Abstract
Bifunctional (both sulfonic and amine functionalized) mesoporous silica catalysts were prepared by hydrothermal method. (3-[2-(2-amino ethyl amino) ethyl amino] propyl trimethoxysilane) and (3-mercaptopropyl) trimethoxysilane respectively were used as amine and sulfonic sources. The synthesised bifunctional materials were fully characterized by BET, P-XRD, 29Si CPMAS-NMR, FTIR, XPS and SEM spectral analysis. FTIR and NMR results endorse the successful grafting of organic amines and sulfonic group by surface silanol of silica. The presence of of N and S groups in the catalyst material was confirmed by the XPS spectra. Catalytic activity of the bifunctional material was tested for one-pot deacetalization–knoevenagel reaction, which gave excellent yield (95 %). Catalyst is reusable with little loss of activity up to 4 runs (<6 %).
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The authors are grateful to the School of Chemistry & Physics and the College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Westville campus, Durban, South Africa for the facilities and financial support.
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Rana, S., Maddila, S., Pagadala, R. et al. Synthesis and characterization of novel bifunctional mesoporous silica catalyst and its scope for one-pot deacetalization–knoevenagel reaction. J Porous Mater 22, 353–360 (2015). https://doi.org/10.1007/s10934-014-9903-7
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DOI: https://doi.org/10.1007/s10934-014-9903-7