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Issue 21, 2017
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Development of hydrogelator-based gel-entrapped base catalysts (GEBCs) as heterogeneous basic catalysts for the synthesis of 3-acetylcoumarins

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Abstract

New gel entrapped base catalysts (GEBCs) have been prepared by entrapping some organic and inorganic bases into a solid aqueous gel matrix. Sodium alginate, gelrite and carboxymethyl chitosan were studied for the preparation of GEBCs. The phase behaviour of binary systems (gelator + water) is well studied, but ternary systems (gelator + water + base) are not much studied. Addition of a base to a (gelator + water) system drastically affected the behaviour of the gel. The phase behaviour of ternary systems (gelator + water + base) was studied by developing the corresponding ternary phase diagrams. From this study, the promising homogeneous viscous phases were converted into hard, irreversible gel beads by cross-linking the gelator with divalent cations Ca2+, Ba2+ and Sr2+. These gel beads were studied for base entrapment efficiency and leaching of the base. The GEBCs were used for the condensation of salicylaldehydes and methyl/ethyl acetoacetate to obtain 3-acetylcoumarins.

Graphical abstract: Development of hydrogelator-based gel-entrapped base catalysts (GEBCs) as heterogeneous basic catalysts for the synthesis of 3-acetylcoumarins

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Publication details

The article was received on 05 Jul 2017, accepted on 16 Sep 2017 and first published on 27 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02342A
Citation: New J. Chem., 2017,41, 12422-12428
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    Development of hydrogelator-based gel-entrapped base catalysts (GEBCs) as heterogeneous basic catalysts for the synthesis of 3-acetylcoumarins

    N. N. Korgavkar and S. D. Samant, New J. Chem., 2017, 41, 12422
    DOI: 10.1039/C7NJ02342A

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