Results 31 to 40 of about 211,355 (114)

Modification of Purine and Pyrimidine Nucleosides by Direct C-H Bond Activation

Molecules, 2015
Transition metal-catalyzed modifications of the activated heterocyclic bases of nucleosides as well as DNA or RNA fragments employing traditional cross-coupling methods have been well-established in nucleic acid chemistry.
Yong Liang, Stanislaw F. Wnuk
doaj   +1 more source

Different Patterns of Pd-Promoted C-H Bond Activation in (Z)-4-Hetarylidene-5(4H)-oxazolones and Consequences in Photophysical Properties

Inorganics
This work aims to amplify the fluorescence of (Z)-4-hetarylidene-5(4H)-oxazolones 1 by suppression of the hula-twist non-radiative deactivation pathway by C^N-orthopalladation of the 4-hetarylidene ring.
Miguel Martínez, David Dalmau, Olga Crespo, Pilar García-Orduña, Fernando Lahoz, Antonio Martín, Esteban P. Urriolabeitia   +6 more
doaj   +1 more source

Successive Activation of C–H and C–O Bonds of Vinyl Ethers by a Diphosphine and Hydrido-Bridged Diiridium Complex

Inorganics, 2019
The reaction of [(Cp*Ir)2(μ-dmpm)(μ-H)][OTf] (2) [Cp* = η5-C5Me5, dmpm = bis(dimethylphosphino)methane] with 2,3-dihydrofuran gives [(Cp*IrH)2(μ-dmpm){μ-(2,3-dihydrofuranyl)}][OTf] (3) in an isolated yield of 70% via the C− ...
Yoshinori Takahashi, Takuya Shimbayashi, Ken-ichi Fujita   +2 more
doaj   +1 more source

Zinc-indium-sulfide favors efficient C − H bond activation by concerted proton-coupled electron transfer

Nature Communications
C − H bond activation is a ubiquitous reaction that remains a major challenge in chemistry. Although semiconductor-based photocatalysis is promising, the C − H bond activation mechanism remains elusive.
Xuejiao Wu, Xueting Fan, Shunji Xie, Ivan Scodeller, Xiaojian Wen, Dario Vangestel, Jun Cheng, Bert Sels   +7 more
doaj   +1 more source

Recent advances in electrochemical C–N bond formation via C–H/N–H activation with hydrogen evolution

Current Research in Green and Sustainable Chemistry
Electroorganic synthesis is a powerful sustainable tool for achieving greener and more efficient chemical processes across various industries. By adhering to the principles of green chemistry, atom economy, and resource efficiency, electroorganic ...
Subban Kathiravan, Ian A. Nicholls
doaj   +1 more source

Photosensitized direct C–H fluorination and trifluoromethylation in organic synthesis

Beilstein Journal of Organic Chemistry, 2020
The importance of fluorinated products in pharmaceutical and medicinal chemistry has necessitated the development of synthetic fluorination methods, of which direct C–H fluorination is among the most powerful.
Shahboz Yakubov, Joshua P. Barham
doaj   +1 more source

C(sp3)–H trifluoromethylation of pyrrolidine by [W10O32]4−/copper synergetic photocatalysis: Theoretical investigation of reactivity and regioselectivity

Polyoxometalates
Polyoxometalates (POMs) are known for their well-established catalytic properties, particularly in photocatalysis, and have made significant strides in achieving selective C(sp3)−H functionalization.
Yu-Jiao Dong, Zhong-Min Su, Wei Guan
doaj   +1 more source

Electron Density and Molecular Orbital Analyses of the Nature of Bonding in the η³-CCH Agostic Rhodium Complexes Preceding the C–C and C–H Bond Cleavages

Molecules
In our recent work, we revisited C–H and C–C bond activation in rhodium (I) complexes of pincer ligands PCP, PCN, PCO, POCOP, and SCS. Our findings indicated that an η3-Csp2Csp3H agostic intermediate acts as a common precursor to both C–C and C–H bond ...
Irena Efremenko
doaj   +1 more source

Arylic C–X Bond Activation by Palladium Catalysts: Activation Strain Analyses of Reactivity Trends

Scientific Reports, 2018
We have quantum chemically explored arylic carbon–substituent bond activation via oxidative insertion of a palladium catalyst in C6H5X + PdLn model systems (X = H, Cl, CH3; Ln = no ligand, PH3, (PH3)2, PH2C2H4PH2) using relativistic density functional ...
Pascal Vermeeren, Xiaobo Sun, F. Matthias Bickelhaupt   +2 more
doaj   +1 more source

Synthesis and Photocatalytic sp³ C-H Bond Functionalization of Salen-Ligand-Supported Uranyl(VI) Complexes

Molecules
Recent years have seen increasing interest in uranyl(VI) photocatalysis. In this study, uranyl complexes were successfully synthesized from ligands L1–L6 and UO2(NO3)2·6H2O under reflux conditions, yielding products 1–6 with yields ranging from 30% to 50%
Jialu He, Xingxing Gong, Yafei Li, Qianyi Zhao, Congqing Zhu   +4 more
doaj   +1 more source