oa South African Journal of Chemistry - Dodecatungstocobaltate and Sn (IV)-substituted polyoxometalate : preparation, characterization and catalytic performances in solventless synthesis of bis(indolyl)methanes : research article

Volume 65, Issue 1
  • ISSN : 0379-4350



Electrophilic substitution reaction of indole with various aldehydes and cyclohexanone were carried out in the presence of electron-transfer (KCoWO.3HO) and green Lewis acid ([(-CH)N] PMoW(Sn4+.HO)O) catalysts. These catalysts were characterized by N-adsorption measurements, FT-IR, UV-Vis, 31P NMR, TGA, cyclic voltammetry and elemental analysis. Mechanisms for their catalytic activity are proposed. Both of these catalysts can be recovered and reused.

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