Библиографическое описание:Synthesis of Birch Wood Xylan Sulfate in the Sulfamic Acid–Urea Melt : научное издание / V. A. Levdansky, N. V. Garyntseva, A. V. Levdansky. - Текст : непосредственный // ChemistrySelect. - 2023. - Т. 8, № 34. - P. e202302540. - This work was supported by the Russian Science Foundation, project no. 23-23-00336, https://rscf.ru/project/23-23-00336/. - ISSN 2365-6549, DOI 10.1002/slct.202302540.
Аннотация:The synthesis of polysaccharide sulfates without harmful solvents used is a serious environmental problem. A method for the synthesis of xylan sulfate using the sulfamic acid–urea melt as a sulfating agent without solvents is proposed. The melt is prepared by heating the sulfamic acid–urea mixture with a molar ratio of 1 : 1 at a temperature of 110 °C. This ratio allows significant reduction of side reactions, in particular, carbamation of xylan. Sulfation is carried out at temperatures of 110,115, 120, 125, and 130 °C. The maximum yield and degree of substitution (DSsulfate 1.40) are attained at atemperature of 115 °C. The proposed method makes it possible to synthesize xylan sulfate rapidly (for 0.5 h) and without contamination of the obtained product with toxic solvents, e. g., dimethyl sulfoxide, pyridine, etc. The composition and structure of initial and sulfated xylan are confirmed by FTIR, NMR, GC, and elemental analysis.
Держатель оригинала документа:Institute of Chemistry and Chemical Technology, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences
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