The conversion of 6-azido-6-deoxy cellulose (degree of substitution, DS 0.75) homogeneously in the ionic liquid 1-ethyl-3-methylimidazolium acetate with polyamidoamine (PAMAM) dendrons possessing an ethynyl focal moiety via the copper catalyzed Huisgen reaction (“click” reaction) yielded a novel biopolymer derivative. First to third generation PAMAM-triazolo-cellulose derivatives with DS values of up to 0.60 could be prepared, which are soluble in DMSO and for the third generation even in water. The cellulose derivatives were characterized by elemental analysis, FTIR and NMR spectroscopic methods showing neither remaining ionic liquid and other impurities nor conversion at secondary positions.
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Heinze et al. (2008) studied this question.
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