Results 31 to 40 of about 35,146,565 (216)

Selective Activation of Methane C-H Bond in the Presence of Methanol [PDF]

open access: yes, 2019
Direct methane to methanol (MTM) conversion over heterogeneous catalysts is a promising route for valorization of methane. The methane C-H bond activation is considered as the key step of the MTM and is the focus of considerable research activity ...
Yongjie Xi (8064173)   +3 more
core   +1 more source

Transition Metal-catalyzed C-H /C-C Activation and Coupling with 1, 3-diyne [PDF]

open access: yes, 2022
This review focuses on providing a broad overview of the recent developments in the field of transition metal-catalyzed C-H bond activation and coupling with 1,3-diyne for assembling alkynylated heterocycles and bis-heterocycles.
Tanmayee, Nanda   +4 more
core   +1 more source

Regioselective Pd-catalyzed direct C1- and C2-arylations of lilolidine for the access to 5,6-dihydropyrrolo[3,2,1-ij]quinoline derivatives

open access: yesBeilstein Journal of Organic Chemistry, 2019
The Pd-catalyzed C–H bond functionalization of lilolidine was investigated. The use of a palladium-diphosphine catalyst associated to acetate bases in DMA was found to promote the regioselective arylation at α-position of the nitrogen atom of lilolidine ...
Hai-Yun Huang   +4 more
doaj   +1 more source

Co(III) Intermediates in Cobalt-Catalyzed, Bidentate Chelation Assisted C(sp2)-H Functionalizations

open access: yesInorganics, 2023
The C-H bond activation and functionalization is a powerful tool that provides efficient access to various organic molecules. The cobalt-catalyzed oxidative C-H bond activation and functionalization has earned enormous interest over the past two decades.
Aleksandrs Cizikovs, Liene Grigorjeva
doaj   +1 more source

C−H Bond Activation by Iridium(III) and Iridium(IV) Oxo Complexes [PDF]

open access: yes, 2023
Oxidation of an iridium(III) oxo precursor enabled the structural, spectroscopic, and quantum-chemical characterization of the first well-defined iridium(IV) oxo complex.
Verplancke, H.   +15 more
core   +1 more source

Recent Advances in the Synthesis of Cyclic Sulfoximines via C–H Bond Activation

open access: yesMolecules, 2023
Sulfoximines, a ubiquitous class of structural motifs, are widely present in bioactive molecules and functional materials that have received considerable attention from modern organic chemistry, pharmaceutical industries, and materials science ...
Bingren Wang, Xiayu Liang, Qingle Zeng
doaj   +1 more source

C2-Alkylation of N-pyrimidylindole with vinylsilane via cobalt-catalyzed C–H bond activation

open access: yesBeilstein Journal of Organic Chemistry, 2012
Direct C2-alkylation of an indole bearing a readily removable N-pyrimidyl group with a vinylsilane was achieved by using a cobalt catalyst generated in situ from CoBr2, bathocuproine, and cyclohexylmagnesium bromide.
Zhenhua Ding, Naohiko Yoshikai
doaj   +1 more source

Direct Light Activation of Hypervalent Iodine Reagents: Substrate-Controlled C-C or C-H Alkynylation of Cyclopropanes [PDF]

open access: yes, 2022
We report the direct light activation of ethynylbenziodoxolone (EBX) reagents for the oxyalkynylation of aryl- and amino-cyclopropanes as well as styrenes. Irradiation with visible light at 440 nm promoted the reaction without the need of a photocatalyst.
Tin. V. T. , Nguyen, Jerome, Waser
core   +1 more source

Understanding trends in C–H bond activation in heterogeneous catalysis [PDF]

open access: yes, 2018
A universal descriptor for the prediction of C–H bond activation barriers has been established, and combined with a thermodynamic analysis of methane activation, to provide design rules for various types of heterogeneous ...
Yoo, Jong Suk   +8 more
core   +1 more source

Mechanistic Study of Ru-NHC-Catalyzed Hydrodefluorination of Fluoropyridines: The Influence of the NHC on the Regioselectivity of C–F Activation and Chemoselectivity of C–F versus C–H Bond Cleavage [PDF]

open access: yes, 2015
We describe a combined experimental and computational study into the scope, regioselectivity, and mechanism of the catalytic hydrodefluorination (HDF) of fluoropyridines, C5F5–xHxN (x = 0–2), at two Ru(NHC)(PPh3)2(CO)H2 catalysts (NHC = IPr, 1, and IMes,
Whittlesey, Michael K.   +19 more
core   +1 more source

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