Results 121 to 130 of about 29,422 (294)

Studies on the pro-oxidant chemistry of flavonoids

, 2002
There is currently much interest in the development of functional foods aiming at the prevention of the development of some diseases, for example cancer, by the introduction of selected natural substances at elevated levels into the diet.
Awad, H.M.
core  

Asymmetric α‐Alkylation With Activated and Unactivated Electrophiles by a Highly Productive and Recyclable Lewis Acid/Imidazolium Catalyst

Angewandte Chemie International Edition, EarlyView.
An air‐stable, easily prepared, bifunctional Cu(II)/imidazolium complex enables highly enantioselective α‐alkylation of 1,3‐dicarbonyls with outstanding productivity (TON up to 1740). Highlights include broad electrophile scope spanning π‐activated and nonactivated reagents, stereo‐retentive allylation, simple catalyst synthesis, and efficient catalyst
Johanna Haußmann, Alexander Beck, Dominik Hornung, Michael Mistele, Alexander Allgaier, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +8 more
wiley   +1 more source

Regioselectivity of the Claisen rearrangement of meta- and para-substituted allyl aryl ethers

The regioselectivity of the Claisen rearrangement with different meta-substituted and meta- and para-substituted allyl phenyl ethers was investigated.
William Thomas, Möller, Svava Dögg, Hreinsdóttir, Benjamín Ragnar, Sveinbjörnsson, Luis Antonio, Arana   +3 more
core   +1 more source

Hydrogen Isotope Exchange in Pyridine Catalyzed by an Iron(II) Imido Complex: Counterion-Directed Regioselectivity. [PDF]

Angew Chem Int Ed Engl
Anionic high‐spin iron(II) imido complexes are catalysts for the hydrogen isotope exchange (HIE) reaction with pyridine as the substrate. The alkali metal counter‐cation plays critical roles in activating the substrate and facilitating deuteration. These complexes catalyze site‐selective α‐, α,β,γ‐, and β,γ‐deuteration of pyridine, where the counter ...
Feng B, Li G, Gao Y, Yamamoto N, Pink M, Peng Q, Smith JM.   +6 more
europepmc   +3 more sources

Aziridination of a Single Carbon Atom in Alkenes via Energy Transfer Catalysis

Angewandte Chemie International Edition, EarlyView.
Contrary to traditional alkene aziridination via (formal) nitrene transfer, we herein report a strategy that achieves intermolecular aziridination of a single alkene carbon atom and installs an additional group at the other. Enabled by metal‐free energy transfer (EnT) catalysis, alkenyl boronates and silanes are transformed into reactive intermediates ...
Fritz Paulus, Corinna Heusel, Felix H. Wessels, Bünyamin Sikora, Maik G. Niedziella, Kilian van der Beck, Constantin G. Daniliuc, Frank Glorius   +7 more
wiley   +1 more source

Elucidating the Interplay Between Structure and Electrochemical Behavior in Lignin‐Based Polymer Electrolytes for Potassium Batteries

Battery Energy, Volume 4, Issue 2, March 2025.
Three biobased membranes are synthesized by crosslinking oxidized Kraft lignin with poly(ethylene glycol) diglycidyl ether of increasing molecular weights. After incorporation of solvated potassium salts, potassium batteries including these biobased gel polymer electrolytes are able to deliver a maximum specific capacity at 0.05 A g−1 as high as 130 ...
Giuseppe Pascuzzi, Sabrina Trano, Carlotta Francia, Stefano Turri, Federico Bella, Gianmarco Griffini   +5 more
wiley   +1 more source

Grafting Nanolayers of Ni and Co Catalysts Around the Edges of Hierarchical Zeolite 13X by Leveraging the Crystal's Defects for CO2 Methanation

Carbon Energy, EarlyView.
The deactivation of nickel‐based catalysts at high temperatures poses a significant challenge in CO2 methanation processes. To address this, a strong metal–support interaction between nickel and the support was engineered by exploiting the crystal defects present in hierarchical porous zeolite 13X.
Nasir Shezad, Muddasar Safdar, Shaojiang Chen, Cheuk‐Wai Tai, Harvey Arellano‐García, Dong‐Kyun Seo, Peizhong Feng, Farid Akhtar   +7 more
wiley   +1 more source

Mechanism and Origin of Regioselectivity in the Phosphine-Catalyzed Heine Reaction

Powered@NLHPC: This research was partially supported by the supercomputing infrastructure of the NLHPC (CCSS210001) and the HPC-OCÉANO (FONDEQUIP N°EQM170214). S. G.-F.
Lodeiro, Lucas, Fernández, Israel, Fernández López, Israel, Gallardo-Fuentes, Sebastián, Gallardo Fuertes, Sebastian   +4 more
core   +1 more source

Regioselectivity in the Palladium-Catalyzed Addition of Carbon Nucleophiles to Carbocyclic Derivatives^‡

, 2016
The regioselectivity of Pd-catalyzed malonate additions and arylations to cycloalkenyl esters can be predicted by completing a stereochemical analysis of the Pd−π-allyl complex.
Michael T. Crimmins (1317639), Bryan W. King (2177804), Marc-Raleigh Brescia (3028677), Molly E. Hoke (2403955), Philip DeShong (2379178), Suzanne Bogaczyk (3028683)   +5 more
core   +1 more source

Pd(II)‐Catalyzed Strategies for the β‐Arylation of α‐Amino Acids: An Overview

Chemistry – A European Journal, EarlyView.
The graphical abstract summarizes the review “Pd(II)‐Catalyzed Strategies for the β‐Arylation of α‐Amino Acids: An Overview”, highlighting representative Pd(II)‐catalyzed methods for the β‐arylation of α‐amino acids. Key mechanistic features, substrate diversity, and synthetic relevance of these transformations are showcased. Abstract Metal‐catalyzed C─
Davide Illuminati, Claudio Trapella, Vinicio Zanirato, Virginia Cristofori, Anna Fantinati   +4 more
wiley   +1 more source