Journal
CATALYSIS COMMUNICATIONS
Volume 10, Issue 14, Pages 1881-1888Publisher
ELSEVIER
DOI: 10.1016/j.catcom.2009.06.018
Keywords
Claisen-Schmidt condensation; Chalcone; Flavanone; Zn-Al hydrotalcite; Ionic liquid; Al-27 CP MAS NMR
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Funding
- CSIR, New Delhi [P23-CMM005.1]
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The Claisen-Schmidt condensation of 2'-hydroxy acetophenone and benzaldehyde to chalcone and flavanone show that calcined Zn-Al (6) hydrotalcite is active for this synthesis. Coating of ionic liquid '1-(tri-ethoxy-silyl-propyl)-3-methyl-imidazolium chloride' on Zn-Al hydrotalcites was accomplished employing incipient wetness process and on NaY, NaX, MK-5 and silica gel employing co-condensation methodology. Impregnated IL on calcined Zn-Al (6) catalysts were characterized by XRD, SEM, BET, C-13 and Al-27 NMR analysis and the activity of these catalysts were investigated for chalcone and flavanone synthesis. Al-27 CP MAS NMR technique was used to show that interaction of IL with hydrotalcite modifies the acid-base sites and is responsible for enhancement of catalyst activity. Several aromatic aldehydes were screened to assess the general applicability of the system. (c) 2009 Published by Elsevier B.V.
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