Results 141 to 150 of about 32,802 (321)

Cleavages of photochromic compounds derived from heterocycles under electrospray tandem mass spectrometry : study of the influence of the heteroatom in fragmentation mechanisms [PDF]

, 2010
In this paper we report the fragmentation pathways of chromenes derived from carbazole, dibenzofuran and dibenzothiophene, under ESI-MS/MS experimental conditions, and their relationship with structural features, specially focused on the heteroatom’s ...
Campos, Ana M. F. Oliveira, Domingues, M. R. M., Domingues, Pedro, Oliveira, M. Manuel, Peixoto, Francisco, Reis, A.   +5 more
core  

Research on synthesis of microwave‐assisted heterocyclic compounds with eco‐friendly solvents and transition metals via C–H activation

Bulletin of the Korean Chemical Society, EarlyView.
This review summarizes microwave‐assisted transition‐metal catalysis for constructing N‐ and O‐heterocycles, highlighting rapid C–H and pre‐activated C–X activation, improved selectivity, and green synthetic efficiency. Abstract Microwave‐assisted organic synthesis provides a rapid and sustainable platform for synthesizing various heterocycles ...
Woo‐Jin Park, Ye Ri Han, Hyejeong Lee
wiley   +1 more source

Химический состав нефти Крапивинского месторождения (сообщение 2) [PDF]

, 2016
Актуальность работы обусловлена необходимостью получения детальной информации о составе и строении ароматических углеводородов и гетероорганических соединений масел нефти месторождения Крапивинское из верхнеюрских отложений на территории Томской области ...
Коваленко, Елена Юрьевна, Мин, Раиса Сергеевна, Сагаченко, Татьяна Анатольевна, Яновская, Светлана Сергеевна   +3 more
core  

Operational stability of mixed Sn–Pb perovskite solar cells: Mechanisms, mitigation strategies, and perspectives

Bulletin of the Korean Chemical Society, EarlyView.
This review consolidates mechanisms and solutions for mixed Sn–Pb perovskite solar cells. It identifies Sn2+ oxidation, iodine generation, and interfacial defects as primary instabilities. It discusses progress in additives, interface passivation, alternative hole transport layers, and solvent engineering as well as future directions for achieving long‐
Lei Chen, Kai Zhu
wiley   +1 more source

Atomically precise metal cluster enzymes for pathological tissue regeneration

BMEMat, EarlyView.
Schematic illustration of atomically precise metal cluster enzymes (MCEs) for pathological tissue regeneration. Atomically precise MCEs can modulate biological processes, such as attenuation of inflammatory responses, eradication of bacterial pathogens, regulation of angiogenesis, and promotion of cell development.
Ziqiang Xiong, Zhifeng Shi, Mengqing Li, Jien Han, Haoyan Chen, Maofei Ran, Shaojian Zhong, Limin Ma, Chengyun Ning, Youzhun Fan, Zhenghua Tang, Peng Yu   +11 more
wiley   +1 more source

Metal‐Free Covalent Organic Frameworks for Photocatalytic CO2 Reduction

ChemistryEurope, EarlyView.
This review presents an environmentally sustainable strategy to address the critical issue of escalating atmospheric CO2 levels. It explores the application of metal‐free covalent organic frameworks in a photocatalytic approach, offering a green and efficient strategy for carbon dioxide reduction and contributing to climate change mitigation.
Supriti Dutta, Akhtar Alam, Pekham Chakrabortty, Pradip Pachfule   +3 more
wiley   +1 more source

Predictive, Data-Driven Design of Red-Light Photoredox Catalysts for C─Heteroatom Bond Formation. [PDF]

Angew Chem Int Ed Engl
From redox numbers to red light: Donor oxidation and core reduction potentials predict E0‐0 in cyanoarene dyes, guiding selection of an efficient red‐light catalyst, 4MeODPATPN (PC13). Under 620 nm light, PC13 facilitates Ni‐catalyzed C─heteroatom cross‐couplings (C─N, C─O, C─S) with high functional‐group tolerance and reduced hydrodehalogenation ...
Gizatullin A, Yuan T, Grotjahn S, Cavallo L, König B, Zhu C, Rueping M.   +6 more
europepmc   +3 more sources

Organophotoredox/Cobalt‐Catalyzed Retro‐Hydroformylation of Aldehydes

ChemistryEurope, EarlyView.
A new photoredox/cobalt retro‐hydroformylation is developed. This one‐pot two‐step process involves the in situ formation of the corresponding 1,4‐dihydropyridine as key intermediate. Under mild reaction conditions, alkenes are efficiently produced from a wide range of aliphatic α‐monosubstituted aldehydes, with high functional‐group tolerance.
Augustin Nouaille, Emmanuel Magnier, Corinne Gosmini, Guillaume Dagousset   +3 more
wiley   +1 more source

Precision Catalysis in Dehydrogenation of Liquid Organic Hydrogen Carriers: Molecular Structure‐Geometry‐Electronic Interplay for Enhanced Hydrogen Evolution

Carbon Energy, EarlyView.
Atomic‐scale design principles for LOHC dehydrogenation: Tailoring geometric and electronic effects in metal catalysts to bridge the molecular structure of LOHC and dehydrogenation performance. ABSTRACT The advancement of hydrogen‐based energy systems necessitates innovative solutions for safe, efficient hydrogen storage and transportation.
Yongxiao Tuo, Jingying Qu, Huailu Sun, Hongwei Gai, Xiangyuan Qu, Junlun Zhu, Xiaohui Sun, De Chen, Xiang Feng   +8 more
wiley   +1 more source

Recent Progress on Fullerene–Based Functional Materials for Energy Conversion

Carbon Energy, EarlyView.
A schematic illustration summarizing the classification, and photo‐/electro‐‐/thermo‐catalysis and energy storage applications of C60 and derivatives. ABSTRACT Efficient energy conversion and environmental protection are still constrained by rapid carrier recombination, unstable interfaces, limited active site, and so on. Owing to the unique electronic
Ying Jiang, Bo Wu, Chunru Wang
wiley   +1 more source