Electrochemical multicomponent synthesis of 4-selanylpyrazoles under catalyst- and chemical-oxidant-free conditions

There is a resurgence of interests in organic electrochemistry, which is generally accepted as a green synthetic tool. In this context, many electrochemical methods have been developed in the past decade to access various nitrogen-centered radicals (NCRs) from readily available precursors in a controlled fashion, enabling the rapid development of many NCR-mediated new reactions for the construction of nitrogen-containing organic compounds. In this review, recent advances in the chemistry of electrochemically generated NCRs are critically highlighted, based on the electrochemical strategies for their formation and the types of NCRs. Focus is put on the mechanism for the electrochemical generation of different NCRs and their synthetic applications.

Electrochemical generation of nitrogen-centered radicals for organic synthesis

Nickel oxide nanoparticles synthesis using plant extract and evaluation of their antibacterial effects on Streptococcus mutans

As one of the most important biogeochemical cycles, the carbon dioxide (CO2) cycle between atmosphere and biosphere has a profound impact on the life on earth Therefore, the search for sustainable solutions to normalize the currently unbalanced carbon dioxide cycle is the central research topic of many scientific disciplines The green and sustainable electrocatalysis offers a very promising answer to currently unbalanced carbon dioxide cycle In this review, recent advances in electrocatalysis enabled CO2 cycle including the electrochemical carboxylation of CO2 and decarboxylative functionalization of carboxylic acids are highlighted

Carbon dioxide cycle via electrocatalysis: Electrochemical carboxylation of CO2 and decarboxylative functionalization of carboxylic acids

Sustainable electrochemical cross-dehydrogenative coupling of 4-quinolones and diorganyl diselenides

In general, halogenide anions are anodically oxidized into active species, which can be elemental halogen, halogen cations, or halogen radicals. These species subsequently react with substrates, such as olefins, ketones, or amines, to generate halogenated products. We review the mechanisms of these reactions.

Halogen-mediated electrochemical organic synthesis

Highly Regio- and Stereoselective Markovnikov Hydrosilylation of Alkynes Catalyzed by High-Nuclearity {Co14} Clusters

Organic reactions using metal–organic frameworks (MOFs) as catalysts are promising with regard to their environmentally friendly features and potential catalyst recyclability. A robust Co(II)-MOF {[Co2(L-mac)(4,4-bpt)(H2O)]·3.5H2O}n (1) and its enantiomer {[Co2(D-mac)(4,4-bpt)(H2O)]·3.5H2O}n (2) (L/D-mac = basic forms of L/D-malic acid, 4,4-Hbpt = 3,5-di(pyridin-4-yl)-4H-1,2,4-triazole) have been gram-scale prepared under solvothermal conditions. Structural analysis reveals that mac manages Co(II) ions to form 1-D chains, which are further extended via 4,4-bpt connectors into a noninterpenetrating 3D framework architecture. It was found that 1 can be as a heterogeneous catalyst for multiple organic reactions, such as azide-alkyne cycloaddition and Friedel–Crafts reactions with good isolated yields and good recycle runs (at least five times without substantial degradation). Additionally, 1 can promote hydrosilylation of alkynes under harsh conditions with moderate yield.

A robust heterogeneous Co-MOF catalyst in azide–alkyne cycloaddition and Friedel–Crafts reactions as well as hydrosilylation of alkynes

In the present study, 2D Co(II) coordination polymers (CP-1), which integrate terminal CoBrn (CoBr2 and CoBr3) sites immobilized on the framework, are synthesized at the gram level. As a special heterogeneous catalyst, CP-1 shows regioselectivity (β:α>99:1) and stereoselectivity (only E configuration) in the hydroboration of alkynes. The hydroboration reaction conditions are mild and cover a broad substrate range (31 examples). In addition, the heterogeneous catalyst can be recycled for at least five times. 

Jun-Song Jia

Papers

Halogen-mediated electrochemical organic synthesis

Highly Regio- and Stereoselective Markovnikov Hydrosilylation of Alkynes Catalyzed by High-Nuclearity {Co14} Clusters

A robust heterogeneous Co-MOF catalyst in azide–alkyne cycloaddition and Friedel–Crafts reactions as well as hydrosilylation of alkynes

Integrating Terminal CoBrn Salts into a 2D Cobalt(II) Coordination Polymer to Promote the β‐(E)‐Selective Hydroboration of Alkynes

Combining π-conjugated groups by flexible alkyl chains for ultralong organic phosphorescence by photo-activation