Abstract
Konjac glucomannan was treated with p-toluenesulfonyl (tosyl) chloride in an interfacial reaction. The tosylation proceeded effectively and the degree of tosylation (DSTS) reached 2.34 under optimum conditions. Samples with DSTS values higher than about 0.5 were soluble in many kinds of organic solvents such as N, N-dimethylacetamide (DMA), N, N-dimethylformamide, dimethyl sulfoxide, acetone, chloroform and pyridine while they were insoluble in water, methanol and ethanol. Tosylated samples were treated with lithium chloride, lithium bromide or sodium iodide in DMA. The NMR analysis of products showed that tosyloxy groups at C-6 were substituted with halogen atoms.
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