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- W2953103780 abstract "adsorption/desorptionanalysis (BET), thermal analysis (TG/DTG), and X-ray diffraction (XRD) techniques. The catalytic behaviorof this new solid acid supported heterogeneous catalyst was checked in the synthesis of 14-aryl-14H-dibenzo[a, j]xanthenes by cyclocondensation reaction of β-naphthol and aryl aldehydes under solvent-freeconditions. The results showed that the novel catalyst has high activity and the desired products were obtainedin very short reaction times with high yields. Moreover, the catalyst can be easily recovered by filtration andreused at least three times with only slight reduction in its catalytic activity.Key Words : Alumina supported polyphosphoric acid, 14-Aryl-14H-dibenzo[a, j]xanthenes, Heterogeneouscatalysis, Solvent-free conditionsIntroductionThe use of homogeneous acid catalysts has some majorlimitations including no possible reuse, difficulty of productsseparation, air and moisture sensitivity and low productselectivity." @default.
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- W2953103780 date "2011-07-20" @default.
- W2953103780 modified "2023-09-26" @default.
- W2953103780 title "Preparation, Characterization and First Application of Alumina Supported Polyphosphoric Acid (PPA/Al2O3) as a Reusable Catalyst for the Synthesis of 14-Aryl-14H-dibenzo[a, j]xanthenes" @default.
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- W2953103780 doi "https://doi.org/10.5012/bkcs.2011.32.7.2311" @default.
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