Results 71 to 80 of about 23,008 (222)

Direct Access to Chiral Piperidines by Enantioselective HAT‐Initiated C(sp3)─H Oxidation

Angewandte Chemie, EarlyView.
The direct desymmetrization of piperidines is achieved through manganese‐catalyzed enantioselective α‐C(sp3)─H oxidation with hydrogen peroxide, affording versatile chiral N,O‐acetals in good yields and with high enantio‐ and diastereoselectivity. These intermediates provide access to diverse functionalized piperidines with retention of chirality ...
Sethuraman Muthuramalingam, Josep M. Luis, Arnau Call, Quentin Lefebvre, Matthew S. Sigman, Miquel Costas   +5 more
wiley   +2 more sources

Late-stage adenine N6-alkylation of nucleos(t)ides and oligonucleotides via photoredox and copper co-catalytic decarboxylative C(sp3)–N coupling

Nature Communications
Nucleosi(ti)des and nucleic acids with N6 modified adenosine play an important role in the areas of disease diagnosis and treatment, biological chemistry, as well as nanotechnology.
Ruoqian Xie, Guolan Xiao, Wanlu Li, Wenhao Luochen, Madiha Butt, Yingchuan Que, Xiaorong Li, Yangyan Li, Litao Sun, Gang Chen   +9 more
doaj   +1 more source

4,4’-Bis(4-octylphenoxy)-2,2’-bipyridine

Molbank, 2009
4,4’-Bis(4-octylphenoxy)-2,2’-bipyridine which can be used in complexes of ruthenium was synthesized. This ligand bears a long chain for the purpose of increasing the solubility of the final complex.
Zhen-Ting Du, Jun-Ru Wang, Ru Liu, Yan Xu   +3 more
doaj   +1 more source

Multiscale Design of Anion Exchange Membrane‐Based Seawater Electrolysis for Sustainable Hydrogen Production

Advanced Energy Materials, EarlyView.
Direct seawater electrolysis using anion exchange membranes is emerging as a promising route for sustainable hydrogen production. This review summarizes multiscale design strategies from seawater chemistry and OER–ClER selectivity to catalysts, membranes, MEAs, cells, stacks, and system integration, providing a roadmap toward selective, durable, and ...
Chiho Kim, Geunhee Yuk, Jong‐Hyeok Park, Shin‐woo Myeong, Jun Seok Ha, Won Tae Hong, Jung Kyu Kim, Sung Mook Choi   +7 more
wiley   +1 more source

Cobalt‐Catalyzed C─N Bond Formation via Metal‐Hydride Hydrogen Atom Transfer (MHAT)

Angewandte Chemie, EarlyView.
Cobalt‐catalyzed metal‐hydride hydrogen atom transfer (Co‐MHAT) converts simple alkenes into C─N bonds under mild, near‐neutral conditions. A shared Co─H‐initiated radical/organocobalt intermediate is channeled into radical trapping, radical‐polar crossover, or radical ligand transfer, unifying hydroamination, hydroazidation, hydroamidation, and remote
Arman Khosravi, Ming‐Yu Ngai
wiley   +2 more sources

Double Reduction of Ph3B to a Dianionic Borane With a Powerful SrI Intermediate

Angewandte Chemie, EarlyView.
Although dianionic boranes follow the octet rule and are isoelectronic to carbanions or amines, the high electron density combined with the electropositive nature of the B center make them highly unstable species. In this study, we present synthesis and full characterization of a complex in which Ph3B2− is sandwiched between two Sr2+ ions and describe ...
Michael Morasch, Marcel A. Schmidt, Tanuja Tewari, Jens Langer, Sjoerd Harder   +4 more
wiley   +2 more sources

A three-armed cryptand with triazine and pyridine units: synthesis, structure and complexation with polycyclic aromatic compounds

Beilstein Journal of Organic Chemistry, 2018
The aromatic nucleophilic substitution reaction based synthesis of a three-armed cryptand displaying 2,4,6-triphenyl-1,3,5-triazine units as caps and pyridine rings in the bridges, along with NMR, MS and molecular modelling-based structural analysis of ...
Claudia Lar, Adrian Woiczechowski-Pop, Attila Bende, Ioana Georgeta Grosu, Natalia Miklášová, Elena Bogdan, Niculina Daniela Hădade, Anamaria Terec, Ion Grosu   +8 more
doaj   +1 more source

Reusable Polyphenol Building Blocks Enable Recyclable Epoxy‐Amine Thermosets via Methanolysis

Angewandte Chemie, EarlyView.
A biobased epoxy–amine platform was developed using functional building blocks derived from polyphenols. These thermosets exhibited tunable mechanical and thermal properties, together with efficient, catalyst‐free chemical recycling via methanolysis. Beyond the recovery of reusable building blocks, the recycled polyols could be further upcycled into ...
Yi‐Min Tu, Yuhang Jiang, Kun Li, Qing Cao, Yizhe Pan, Christoph Tzschucke, Andreas J. Achazi, Rainer Haag   +7 more
wiley   +2 more sources

Perhalogenated pyrimidine scaffolds. Reactions of 5-chloro-2,4,6-trifluoropyrimidine with nitrogen centred nucleophiles

Beilstein Journal of Organic Chemistry, 2008
BackgroundHighly functionalised pyrimidine derivatives are of great importance to the life-science industries and there exists a need for efficient synthetic methodology that allows the synthesis of polysubstituted pyrimidine derivatives that are ...
Emma L. Parks, Graham Sandford, John A. Christopher, David D. Miller   +3 more
doaj   +1 more source

Further Successes of the Meisenheimer Model

Applied Sciences, 2012
Our simple Meisenheimer model for predicting the principal site for nucleophilic substitution in aromatic perfluorocarbons is further tested on a series of recently published reactions in liquid ammonia primarily from Malykhin and coworkers.
Jon Baker Baker, Max Muir
doaj   +1 more source