Results 61 to 70 of about 9,318 (208)

1,4‐Pentanediol as an Alternative Biomass‐Derived Medium for the Phosphine‐Free Heck Coupling Reactions

ChemSusChem, Volume 19, Issue 9, 14 May 2026.
In this research, a phosphine‐free Heck coupling reaction was performed using biomass‐derived 1,4‐pentanediol and a polar protic solvent. It was demonstrated that a wide scope of products could be isolated by a simple filtration, eliminating the high‐solvent‐consuming column chromatography and reducing the E‐factor by more than 90% compared to ...
Csaba Árvai, László T. Mika
wiley   +1 more source

Mechanistic Study of Gold(I)-Catalyzed Intermolecular Hydroamination of Allenes [PDF]

, 2010
The intermolecular hydroamination of allenes occurs readily with hydrazide nucleophiles, in the presence of 3-12% Ph_3PAuNTf_2. Mechanistic studies have been conducted to establish the resting state of the gold catalyst, the kinetic order of the reaction,
Benitez, Diego, Goddard, William A., III, Tkatchouk, Ekaterina, Toste, F. Dean, Wang, Jane Z.   +4 more
core   +1 more source

Catalytic Enantioselective Synthesis of Conformationally Stable C(sp2)−C(sp3) Naphthocoumarin Atropisomers

Advanced Synthesis &Catalysis, Volume 368, Issue 9, 5 May 2026.
The enantioselective synthesis of naphthocoumarin adducts via a tandem organocatalytic 1,4‐addition/decarboxylation delivers excellent control over a newly forged stereocenter and yields configurationally stable synclinal atropisomers. The process features broad substrate scope and scalability, and its structural and mechanistic foundations are ...
M. Chiara Cabua, Davide Moi, Emanuele Cocco, Valentina Onnis, Enrico Podda, David J. Aitken, Armando Carlone, Renzo Luisi, Enrica Tuveri, Drew F. Parsons, Francesco Secci   +10 more
wiley   +1 more source

Hammett Correlations of Carbonyl 13C Chemical Shifts in a Series of N-(4-Substituted Phenyl)-6-Chloro-5-Fluoronicotinamides [PDF]

, 1995
A series of nine N-(4-substituted phenyl)-6-chloro-5- fluoronicotinamides exhibited excellent correlations of their carbonyl 13C shifts (5CO,ppm as measured in DMSO) with the standard Hammett substituent constants (c?R) of the substituent inthe 4 ...
Hawley, John W., Setliff, Frank L., Toland, Alan D.   +2 more
core   +1 more source

Cyrene Dimethyl Acetal: Potential Alternative Solvent for Pd‐Catalyzed Homogeneous Aminocarbonylation of Iodo(hetero)arene Compounds

ChemPlusChem, Volume 91, Issue 5, May 2026.
Insert text for Table of Contents here. In this research, the synthesis of new Cyrene derivatives (Cyrene dimethyl acetal and Cyrene diethyl acetal) was accomplished, and the investigation of their physicochemical properties was completed. It was also shown after a detailed optimization study that Cyrene dimethyl acetal could be an appropriate ...
Attila Takács, Nuray Uzunlu Ince, Zoltán Medgyesi, Huda Hamed, László Kollár, Bence Mihalovics, László T. Mika   +6 more
wiley   +1 more source

From the Modeling of Experiments to the Ab Initio Prediction of Rate Constants: Statistical Rate Theory for a Quantitative Understanding of Gas‐Phase Ion Chemistry

ChemPhysChem, Volume 27, Issue 8, 28 April 2026.
For directly comparing experimental results on gas‐phase ion reactions with the predictions from quantum chemical calculations, the latter must first be converted into rate constants. This review addresses the question of whether current methods of statistical rate theory can accomplish this task reliably. Statistical rate theory has long been used for
Thomas Auth, Konrad Koszinowski
wiley   +1 more source

Pd‐Catalyzed C─C Bond Borylation of Biphenylenes Leading to Tri‐Ortho‐Substituted Biaryls

Chemistry – A European Journal, Volume 32, Issue 16, 25 April 2026.
Palladium‐catalyzed ring‐opening C─C borylation of 1‐substituted biphenylenes yields a range of o,o,o′‐trisubstituted biaryls with two ortho‐boryl groups via selective cleavage of the least hindered C─C bond. The resulting diborylated products are readily amenable to sequential, site‐selective postfunctionalization.
Robyn V. Presland, Konstantin V. Luzyanin, Luke A. Wilkinson, Oliver L. Jacobs, Nathan R. Halcovitch, Alexey G. Sergeev   +5 more
wiley   +1 more source

Introduction of the Difluoro(methoxy)methyl Group into the Aromatic Ring and the Study of Its Electronic Properties

Журнал органічної та фармацевтичної хімії
A simple and efficient method for synthesizing aromatic compounds with a difluoro(methoxy)methyl fragment (CF2OCH3) by the fluorodesulfurization of thionoesters has been developed.
Mykhailo O. Pashko, Yurii L. Yagupolskii
doaj   +1 more source

DFT Study on the Oxidative Addition of 4-Substituted Iodobenzenes on Pd(0)-Phosphine Complexes [PDF]

, 2015
The oxidative additon of 4-substituted iodobenzenes on Pd(0)-PMe3 complexes has been studied at the BP86 level of theory including dispersion correction and solvation effect, with tetrahydrofuran as solvent.
Kollár, László, Kégl, Tamás, Kégl, Tímea   +2 more
core   +2 more sources

Heteroaryl‐Substituted Polyfluorobiaryls Synthesis via Palladium‐Catalyzed Double C─H Bond Functionalization Using Palladium 1,4‐Migration Associated to Direct Arylation

European Journal of Organic Chemistry, Volume 29, Issue 13, 13 April 2026.
Fluoro substituents on a benzene ring linked to a 2‐bromoaryl group enables the selective activation of one of its C─H bonds via Pd‐1,4‐migration. Then, Pd‐catalyzed direct coupling with heteroarenes produces C2’‐heteroarylated 1,1′‐biaryls. In this reaction, the new C–C bond arises from the functionalization of two C─H bonds.
Norman Le Floch, Thierry Roisnel, Henri Doucet   +2 more
wiley   +1 more source