Preparation and characterization of polyethylene glycol-bis(N-methylimidazolium) dihydroxide as a basic phase-transfer catalyst and its application in Knoevenagel condensation under aqueous media
Journal Title: Asian Journal of Green Chemistry - Year 2018, Vol 2, Issue 2
Abstract
A basic phase-transfer catalyst ([PEG(mim)2][OH]2) was prepared from the reaction of polyethylene glycol-bis(N-methylimidazolium) dibromide and sodium hydroxide dissolved in water at ambient temperature. The obtained white solid was used as an efficient basic phase-transfer catalyst in Knoevenagel condensation reactions between aromatic aldehydes and active methylene compounds in water at room temperature. The reaction is done without side products and in the presence of trace amounts of the catalyst gives the corresponding products with high yields. The phase-transfer catalyst could be successfully reused without significant decrease in its activity for at least five cycles.
Authors and Affiliations
Fariba Poyafar, Mehdi Fallah-Mehrjardi, Sayed Hossein Banitaba
Keywords
Related Articles
- EP ID EP262441
- DOI 10.22631/ajgc.2017.109665.1043
- Views 78
- Downloads 0
Biosynthesis of iron oxide nanoparticles by cytoplasmic extracts of bacteria lactobacillus casei
Nowadays, tend to use nanotechnology in various fields such as medical science and pharmacology have increased. Making nanoparticles can be done by different ways, but, due to the hazards and environmental pollution caus...
Green oxidation reactions by graphene oxide-based catalyst with aqueous hydrogen peroxide
This study reports the synthesis, characterization and catalytic properties of a novel supported catalyst on the basis of nickel acetate hydrate (NiOAC) immobilized on graphene oxide (GO) modified polyethylene glycol (PE...
One-pot, clean and energy efficient synthesis of dibenzo[b,f][1,4]oxazepine derivatives promoted by ultrasound
In the present study, a variety of dibenzo [b,f][1,4] oxazepine derivatives was successfully synthesized in good yields under ultrasonic irradiation as an environmental friendly technique. This one-pot method is practica...
Proximate composition and in vitro antioxidant properties of Rhizophora mucronata plant part extract
Rhizophora mucronata is a species of mangrove widely distributed in Indian mangrove forest. It seems to be more tolerant of inundation than other mangrove species and often forms an evergreen fringe to mangrove areas. In...
Ionic liquid supported on magnetic nanoparticles as an efficient and reusable green catalyst for synthesis of benzimidazole derivatives under solvent and solvent-free conditions
The Fe3O4 nanoparticles and the supported ionic liquid (Fe3O4-IL) were produced and used as efficient magnetic catalysts to synthesize the benzimidazole derivatives under solvent and solvent-free conditions. Quantitative...