TY - EJOUR
AU - Azimi, Seyyedeh Cobra
AU - Kefayati, Hassan
PY - 2024
DA - February
TI - 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
T2 - Iranian Journal of Catalysis
VL - 3
L1 - https://oiccpress.com/iranian-journal-of-catalysis/article/cellulose-sulfuric-acid-an-efficient-biopolymer-based-catalyst-for-the-synthesis-of-5h-dibenzobixanthene-tetraones-and-spirodibenzobixanthene-133-indoline-pentaones-under-solvent-free-condi/
N2 - 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.
IS - 3
PB - OICC Press
KW - Solvent-free, Xanthenes, 2-Hydroxynaphthalene-1, 4-dione, Cellulose sulfuric acid 
EN -