Papers: Envíos recientes
Mostrando ítems 581-600 de 1293
A Practical Aryliodine(I/III) Catalysis for the Vicinal Diamination of Styrenes
2,6-Disubstituted iodoarenes bearing amide-functionalized side arms are reported as new structures in redox-active iodine(I/III) catalysis. In combination with bis-sulfonimides as nitrogen sources and 3-chloroperbenzoic ...
Shape-shifting molecules: unveiling the valence tautomerism phenomena in bare barbaralones
We report a state-of-the-art spectroscopic study of an archetypical barbaralone, conclusively revealing the valence tautomerism phenomena for this bistable molecular system. The two distinct 1- and 5-substituted valence ...
Role of σ,π-Digold(I) Alkyne Complexes in Reactions of Enynes
Gold(I) acetylide and ,-digold(I) alkyne digold(I) complexes derived from one prototypical 1,6-enyne and from 7-ethynyl-1,3,5-cycloheptatriene have been prepared and structurally characterized. Their possible role in ...
Synthesis of Bullvalenes: Classical Approaches and Recent Developments
The goal of this short review is to provide an overview of the different synthetic methodologies applied along the years for the synthesis of bullvalenes, prototypical fluxional molecules that were key in the understanding ...
Hydrogen-bonded dimeric capsules with appended spiropyran units: towards controlled cargo release
We report the synthesis of unprecedented tetra-urea derivatives of calix[4]arene and calix[4]pyrrole containing four spiropyran (SP) units at their upper rim. We investigate the photo- and acid-induced isomerization of the ...
Coinage Metal Complexes bearing Fluorinated N-Heterocyclic Carbene Ligands
The synthesis of novel fluorinated symmetrical and unsymmetrical imidazolium salts as well as their corresponding coinage metal complexes is described. The silver derivatives were prepared using Ag2O as the metal source ...
Tetrachlorophthalimides as Organocatalytic Acceptors for Electron Donor−Acceptor Complex Photoactivation
Excitation of photoactive electron donoracceptor (EDA) complexes is an effective way to generate radicals. Applications in a catalytic regime typically use catalytic donors. Herein, we report that readily available ...
Pd-Catalyzed Arylation of 1,2-Amino Alcohol Derivatives via -Carbon Elimination
Herein, we describe a Pd-catalyzed arylation of 1,2-amino alcohols with aryl halides enabled by a retroallylation manifold. This protocol constitutes a new entry point to -arylated aldehydes via the intermediacy of in ...
Dihydroquinazolinones as adaptative C(sp3) handles in arylations and alkylations via dual catalytic C–C bond-functionalization
C–C bond forming cross-couplings are convenient technologies for the construction of functional molecules. Consequently, there is continual interest in approaches that can render traditionally inert functionality as ...
Introduction: Photochemical Catalytic Processes
Chemists have been fascinated by visible light since the early days of organic synthesis. (1,2) After all, light offers the ideal form of (renewable) energy, making photochemistry intrinsically connected to sustainability. ...
Photochemical organocatalytic enantioselective radical γ-functionalization of α-branched enals
Reported herein is a rare example of asymmetric catalytic functionalisation of enals at the remote γ-position, proceeding via a radical path. The process requires visible light and exploits the synergistic actions of two ...
Photoredox Organocatalysis for the Enantioselective Synthesis of 1,7- Dicarbonyl Compounds
We describe an asymmetric organocatalytic method to synthesize 1,7-dicarbonyl compounds containing a β-stereocenter. The chemistry relies on the formation of γ-keto radicals, generated upon oxidative ring-opening ...
Catalytic alkene skeletal modification for the construction of fluorinated tertiary stereocenters
Herein we describe the first construction of fluorinated tertiary stereocenters based on an alkene C(sp2)–C(sp2) bond cleavage. The new process, that takes advantage of a Rh-catalyzed carbyne transfer, relies on a ...
A low temperature aqueous formate fuel cell using cobalt hexacyanoferrate as a non-noble metal oxidation catalyst
Cobalt hexacyanoferrate, the Co–Fe Prussian blue derivative (CoFePB), is an effective, selective and stable electrocatalyst for formate oxidation, exhibiting robust performance under a variety of electrolyte conditions. ...
The Road to Industrialization of Fine Chemical Carboxylation Reactions
The synthetic potential of carbon dioxide as an abundant and renewable C1 chemical feedstock has attracted considerable attention in the past decade with a particular focus on devising novel catalytic transformations to ...
New Generation Ligand Design for the Gold Catalyzed Asymmetric Activation of Alkynes
Striking gold! Several asymmetric gold(I)-catalyzed transformations have been discovered the last few years. Despite this major progress, the development of enantioselective reactions involving alkynes is still challenging. ...
Rhodium-catalysed ortho-alkynylation of nitroarenes
The ortho-alkynylation of nitro-(hetero)arenes takes place in the presence of a Rh(III) catalyst to deliver a wide variety of alkynylated nitroarenes regioselectively. These interesting products could be further derivatized ...
Planar Chiral 1,3-Disubstituted Ferrocenyl Phosphine Gold(I) Catalysts
Planar chiral monodentate 1,3-disubstituted ferrocene phosphines inspired on JohnPhos-type ligands have been synthesized and applied to the enantioselective gold(I) catalyzed [4 + 2] cycloaddition of 1,6-arylenynes. ...
H‑Bonded Counterion-Directed Enantioselective Au(I) Catalysis
A new strategy for enantioselective transition-metal catalysis is presented, wherein a H-bond donor placed on the ligand of a cationic complex allows precise positioning of the chiral counteranion responsible for asymmetric ...
Silver-Free Catalysis with Gold(I) Chloride Complexes
Gold(I) chloride complexes are stable, widespread precatalysts that generally require activation by halide abstraction to display useful catalytic activity. Chloride scavenging is typically performed in situ by using silver ...
