Heterogeneous catalysis; chloroacetic acid; SBA-15; Knoveneganel condensation. Heterogeneous catalysis; chloroacetic acid; SBA-15; Knoveneganel condensation.
1Department of Chemistry, Maulana Azad National Institute of Technology (MANIT), Bhopal (M.P.) 462051, India
2Ex researcher, BITS-Pilani, India
Adv. Mater. Lett., 2013, 'ICNANO 2011', 4 (1), pp 39-45
Publication Date (Web): Oct 14, 2012
Copyright © IAAM-VBRI Press
In order to develop the mild acidic nanocatalyst, ordered mesoporous silica, SBA -15 was functionalized with chloroacetic acid (SBA/CA) via post synthetic grafting technique for useful acidic conversions such as Knoveneganel condensation, Biginelli synthesis and Mannich reaction. The nanocomposites were characterized by Powder X-ray Diffraction method, N2 adsorption-desorption isotherm, 13C CP-MAS NMR, FT-IR, TPD and EDXRF. Very high activity and selectivity was observed for all the conversions under milder reaction conditions. Finally, the mechanism of the reaction is proposed and discussed.
Heterogeneous catalysis, chloroacetic acid, SBA-15, Knoveneganel condensation.