Results 271 to 280 of about 146,642 (386)

Cooperative Photocatalysis of 9,10‐Phenanthrenequinone and Sn(OTf)2 for Direct Mannich Reaction of Ethers via Hydrogen Atom Transfer Pathway

Advanced Synthesis &Catalysis, EarlyView.
A dual photocatalytic system of o‐PQ and Sn(OTf)2 enables visible light‐induced Mannich‐type addition of ethers to nitrones via Csp³–H activation. This oxidant‐free method offers broad scope and good yields. Mechanistic studies suggest that a photoexcited o‐PQ–Sn(II) complex mediates hydrogen atom transfer to form α‐oxy radicals for nitrone addition. A
Pradip Ramdas Thorve, Hun Young Kim, Kyungsoo Oh   +2 more
wiley   +1 more source

Carbon quantum dots from silymarin extraction for multi-fluorescent sensors, photocatalysis, and anticancer activity applications. [PDF]

Sci Rep
Elkun S, Ghali M, Sharshar T, Mosaad MM.
europepmc   +1 more source

Fe‐Photocatalyzed Decarboxylative Giese‐Type Reaction of α‐N, O or S Carboxylic Acids: Insight into the Mechanism of the Radical Formation

Advanced Synthesis &Catalysis, EarlyView.
Electron‐deficient alkenes can be functionalized with α‐amino, α‐alkoxy and α‐alkylthio radicals formed by Fe‐photocatalyzed decarboxylation of the corresponding carboxylic acids. The reactions proceed under smooth ligandless conditions with inexpensive base and in the absence of oxidant. A mechanistic computational TD‐DFT study supports the occurrence
Fernando Pérez‐Maseda, María Martín, Jorge Labrador‐Santiago, Inés Corral, Diego J. Cárdenas   +4 more
wiley   +1 more source

Photoredox‐Catalyzed Synthesis of a Novel Class of Fluoroalkyl Pyrazolones

Advanced Synthesis &Catalysis, EarlyView.
A photoredox strategy enables regioselective synthesis of fluoroalkyl 2‐pyrazolin‐5‐ones via radical addition and cyclization. This mild, metal‐free method shows a broad substrate scope, operates in batch and flow systems, and offers a sustainable approach to fluorinated heterocycles with potential applications in medicinal chemistry.
Emanuele F. Pissinati, Meysam Azizzade, Till Opatz, Márcio W. Paixão   +3 more
wiley   +1 more source

Recent Advancements in Photocatalytic Synthesis of Five Membered Nitrogen Heterocycles and Their Derivatives. [PDF]

Molecules
Haider Z, Archana R, Ju H.
europepmc   +1 more source

Electrocatalytic Dehydrogenative Lactonization of Benzylic Alcohols: A Sustainable Access to Phthalides via N‐hydroxyphthalimide Mediation

Advanced Synthesis &Catalysis, EarlyView.
A mild, scalable electrocatalytic method for direct lactonization of benzylic alcohols to phthalides using N‐hydroxyphthalimide as a redox mediator is reported. This metal‐free process proceeds via a phthalimide‐N‐oxyl‐mediated hydrogen atom transfer mechanism, shows broad scope with good to excellent yields, and enables late‐stage functionalizations ...
Pietro Ronco, Antonia Simi, Enrico Lunghi, Emanuele Casali, Giovanni Lenardon, Alessio Porta, Giuseppe Zanoni   +6 more
wiley   +1 more source

Photosulfoxidation Catalysis as the Driving Principle for Deazaoxaflavin Photoredox Catalyst Formation. [PDF]

J Org Chem
Křížová K, Ismail R, Nguyen TA, Bříza M, Geleverya AO, Ciotta C, Guerra VLP, Kovaříček P.   +7 more
europepmc   +1 more source

Proton‐Coupled Electron Transfer Processes in the Decarboxylative Synthesis of C‐4 Substituted Chroman‐2‐Ones

Advanced Synthesis &Catalysis, EarlyView.
This research presents a new mild photocatalytic method enables C‐4 alkylation of chroman‐2‐one derivatives with primary alkyl radicals. This radicals are generated via oxidative PCET process. Developed approach offers broad substrate scope, scalability under photo‐flow conditions, and mechanistic evidence supports a decarboxylation pathway under polar
Ewelina Kowalska, Benedetta Carli, José Alemán, Leyre Marzo, Anna Albrecht   +4 more
wiley   +1 more source

Gas‐ and Liquid‐Phase Catalysts for Solar‐Driven Catalytic Ammonia Decomposition

Advanced Sustainable Systems, EarlyView.
Amid the drive toward carbon‐neutral hydrogen, this review analyzes photocatalytic ammonia decomposition in gas‐ and liquid‐phase systems. It examines catalyst families—TiO2, ZnO, Ru, single‐atom, and antenna–reactor designs. This study summarizes advances in bandgap tuning, active‐site and cocatalyst engineering, photothermal coupling, and machine ...
Zhuohao Yang, Xuechen Jing, Ruhan Liu, Zhipeng Cao, Zongyou Yin   +4 more
wiley   +1 more source

Density Functional Theory Study on the Impact of External Magnetic Fields on the Photocatalytic Properties of Metal‐Doped Titanium Dioxide

Advanced Theory and Simulations, EarlyView.
This study reveals how external magnetic fields enhance photocatalysis in transition metal‐doped anatase TiO2. Using DFT+U, it analyzes band structure, charge distribution, light absorption, and spin density, providing strong evidence for a spin polarization‐driven magnetic field‐photocatalysis coupling mechanism. Abstract Home‐made pure TiO2, Fe/TiO2,
Pengsheng Liu, Xiaoan Mao
wiley   +1 more source