Arylation of 2-Phenylimidazo[1,2-a]pyridine Using Silver(I) Carboxylate

Phosphine-free palladium-catalyzed direct arylation of 2-phenyl-imidazo[1,2-a]pyridine has been developed with the concept of using silver(I) carboxylate. is protocol efficiently catalyzes the C-H arylation of 2-phenyl-imidazo[1,2-a]pyridine with aryl iodides to afford the corresponding 2-phenyl-3-aryl-imidazo[1,2-a]pyridines in moderate to-good yields

Phosphine-Free Palladium-Catalyzed Direct C-3 Arylation of 2-Phenylimidazo[1,2-a]pyridine Using Silver(I) Carboxylate

Phosphine-free palladium-catalyzed direct arylation of 2-phenyl-imidazo[1,2-a]pyridine has been developed with the concept of using silver(I) carboxylate. This protocol efficiently catalyzes the C-H arylation of 2-phenyl-imidazo[1,2-a]pyridine with aryl iodides to afford the corresponding 2-phenyl-3-aryl-imidazo[1,2-a]pyridines in moderate to-good yields

A Convenient Synthesis of C-3-Aryloxymethyl Imidazo[1,2-a]Pyridine Derivatives

Imidazo[1,2-a]pyridine-based tosylhydrazone was prepared and treated with K2CO3 in dioxane at 110°C to generate the corresponding carbene in situ. It was coupled with a variety of aryl alcohols in one pot to obtain a series of imidazo[1,2-a]pyridine derivatives possessing aryl ether moiety at C-3 position

Tailoring the interfacial interactions of van der Waals 1T-MoS2/C60 heterostructures for high-performance hydrogen evolution reaction electrocatalysis

Fullerene-based low-dimensional (LD) heterostructures have emerged as excellent energy conversion materials. We constructed van der Waals 1T-MoS2/C60 0D-2D heterostructures via a one-pot synthetic approach for catalytic hydrogen generation. The interfacial 1T-MoS2-C60 and C60-C60 interactions as well as their electrocatalytic properties were finely controlled by varying the weight percentages of the fullerenes. 1T-MoS2 platforms provided a novel template for the formation of C60 nanosheets (NSs) within a very narrow fullerene concentration range. The heterostructure domains of 1T-MoS2 and C60 NSs exhibited excellent hydrogen evolution reaction (HER) performances, with one of the lowest onset potentials and ΔGH* values for LD non-precious nanomaterials reported to date.</p

Cylindrical C Fullertubes: A Highly Active Metal-Free O -Reduction Electrocatalyst

A new isolation protocol was recently reported for highly purified metallic Fullertubes D -C , D -C , and D -C which exhibit unique electronic features. Here, we report the oxygen reduction electrocatalytic behavior of C , C (spheroidal fullerenes), and C , C , and C (tubular fullerenes) using a combination of experimental and theoretical approaches. C (a metal-free catalyst) displayed remarkable oxygen reduction reaction (ORR) activity, with an onset potential of 0.85 V and a halfway potential of 0.75 V, which are close to the state-of-the-art Pt/C benchmark catalyst values. We achieved an excellent power density of 0.75 W cm using C as a modified cathode in a proton-exchange membrane fuel cell, comparable to other recently reported efficient metal-free catalysts. Combined band structure (experimentally calculated) and free-energy (DFT) investigations show that both favorable energy-level alignment active catalytic sites on the carbon cage are responsible for the superior activity of C