A benzimidazole-based Cu(II) complex catalyzed site-selective C-H sulfenylation of imidazo-[1,2-]pyridines using CS as a sulfur source.

A new benzimidazole-based Cu(II) complex catalyzed site-selective sulfenylation of imidazo[1,2-]pyridines with benzyl/alkyl/allyl bromides and CS at 100 °C in DMF : HO is reported. The present methodology has been developed for the synthesis of 3-sulfenyl imidazo[1,2-]pyridines in good yields with a broad substrate scope. In this protocol, CS, commonly known as a non-polar small molecule bioregulator (SMB), is converted to valuable sulfenylated imidazo[1,2-]pyridine derivatives.

A suitably fabricated ternary nanocomposite (Cu-CuO@rGO-SiO) as a sustainable and common heterogeneous catalyst for C-S, C-O and C-N coupling reactions.

A hybrid composite based on π-electron rich reduced graphene oxide (rGO) and mesoporous silica (SiO) was prepared and decorated with copper species to afford a ternary nanocomposite material (Cu-CuO@rGO-SiO). This copper-based nanocomposite was successfully used as a robust and multi-tasking heterogeneous catalyst for most common cross-coupling reactions ( C-S, C-O and C-N coupling). A broad range of catalytic activities are believed to be originated from the synergism of different co-existing copper species (Cu(0) and CuO) and facile charge transfer from the metal ions towards rGO-SiO matrices, as established from XPS and other studies.

A Recent Update on Rhodamine Dye Based Sensor Molecules: A Review.

Herein we have discussed such important modified rhodamine compounds which have been used as chemosensors for the last 7-8 years. This review covered some chemosensors for the detection of metal ions like Al(III), Cu(II), Hg(II), Co(II), Fe(III), Au(III), Cr(III), and some anion like CN. The selectivity, sensitivity, photophysical properties (i.

Influence of ortho group in rhodamine B hydrazide based Schiff base for selective recognition of Cu and Fe ions: A mechanistic approach by DFT and colorimetric studies.

Herein we have implemented a computational approach in designing sensor molecules for the selective recognition of Cu and Fe ions. Seven rhodamine B hydrazide-based Schiff base derivatives were designed and analysed their chemosensing properties against Cu and Fe ions in ethanol solution theoretically. The theoretical calculations revealed that the selective recognition of Cu and Fe ions takes place via spirolactam ring-opening and there is a pivotal role of ortho substituents and N-heteroatoms.

Metal-free multicomponent approach for the synthesis of propargylamine: a review.

Propargylamines are important classes of alkyne coupled amine compounds used in heterocyclic chemistry and pharmaceuticals chemistry and have a large impact as a pharmacophore used in medicinal chemistry. One of the straightforward approaches for the synthesis of this class of compound is A3 coupling, a three-component coupling reaction among aldehyde, alkyne (terminal acetylene) and amine. However, there are many methods other than conventional three component alkyne-aldehyde-amine (A3) coupling which have also been reported for the synthesis of propargylamine.

Bio-molecule functionalized rapid one-pot green synthesis of silver nanoparticles and their efficacy toward the multidrug resistant (MDR) gut bacteria of silkworms ().

The present study aimed to synthesise bio-molecule functionalized silver nanoparticles (AgNPs) using leaf extract from mulberry variety S-1635 ( L.) and to explore its antibacterial efficacy against multidrug resistant (MDR) gut bacteria isolated from natural infection observed from silkworm larvae in rearing conditions. AgNPs formation was established by surface plasmon resonance at 480 nm.

Effect of feed supplementation with biosynthesized silver nanoparticles using leaf extract of Morus indica L. V1 on Bombyx mori L. (Lepidoptera: Bombycidae).

Herein, we report the synthesis of silver nanoparticles (AgNPs) by a green route using the aqueous leaf extract of Morus indica L. V1. The synthesized AgNPs exhibited maximum UV-Vis absorbance at 460 nm due to surface plasmon resonance.

Effect of the -hydroxy group of salicylaldehyde in the A coupling reaction: A metal-catalyst-free synthesis of propargylamine.

The synthesis of propargylamines via A coupling mostly under metal-catalyzed procedures is well known. This work invented an unprecedented effect of salicylaldehyde, one of the A coupling partners, which could lead to the formation of propargylamine, an important pharmaceutical building block, in the absence of any metal catalyst and under mild conditions. The role of the hydroxy group in position of salicylaldehyde has been explored, which presumably activates the C-H bond of the terminal alkyne leading to the formation of propargylamines in good to excellent yields, thus negating the function of the metal catalyst.