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Alkynyl Ethers Of Glucans : Substituent Distribution In Propargyl-, Pentynyl- And Hexynyldextrans And -amyloses And Support For Silver Nanoparticle Formation

M. Tahir, Christian Bork, Anna Risberg, Jennifer C. Horst, Christina Komoß, Antje Vollmer, P. Mischnick
Published 2010 · Chemistry

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Alkynyldextrans with a DS in the range 0.1-1.67 have been prepared as reactive intermediates for further polymer-analogous functionalisation.. DS and substituent distribution were determined by GLC and GLCMS after hydrolysis and acetylation, or methanolysis and trimethylsilylation. Reactivity was in the order O-2 > O-4 >= O-3 with pronounced differences in the distinct patterns for propargyl ethers and its higher homologous. A large deviation from a random substituent distribution was observed. Propargyldextrans were not stable during long-time storage in the solid state, while terminal pentynyl and hexynyl ethers are. Pentynyldextrans showed structure formation of various geometries. They bound silver efficiently, yielding silver nanoparticles by reduction.
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