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Dissolution of cellulose in lithium bromide-organic solvent systems and homogeneous bromination of cellulose with N-bromosuccinimide-triphenylphosphine in lithium bromide-N,N-dimethylacetamide



Dissolution of cellulose in lithium bromide-organic solvent systems and homogeneous bromination of cellulose with N-bromosuccinimide-triphenylphosphine in lithium bromide-N,N-dimethylacetamide



Carbohydrate research 230(1): 165-177



Three solvent systems, namely lithium bromide in N,N-dimethylacetamide (DMA), N-methyl-2-pyrrolidone, or N,N-dimethylformamide, are able to dissolve cellulose. No appreciable decrease in molecular weight of cellulose was observed during the dissolution into the LiBr-DMA solvent system. The homogeneous bromination of cellulose with N-bromosuccinimide-triphenylphosphine in LiBr-DMA proceeded smoothly, and the degree of substitution by bromine of 0.9 was attained under appropriate conditions. Only the 6-hydroxyl groups were replaced with bromine, even for the sample having the highest degree of substitution. The effects of reaction conditions on the degree of substitution were studied in detail.

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Accession: 013109853

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DOI: 10.1016/s0008-6215(00)90519-6


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