Marine solids/NaNO3: As Natural and Efficient Catalysts for Aldol condensation
A new and efficient method have been developed for the synthesis of Î±,Î²-unsaturated carbonyl compounds from various aldehydes and ketones, using marine calcinated coral/NaNO3 and cuttlebone/NaNO3, as natural and efficient catalysts for cross aldol condensation. The aim of present study was to study the marine solids/NaNO3: as natural and efficient catalyst for Aldol condensation. The materials were purchased from Merck and Aldrich Companies. The IR spectra were recorded on a Perkin-Elmer RXI infrared spectrometer. H NMR spectra were recorded on a 400 MHz Brucker FT-NMR spectrometer. The SEM image was recorded on 1455 VP LEO-Germany. TLC accomplished the purity of substrates and reactions monitored on silica gel (Merck, Germany) Polygram SIGL/UV254 plates. The melting points are uncorrected. Results showed that, the marine solid are efficient catalysts for aldol condensation, but cuttlebone/NaNO3 catalyze this reaction in shorter time (1 hr) than calcinated coral/NaNO3 (6 hr). However, these marine solids have several advantages such as small amount of the catalyst, good absorbent natural solid, easy to handle, and products in good-to-high yields. In conclusion we found marine catalysts, Calcinated Cuttlebone/NaNO3 or Coral/NaNO3 to be an effective catalyst for aldol condensation from ketones having Î±-hydrogens and aldehydes in 50 % ethanol at reflux conditions. The Î±,Î²-unsaturated carbonyl products were obtained in good to high yields. This method offered marked improvement compared to previously reported ones.
The author hereby transfers, assigns, or conveys all copyright ownership to the International Journal of Ayurvedic Medicine (IJAM). By this transfer, the article becomes the property of the IJAM and may not be published elsewhere without written permission from the IJAM.
This transfer of copyright also implies transfer of rights for printed, electronic, microfilm, and facsimile publication. No royalty or other monetary compensation will be received for transferring the copyright of the article to the IJAM.
The IJAM, in turn, grants each author the right to republish the article in any book for which he or she is the author or editor, without paying royalties to the IJAM, subject to the express conditions that (a) the author notify IJAM in advance in writing of this republication and (b) a credit line attributes the original publication to IJAM.