Cross-linked polystyrene-TiCl4 complex as a reusable Lewis acid catalyst for solvent-free Knoevenagel condensations of 1,3-dicarbonyl compounds with aldehydes
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DOI: 10.1016/j.catcom.2018.11.001
Abstract: Abstract Cross-linked polystyrene copolymer beads with the average particle size in the range of (50–80 mesh size) were prepared by a new method, characterized and functionalized with titanium tetrachloride to afford the corresponding polystyrene‑titanium tetrachloride… read more here.
Keywords: linked polystyrene; lewis acid; knoevenagel; cross linked ... See more keywords
Proline-Mediated Knoevenagel–Doebner Condensation in Ethanol: A Sustainable Access to p-Hydroxycinnamic Acids
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DOI: 10.1021/acssuschemeng.9b00624
Abstract: Naturally occurring p-hydroxycinnamic acids were obtained using an amine-and toxic solvent-free Knoevenagel-type pathway. This method uses not only non-toxic reagents (i.e., L-proline and magnesium oxide as catalyst) and ethanol as green solvent, all reagents and… read more here.
Keywords: ethanol; knoevenagel doebner; hydroxycinnamic acids; proline mediated ... See more keywords
The Modified Clay as a New and Eco-Friendly Catalyst for the Knoevenagel Reaction
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DOI: 10.1134/s1070427220090177
Abstract: This work aims the synthesis of substituted alkenes via Knoevenagel condensation using the clay collected from the Agadir region and modified by KF as a heterogeneous catalyst (KF-modified clay). In this context, the influence of… read more here.
Keywords: clay new; catalyst; modified clay; eco friendly ... See more keywords