Track topics on Twitter Track topics that are important to you
Heterogeneous catalysts are preferred in fine chemical industries due to their easy recovery and reusability. Here, we report an easily scalable method of ZnO catalysts for coumarin synthesis. Nanocrystalline ZnO particles with diverse morphologies and crystallite sizes were prepared using different solvents. The change in morphology results in changes in band gaps, defects, basicity, and textural properties (surface areas, pore volumes, and pore sizes). The catalytic performances of the synthesized ZnO materials were tested using coumarin synthesis via the Knoevenagel condensation. The catalyst synthesized using methanol shows the highest activity and selectivity (conversion of 74%, selectivity of 94%) with a turnover number of 14.69. The increased activity of the ZnO synthesized in methanol is attributed to the combined effects of moderate basicity and relatively high textural properties of the sample.
This article was published in the following journal.
Name: Inorganic chemistry
Metal nanoparticles (NPs) stabilized by MOFs are very promising for catalysis, while introduction of C60 into MOFs has been very rarely used and no one reported their cooperative catalysis on organic ...
In continuation of our previous efforts towards the development of coumarin derivatives with potential vasodilatory activity, 5-phenyl coumarin derivatives were designed and synthesized. Target compou...
Herein, we report the excellent catalytic activity of DNA-AgNCs toward 4-nitrophenol reduction and a strategy for improving their catalytic performance by forming bimetallic clusters (Ag-Pd, Ag-Au and...
Despite the great successes in the controlled fabrication of nanomaterials with specific composition and morphology, it is still challenging to have the desired control on the defect sites of catalyst...
Carbon dots (CDs) have drawn much attention in recent decades due to their outstanding biocompatibility and environmental friendliness. In this work, the surface modifications of peroxidase-like carbo...
- The Martinique island (French West-Indies) is an area of high prevalence and incidence for Systemic Lupus Erythematosus (SLE), respectively 64,2/ 100000 and 4,7/ 100000. In ma...
To evaluate vessel lumen quality (gain) and patient outcomes based on treatment with a predetermined laser treatment protocol in patients presenting with varying lesion types or morphologi...
Dried fruits show promising potential for the management of blood glucose. Previous trials have reported beneficial effects of raisins on post-prandial glucose and insulin responses in hea...
Despite advances in the prevention and treatment of type 2 diabetes, its prevalence continues to rise worldwide. There is a need for new modalities to improve metabolic control in individu...
The purpose of this study is to characterise which fractionated electrogram morphologies are important to target in the catheter ablation of atrial fibrillation.
RNA that has catalytic activity. The catalytic RNA sequence folds to form a complex surface that can function as an enzyme in reactions with itself and other molecules. It may function even in the absence of protein. There are numerous examples of RNA species that are acted upon by catalytic RNA, however the scope of this enzyme class is not limited to a particular type of substrate.
Biological molecules that possess catalytic activity. They may occur naturally or be synthetically created. Enzymes are usually proteins, however CATALYTIC RNA and CATALYTIC DNA molecules have also been identified.
Molecules of DNA that possess enzymatic activity.
An antibiotic compound derived from Streptomyces niveus. It has a chemical structure similar to coumarin. Novobiocin binds to DNA gyrase, and blocks adenosine triphosphatase (ATPase) activity. (From Reynolds, Martindale The Extra Pharmacopoeia, 30th ed, p189)
Phosphoprotein with protein kinase activity that functions in the G2/M phase transition of the CELL CYCLE. It is the catalytic subunit of the MATURATION-PROMOTING FACTOR and complexes with both CYCLIN A and CYCLIN B in mammalian cells. The maximal activity of cyclin-dependent kinase 1 is achieved when it is fully dephosphorylated.