Results 11 to 20 of about 205,218 (235)

Recent advances in metal catalyst- and oxidant-free electrochemical C-H bond functionalization of nitrogen-containing heterocycles

open access: yesFrontiers in Chemistry, 2022
The C-H functionalization of nitrogen-containing heterocycles has emerged as a powerful strategy for the construction of carbon-carbon (C-C) and carbon-heteroatom (C-X) bonds.
Ya-Nan Li   +4 more
doaj   +1 more source

C–H bond functionalization reactions enabled by photobiocatalytic cascades

open access: yesGreen Synthesis and Catalysis, 2021
Light may participate in biocatalytic processes either by direct light-induced biocatalysis or by cascading light-induced chemical reactions with biocatalytic ones, which are acknowledged as photocatalysis.
Yuanying Li   +3 more
doaj   +1 more source

Triazole-Directed Pd-Catalyzed C(sp2)–H Oxygenation of Arenes and Alkenes [PDF]

open access: yes, 2016
Selective Pd-catalyzed C(sp2)–H oxygenation of 4-substituted 1,2,3-triazoles is described. Unlike previous metal-catalyzed C–H functionalization events, which preferentially occur at the activated heterocyclic C–H bond, the regioselective oxygenation of ...
Aizpurua Iparraguirre, Jesús María   +2 more
core   +2 more sources

Recent advances in transition-metal-free C–H functionalization of imidazo[1,2-a]pyridines

open access: yesGreen Synthesis and Catalysis, 2022
Imidazo[1,2-a]pyridines are unique nitrogen-containing organic compounds with wide applications in pharmaceuticals, natural products, material science and organometallics.
Linlin Shi, Tiantian Li, Guang-Jian Mei
doaj   +1 more source

Enzymatic functionalization of carbon-hydrogen bonds [PDF]

open access: yes, 2011
The development of new catalytic methods to functionalize carbon–hydrogen (C–H) bonds continues to progress at a rapid pace due to the significant economic and environmental benefits of these transformations over traditional synthetic methods.
Arnold, Frances H.   +2 more
core   +1 more source

A catalytic cycle for oxidation of tert-butyl methyl ether by a double C−H activation-group transfer process [PDF]

open access: yes, 2008
A square-planar, iridium(I) carbene complex is shown to effect atom and group transfer from nitrous oxide and organic azides, releasing the corresponding formate or formimidate and an iridium(I)−dinitrogen adduct.
Grubbs, Robert H., Whited, Matthew T.
core   +2 more sources

Recent Advances on Synthetic Methodology Merging C–H Functionalization and C–C Cleavage

open access: yesMolecules, 2020
The functionalization of C–H bonds has become a major thread of research in organic synthesis that can be assessed from different angles, for instance depending on the type of catalyst employed or the overall transformation that is carried out.
Hamid Azizollahi   +1 more
doaj   +1 more source

Direct Aerobic Carbonylation of C(sp2)-H and C(sp3)-H Bonds through Ni/Cu Synergistic Catalysis with DMF as the CO Source [PDF]

open access: yes, 2015
The direct carbonylation of aromatic sp2 and unactivated sp3 C–H bonds of amides was achieved via nickel/copper catalysis under atmospheric O2 with the assistance of a bidentate directing group.
Ge, Haibo, Wu, Xuesong, Zhao, Yan
core   +2 more sources

Ru-Catalyzed Selective C–H Functionalization of Pyridotriazoles with Acrylates

open access: yesSynOpen, 2021
Ruthenium-catalyzed efficient and selective C–H alkenylation of pyridotriazoles with acrylates is described. The combination of metals (Ru and Fe) plays a crucial role in achieving quantitative yields of the desired products.
Abhisek Joshi   +2 more
doaj   +1 more source

Graphane Nanoribbons: A Theoretical Study [PDF]

open access: yes, 2010
In this study, we investigate the electronic and magnetic properties of graphane nanoribbons. We find that zigzag and armchair graphane nanoribbons with H-passivated edges are nonmagnetic semiconductors.
Ataca, Can, Ciraci, Salim, Sahin, Hasan
core   +2 more sources

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