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Infrared Irradiation‐Assisted Solvent‐Free Pd‐Catalyzed (Hetero)aryl‐aryl Coupling via C−H Bond Activation

No solvent needed: Pd-catalyzed (hetero)aryl–aryl coupling via C−H bond activation is proven in solvent-free conditions under IR irradiation as effective and convenient energy source. The reaction efficiently works on several conjugated cores and tolerates several functional groups on aryl iodides used as coupling partners. The protocol opens the way...

A Waste‐Minimized Approach to Cassar‐Heck Reaction Based on POLITAG‐Pd0 Heterogeneous Catalyst and Recoverable Acetonitrile Azeotrope

Waste not: The Cassar-Heck reaction affords the synthesis of different alkynyl compounds in high isolated yields and low E-factor values in a waste-minimized protocol. The careful selection of POLITAG-Pd0 (POLymeric Ionic TAG) catalyst and the reaction medium lead to high turnover number (43500) and turnover frequency (2806 h−1) values. Most importantly,...

Photoredox‐Catalyzed Simultaneous Olefin Hydrogenation and Alcohol Oxidation over Crystalline Porous Polymeric Carbon Nitride

A concerted effort: A crystalline porous polymeric carbon nitride is constructed for concerted catalysis using photogenerated electron-hole pairs, in which hydrogen generation followed by in-situ utilization is achieved for olefin hydrogenation. Simultaneously, various alcohols are selectively transformed to valuable aldehydes or ketones. Abstract...

Electrochemical Oxidative Syntheses of NH‐Sulfoximines, NH‐Sulfonimidamides and Dibenzothiazines via Anodically Generated Hypervalent Iodine Intermediates

Sprinkles of iodine: A method is reported for the direct electrochemical oxidative synthesis of NH-sulfoximines, NH-sulfonimidamides, and dibenzothiazines, respectively, with catalysis by an iodoarene(I)/iodoarene(III) redox couple. The method requires only a catalytic amount of iodoarene, and a hypervalent iodine catalyst is generated in situ from...

Platinum catalyzed alkene hydrosilylation: solvent‐free process development from batch to a membrane‐integrated continuous process

The integration of a membrane separation protocol with the platinum-catalyzed hydrosilylation of olefins was investigated. The catalytic reaction was first optimized in batch where [Pt(IPr*)(DMS)Cl 2 ] (IPr* =  1,3-bis[2,6-bis(diphenylmethyl)-4-methylphenyl]imidazol- 2-ylidene , DMS = dimethyl sulfide) demonstrated superior activity compared to the...

Amorphous Fe(OH)3 Passivating CeO2 Nanorods: A Noble‐Metal‐Free Photocatalyst for Water Oxidation

In hot water: CeO2/A−Fe(OH)3 composites synthesized by a secondary water bath at 100 °C exhibit superior photocatalytic activity. A−Fe(OH)3 increases specific surface area, passivates the surface of CeO2, and reduces the activation energy of water oxidation. This work provides a new insight into exploring amorphous cocatalysts to enhance photocatalytic...

Solvent‐Free Mechanochemical Post‐Polymerization Modification of Ionic Polymers

Mechanochemical modification: A solvent-free mechanochemical reaction is employed on reactants of different solubilities. The formation of imine bonds between a polyether with ammonium pendant groups and an aromatic aldehyde is induced via a vibrational ball-milling technique, leading to the fast and efficient production of imines in the pendant groups....

Upgrading of Ethanol to 1,1‐Diethoxyethane by Proton Exchange Membrane Electrolysis

The direct acetalization of ethanol is a significant challenge for upgrading bioethanol to value-added chemicals. Herein, 1,1-diethoxyethane (DEE) was selectively synthesized by the electrolysis of ethanol using a proton exchange membrane (PEM) reactor. In the PEM reactor, a Pt/C catalyst promoted the electro-oxidation of ethanol to acetaldehyde. The...

Coating polymeric carbon nitride on conductive carbon cloth to promote charge separation for photocatalytic water splitting

The use of polymeric carbon nitride (PCN) for photoredox catalysis is innovating and promoting us toward sustainable energy economy. One of the drawbacks of this metal-free photocatalyst is its insufficient charge separation and transfer properties. Herein, we has achieved a metal-free system by anchoring PCN on conductive carbon cloth, which faciliates...

Methanol Synthesis by Hydrogenation of Hybrid CO2−CO Feeds

CO gives and takes: The impact of CO on copper and ZnO−ZrO2 catalysts for CO2-to-methanol is assessed in cycling tests with hybrid CO2−CO feeds and contrasted to In2O3-based systems. CO addition promotes all catalyst families for structural and mechanistic reasons. Mild-to-moderate deactivation is observed upon its removal for copper- and In2O3-based...

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