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Cellulose sulfuric acid: an efficient biopolymer-based catalyst for the synthesis of 5H-dibenzo[b,i]xanthene-tetraones and spiro[dibenzo[b,i]xanthene-13,3'-indoline]-pentaones under solvent free conditions | ||
Iranian Journal of Catalysis | ||
مقاله 1، دوره 3، شماره 3، آذر 2013، صفحه 123-128 اصل مقاله (550.96 K) | ||
نویسندگان | ||
Seyyedeh Cobra Azimi* 1؛ Hassan Kefayati2 | ||
1Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran. | ||
2Department of Chemistry, Science and Research Branch, Islamic Azad University, Guilan, Iran. | ||
چکیده | ||
A practical and green method for the synthesis of 5H-dibenzo[b,i]xanthene-tetraones and spiro[dibenzo[b,i]xanthene-13,3'-indoline]-pentaones by the condensation of 2-hydroxynaphthalene-1,4-dione with aldehydes or isatins, respectively, in the presence of a catalytic amount of cellulose sulfuric acid (CSA) under solvent-free conditions at 100 °C is described. The significant features of this procedure are high yields of the products, simple work-up, solvent-free conditions, operational simplicity and non-toxicity of the catalyst. Moreover, cellulose sulfuric acid is successfully reused for four cycles without significant loss of activity. | ||
کلیدواژهها | ||
2-Hydroxynaphthalene-1,4-dione؛ Cellulose sulfuric acid؛ Xanthenes؛ Solvent-free | ||
مراجع | ||
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