Current Catalysis - Volume 1, Issue 3, 2012

The catalytic system Ni(COD)2/ BF3·OEt2 was studied in the ethylene oligomerization. It was shown that in the absence of tertiary phosphines the system converted ethylene into dimers with a high selectivity to butene-1 (55%). It opens a way toward atom-economical ligand-free catalytic systems for oligomerization of low molecular weight olefins. The addition of tertiary phosphines made the system active even under the Read More

Organic synthesis is a creative science involving the construction and cleavage of bond(s), which attracts particular attention because of its immense importance to life and society. The strategies regarding construction and cleavage of bonds represent the central theme in organic synthesis. Development of practical catalysts for efficient synthesis is of key importance to both academia and the chemical industry. A Read More

A green and robust solid base MgO has been synthesized by a rapid microwave-assisted solution combustion synthesis method and evaluated for multicomponent Mannich reaction under solvent-free conditions at ambient temperature in the liquid phase. The synthesized catalyst was characterized by various techniques to ascertain its phase composition and thermal stability. Catalyst characterization studies revealed t Read More

Sodium carbonate sesquiperhydrate catalyzed efficient one-pot synthesis of novel spiro[indoline-3,2'- oxirane]dicarboxamides was achieved via Knoevenagel adduct of isatin with malononitrile as the key step followed by a sequential tandem reaction. The Knoevenagel adduct transpires into oxirane with the geminal dicyano functionality being hydrolysed in to corresponding dicarboxamide. Further extension of the scope of re Read More

Silica functionalized with both ammonium and vinyl groups had been synthesized. By using the functionalized silica as a support, an immobilized platinum catalyst had been prepared and its catalytic properties in the hydrosilylation of alkenes had been investigated. Excellent catalytic performance was observed in the hydrosilylation of alkenes with triethoxysilane. The supported catalyst could be reused several times w Read More

A green chemistry approach is used for the synthesis of copper phthalocyanine (CuPc) and its application for the conversion of 2-naphthol to 2-hydroxy-1,4-naphthoquinone (HNQ, Lawsone) in alkaline aqueous solution using H2O2 as an oxidizing agent. The product obtained was compared with that of authentic sample and was found to be identical. Further the effect of amount of catalyst, amount of NaOH, amount of starti Read More

A simple and efficient method for the synthesis of polysubstituted cyclohexene derivatives has been developed. One-pot multicomponent reactions (MCRs) between aromatic aldehydes, malononitrile and nitromethane by using Rhizopus oryzae lipase as a biocatalyst in a biodegradable deep eutectic solvent (DES) were carried out. The simple quaternary ammonium DES, easily synthesized from choline chloride and urea was Read More

A Keggin heteropolyanions-based Bronsted acidic ionic liquid that combined an imidazolium cation with heteropolyanions was synthesized and used as a catalyst for regioselective mononitration of aromatic compounds in HNO3 (67%). The reactions were carried out at 60°C to 80°C with reasonable to good yields and improved para-selectivities for halogenobenzenes compared to those without the catalysts. In addition, th Read More

A simple and efficient synthesis of N-substituted imides has been developed by reaction of anhydrides with aromatic amines using tetra butyl ammonium bromide (TBAB) melt as neutral, cost-effective and recyclable ionic liquid under solvent-free i. e green conditions at 105°C for 20-45 minutes.

A series of proline-based heterogeneous polymeric organocatalysts was synthesized as monoliths via the chemo-enzymatic route. These were characterized by various techniques and the one that was synthesized with 1% crosslinker was used as the candidate catalyst in the three-component one pot reaction, i.e., Mannich-type reaction to synthesize 3-substituted 2,6-diarylpiperidin-4-ones and 4-aryldihydropyrimidi Read More

LaNi1-xFexO3 perovskites (x= 0, 0.2 and 0.4) were synthesized by the combustion method with urea and used as catalyst precursors in the partial oxidation of methane (POM). LaNiO3 was obtained as a single phase, while NiO and La(OH)3 were also detected in Fe-doped samples. The substitution of Ni by Fe in LaNiO3 perovskite resulted in a decrease in the specific surface area and an increase in the reduction temper Read More

5-Hydroxymethylfurfural (HMF) has been considered as a green platform chemical with a wide range of applications due to its rich chemistry and potential availability from renewable biomass resources. In recent years, considerable efforts have been made to transform carbohydrates into HMF using homogeneous and heterogeneous acid catalysis. In this critical review, the direct conversion of cellulose into HMF catalyzed b Read More