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Functionalized mesoporous materials as efficient organocatalysts for the syntheses of xanthenes.
- Source :
-
Journal of Molecular Catalysis A: Chemistry . Nov2012, Vol. 363-364, p254-264. 11p. - Publication Year :
- 2012
-
Abstract
- Highly efficient and recyclable heterogeneous organocatalysts containing acidic functional groups such as 一CO2H and 一SO3H have been synthesized by post-synthesis modification of 2D-hexagonal mesoporous silica materials SBA-15 and MCM-41, respectively. The CO2H functionalized material is obtained via Schiff-base condensation of 3-aminopropyl grafted SBA-15 with 4-formylbenzoic acid, whereas 一SO3H functionalized material is prepared via partial oxidation of 3-mercaptopropyl grafted MCM-41 with dilute aqueous H2O2. These functionalized mesoporous materials have been thoroughly characterized by powder X-ray diffraction (PXRD), nitrogen adsorption/desorption studies, transmission electron microscopy (TEM) and UV visible diffuse reflectance spectroscopy. Both these materials have highly ordered 2D-hexagonal mesoporous structures with high surface areas and well-defined pore sizes. These acid functionalized materials have been used as heterogeneous catalysts for the condensation of aromatic aldehydes with 2-napthol under mild conditions in the presence or absence of a solvent affording high yields of the value added xanthenes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13811169
- Volume :
- 363-364
- Database :
- Academic Search Index
- Journal :
- Journal of Molecular Catalysis A: Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 79874208
- Full Text :
- https://doi.org/10.1016/j.molcata.2012.06.017