Results 21 to 30 of about 29,149,024 (329)

Rollover Cyclometalation as a Valuable Tool for Regioselective C–H Bond Activation and Functionalization

open access: yesMolecules, 2021
Rollover cyclometalation constitutes a particular case of cyclometallation reaction. This reaction occurs when a chelated heterocyclic ligand loses its bidentate coordination mode and undergoes an internal rotation, after which a remote C–H bond is ...
Antonio Zucca, Maria I. Pilo
doaj   +1 more source

Steric, Electronic and Conformational Synergistic Effects in the Au(I)-catalyzed alpha-C-H Bond Functionalization of Tertiary Amines [PDF]

open access: yes, 2022
Direct C-H bond functionalization is a useful strategy for the straightforward formation of C-C and C-Heteroatom bonds. In the present work, a unique approach for the challenging electrophilic Au-catalyzed alpha-C-H bond functionalization of tertiary ...
David F. , León Rayo   +4 more
core   +3 more sources

Direct functionalization of C−H bonds by electrophilic anions [PDF]

open access: yesProceedings of the National Academy of Sciences, 2020
Significance Functionalization of unreactive molecules is a significant chemical challenge relevant to the conversion of abundant feedstocks such as alkanes into high-value chemicals. Herein, we demonstrate a new mechanism of alkane functionalization by the substitution of a proton by an anion in an alkyl chain.
Jonas Warneke   +14 more
openaire   +3 more sources

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

Ligand control of hydrocarbon C-H bond functionalization by uranyl photocatalysts [PDF]

open access: yes, 2023
The aqueous uranyl dication has long been known to facilitate the UV light-induced decomposition of aqueous VOCs (volatile organic compounds), via the long-lived highly efficient, uranyl excited state.
Polly, Arnold   +8 more
core   +1 more source

Novel Strategies in C-H Oxidations for Natural Product Diversification—A Remote Functionalization Application Summary

open access: yesFrontiers in Chemistry, 2021
Selectively activating the distal inactive C-H bond for functionalization is one of the on-going challenge in organic synthetic chemistry. In recent years, benefiting from the development of selective synthesis methods, novel methodologies not only make ...
Huang Junrong   +11 more
doaj   +1 more source

Highly Site-Selective Direct C−H Bond Functionalization of Unactivated Arenes with Propargyl α‑Aryl-α-diazoacetates via Scandium Catalysis [PDF]

open access: yes, 2021
Highly chemo- and regio-selective C–H bond functionalization of unactivated arenes with propargyl α-aryl-α-diazoacetates is developed using scandium catalysis.
Kumar, Vanka   +4 more
core   +2 more sources

Transition Metal-Catalyzed Remote C–H Bond Functionalization of Cyclic Amines

open access: yesSynOpen, 2022
C–H bond functionalization is one of the most effective strategies for the rapid synthesis of cyclic amines containing substituents in the ring, which are core structures of many bioactive molecules. It is, however, much more challenging to perform this
Weijie Chen, Xiaoyu Yang, Xi Cao
doaj   +1 more source

Tuning Benzylic C−H Functionalization of (Thio)xanthenes with Electrochemistry

open access: yesMolecules, 2023
Here, we report a tunable electrochemical benzylic C−H functionalization of (thio)xanthenes with terminal alkynes and nitriles in the absence of any catalyst or external chemical oxidant.
Changji Wang   +4 more
doaj   +1 more source

Strategies to transform remote C(sp3)-H bonds of amino acid derivatives

open access: yesTetrahedron Chem, 2022
Amino acids and peptides play an important role in nature as well as in the pharmaceutical industry. Therefore, transformation of amino acids and peptides into their unnatural derivatives via step and atom economical ways is highly demanding. Although, a
Supreeta Sen   +2 more
doaj   +1 more source

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