A formal homogeneous gold-catalyzed A3-coupling, starting from benzyl alcohols, is reported for the straightforward synthesis of propargylamines. This first process where these highly valuable compounds have been synthesized, corresponding alcohols in a one-pot oxidation procedure using MnO2, followed by HAuCl4·3H2O catalyzed multicomponent reaction. The final products are obtained with very go...

In this work, a new heterogeneous catalyst, comprising gold supported on DABCO-triazole ionic liquid-modified magnetic nanoparticles (Fe3O4@DT-Au), is developed for A3-coupling reaction. This nano-catalyst characterized using different techniques, such as TEM, SEM, SEM-elemental mapping, XRD, XPS, and TGA. Using 0.05 mol% of the three-component reaction amines, aldehydes alkynes efficiently per...

Precatalyst control: [CuII(OTf)2(pyb)2]2 CH3CN (1), in which pyb is 1-(2-pyridyl)benzotriazole, enables the synthesis of a wide range propargylamines by A3 coupling reaction at room temperature absence additives. The hybrid N,N?-bidentate ligand imposes exclusive trans coordination Cu, can rotate and modulate charge distribution flux, thus orchestrating structural electronic precatalyst control...

Owing of their accessibility and wide range reactivities, alkynes make for fascinating building blocks. Either a selective alkyne carbon-carbon triple bond reaction or activation the terminal C-H may be employed to functionalize them. Monocationic coinage metal complexes with d10 electronic configuration are effective catalysts activation. Silver(I) gold(I) N-heterocyclic (NHC) systems emerging...

this study offers an exclusive class of magnetic nanoparticles supported hyperbranched polyglycerol (mnp/hpg) that was functionalized with citric acid (mnp/hpg-ca) as a host immobilization of palladium nanoparticles. the mnp/hpg-ca/pd catalyst was fully characterized using some different techniques such as thermogravimetric analysis (tga), x-ray diffraction (xrd), transmission electron microsco...

After a summary of the problem of coupling electron and proton transfer to proton pumping in cytochrome c oxidase, we present the results of our earlier and recent density functional theory calculations for the dinuclear Fe-a3-CuB reaction center in this enzyme. A specific catalytic reaction wheel diagram is constructed from the calculations, based on the structures and relative energies of the...

the catalytic acvtivity of dimeric and monomeric ortho-palladated complexes [pd{c6h2(ch2nh2-(ome)2,3,4}(µ-cl)]2)2) and [pd{c6h2(ch2nh2-(ome)2,3,4}cl(pph3)](3), was investigated in heck cross-coupling reaction. these complexes are more active and efficient catalysts for heck cross-coupling reaction. the palladium complexes 2 and 3 is employed in the heck cross-coupling reaction between styrene a...