Thermally decomposed mesoporous Nickel Iron hydrotalcite: An active solid-base catalyst for solvent-free Knoevenagel condensation

• Published in: Journal of colloid and interface science Vol. 441; pp. 52 - 58
• Main Authors: Dumbre, Deepa K., Mozammel, Tibra, Selvakannan, PR, Hamid, Sharifah Bee Abdul, Choudhary, Vasant R., Bhargava, Suresh K.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.03.2015
• Subjects: Active methylene compounds; Aldehydes; Basicity; Bonding; Catalysts; Filtration; Iron compounds; Knoevenagel condensation; Methylene; Ni[sbnd]Fe[sbnd]HT; Nickel base alloys; Solvent-free reaction; Thermal decomposition; NiFeHT; Aldehydes; Knoevenagel condensation; Active methylene compounds; Solvent-free reaction
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2014.11.018

[Display omitted] •Solvent free Knoevenagel condensation reaction.•Mesoporous NiFe catalyst synthesis.•Ligand free CC coupling reaction.•Catalytically active NiO:Fe2O3/NiFe2O4 phase. Thermal decomposition of co-precipitated NiFeHT materials led to the formation a mesoporous NiFeHT catalyst and we have demonstrated here its active role as solid and active catalyst for the Knoevenagel condensation reaction of various aldehydes with active methylene compounds (RCH2CN, where RCN or CO2Et). High product yields are obtained at moderate temperature under solvent-free conditions and the catalyst can be easily separated from the reaction mixture, simply by filtration and reused several times without a significant loss of its activity. Since these mesoporous metal oxides derived from the NiFe hydrotalcites, their basicity mediated abstraction of the acidic protons from the active methylene compounds was responsible for their catalytic activity under solvent-free conditions.