Results 81 to 90 of about 101,033 (289)

Aromaticities of Five Membered Heterocycles through Dimethyldihydropyrenes Probe by Magnetic and Geometric Criteria

Journal of Chemistry, 2015
Aromaticities of five membered heterocycles, containing up to three heteroatoms, are quantified through the dimethyldihydropyrene (DHP) probe. Bond fixation caused by the fusion of heterocycles to the dimethyldihydropyrene nucleus (DHPN) was measured by ...
Maria, Khurshid Ayub
doaj   +1 more source

Palladium-catalyzed heteroallylation of unactivated alkenes – synthesis of citalopram [PDF]

, 2013
A palladium-catalyzed difunctionalization of unactivated alkenes with tethered nucleophiles is reported. The versatile reaction occurs with simple allylic halides and can be carried out under air.
Adams, Alcaide, Alexanian, Arai, Balme, Beccalli, Byers, Carruthers, Danishefsky, Deprez, Desai, Doroski, Fries, Fries, Fukuda, Giese, Guo, Hayashi, Hayashi, Heck, Hegedus, Hickman, Hopkins, Ingalls, Jensen, Kang, Keller, Kimura, Koester, Komeyama, Kumar, Larock, Larock, Le Bras, Lei, Li, Lira, Liskin, Liu, Liwosz, Lovering, Lu, Ma, Ma, Ma, Ma, Mai, Manzoni, McDonald, Michael, Minatti, Muñiz, Muñiz, Muñiz, Nadin, Neukom, Newman, Newman, Ney, Ney, Nicolai, Nicolai, Nicolai, Nicolai, Nishimura, Pappo, Ritchie, Rosewall, Schuch, Schultz, Sehnal, Semmelhack, Sibbald, Sibbald, Streuff, Sun, Tietze, Tietze, Trost, Trost, Trost, Tsuji, VanRheenen, Vedantham, Wakabayashi, Weaver, Wolfe, Wolfe, Wolfe, Wolfe, Wu, Xu, Yip, Yip, Yorimitsu, Yorimitsu, Zeni, Zhao, Zhu   +98 more
core   +1 more source

FeCoNiCuPt High‐Entropy Alloy Boosts Photocatalytic Hydrogen Production on Protonated Graphitic Carbon Nitride

Advanced Science, EarlyView.
In this study, FeCoNiCuPt high‐entropy alloy particles (HEA) are loaded onto protonated g‐C3N4 nanosheets (HCN NSs) to construct HEA/HCN composites through an electrostatic self‐assembly method. Protonation treatment enriches the surface of g‐C3N4 nanosheets with abundant active sites and enhances their interfacial charge separation capability ...
Yunzhu Zang, Jiali Ren, Yanjun Xue, Jian Tian   +3 more
wiley   +1 more source

Stabilizing Atomically Dispersed Au With Adjacent Pt for Spatially Precise Molecule Recognition

Advanced Science, EarlyView.
A strategy to stabilize atomically dispersed Au catalysts by introducing Pt atoms into CeO2 supports is presented. Pt incorporation prevents Au aggregation, enhances Au‐O orbital coupling, and enables precise recognition of multi‐functionalized molecules, improving catalytic performance and the structural stability of Au‐based catalysts in ...
Rui Tang, Xiangyu Xiao, Jingyi Yao, Qing Wang, Qijing Gao, Nan Zhou, Fanyi Kong, Dingguan Liang, Kangning Dong, Liang Xiong, Yuwei Cao, Zhendong Lei, Liang Tang   +12 more
wiley   +1 more source

Polyoxometalate catalysts for the synthesis of N-heterocycles

Polyoxometalates
N-Heterocycle compounds are crucial scaffolds in natural products, synthetic molecules, agricultural chemicals, and pharmaceuticals. Hence, green catalytic systems for the synthesis of N-heterocycles have been widely researched in organic synthesis and ...
Qilong Hu, Ke Li, Xuejiao Chen, Yufeng Liu, Guoping Yang   +4 more
doaj   +1 more source

Precise Tailoring 3D Printed In Situ Toughening Low‐k Microwave Transparent Structure via Thiol‐acrylate Chain Transfer Behavior

Advanced Science, EarlyView.
An in situ thiol–acrylate chain transfer‐mediated toughening strategy is introduced for Digital Light Processing (DLP) printing. Benefiting from its excellent printability, a printed gyroid lattice‐filled plate (100 µm wall thickness) achieves 92% transmittance at 10 GHz under a 50° incidence angle following structural optimization. ABSTRACT The unique
Ce Bian, Kai Zheng, Ruoyu Chen, Wansong Gu, Guanxiang Zhong, Difei Liang, Longjiang Deng, Hetao Chu   +7 more
wiley   +1 more source

Reactivity and Stability of (Hetero)Benzylic Alkenes via the Wittig Olefination Reaction

Molecules
Wittig olefination at hetero-benzylic positions for electron-deficient and electron-rich heterocycles has been studied. The electronic effects of some commonly used protective groups associated with the N-heterocycles were also investigated for alkenes ...
Ajmir Khan, Mohammed G. Sarwar, Sher Ali
doaj   +1 more source

Cation-pi interactions in aromatics of biological and medicinal interest: Electrostatic potential surfaces as a useful qualitative guide [PDF]

, 1996
The cation-pi interaction is an important, general force for molecular recognition in biological receptors. Through the sidechains of aromatic amino acids, novel binding sites for cationic ligands such as acetylcholine can be constructed.
Dougherty, Dennis A., Mecozzi, Sandro, West, Anthony P., Jr.   +2 more
core  

Cyclopropanation of carbon-carbon double bonds in ring d of ergot alkaloids [PDF]

, 2013
Some ergot alkaloid derivatives containing a double bond in ring D have been reacted with diazomethane/palladium diacetate reagent to result in formation of a fused cyclopropane ring.
Dörnyei, Gábor, Hajós, György, Incze, Mária, Kovács, Péter, Lejtoviczné Egyed, Orsolya, Szántay, Csaba (Id.)   +5 more
core   +1 more source

A BNAlP-heterocycle

Chemical Communications
Combining a phosphaalumene with its lighter congener, an iminoborane afforded a species with a BNAlP heterocycle.
Tim Wellnitz, Leonie Wüst, Holger Braunschweig, Christian Hering-Junghans   +3 more
openaire   +2 more sources