieved with p-toluenesulfonyl chloride, N,N‘-carbonyldiimidazole and iminium chloride formed from oxalyl chloride/N,N-dimethylformamide. The DS values of the biopolymer esters determined by acid-base titration after saponification indicated that in situ activation with p-toluenesulfonyl chloride is most efficient while in case of the in situ activation with N,N‘-carbonyldiimidazole almost no polymer degradation occured. The pullulan abietates were characterized by elemental analysis, GPC, FTIR-, 1H- and 13C NMR spectroscopy. More... »

PAGES

775

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00289-008-0918-6

DOI

http://dx.doi.org/10.1007/s00289-008-0918-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1048013971


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