Results 21 to 30 of about 36,419 (269)
A Stable Four-Membered N-Heterocyclic Carbene [PDF]
, 2004 The synthesis of the first four-membered N-heterocyclic carbene is described. Depending on the substituents on the nitrogen atoms, it is possible to characterize at room temperature the carbene dimer or the free carbene.
Despagnet-Ayoub, Emmanuelle +1 more
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Actinide tetra-N-heterocyclic carbene ‘sandwiches’ [PDF]
Chemical Science, 2021 Highly-symmetrical, thorium and uranium octakis-carbene ‘sandwich’ complexes have been prepared by ‘sandwiching’ the An(iv) cations between two anionic macrocyclic tetra-NHC ligands, one with sixteen atoms and the other with eighteen atoms.
Joseph F. DeJesus +6 more
openaire +4 more sources
CHIMIA, 2020 In this work, we provide a brief overview of the role of N-aryl substituents on triazolium N-heterocyclic carbene (NHC) catalysis. This synopsis provides context for the disclosed synthetic protocol for new chiral N-heterocyclic carbene (NHC) triazolium ...
Anas Abo Raed +3 more
doaj +1 more source
First direct evidence of N-heterocyclic carbene in BMIm acetate ionic liquid. An electrochemical and chemical study on the role of temperature [PDF]
, 2017 Cyclic voltammetry provides the first direct evidence of N-heterocyclic carbene (NHC) presence in neat 1-‐butyl-3-methylimidazolium acetate ionic liquid (BMImAcO) at 120°C. The NHC existence, proved by its oxidation current in cyclic voltammetry, was
Chiarotto, I., Feroci, M., Inesi, A.
core +1 more source
3,3′-Di-n-butyl-1,1′-(p-phenylenedimethylene)diimidazolium bis(hexafluorophosphate)
Acta Crystallographica Section E, 2010 The asymmetric unit of the title N-heterocyclic carbene compound, C22H32N42+·2PF6−, consists of one half of the N-heterocyclic carbene dication and one hexafluorophosphate anion.
Rosenani A. Haque +4 more
doaj +1 more source
Aryl radical-mediated N-heterocyclic carbene catalysis
Nature Communications, 2021 Use of aryl halides as coupling precursors typically occurs through transition metal catalysis and/or photoredox chemistry, which requires some combination of light, metals, and oxidants or reductants.
Yuki Matsuki +6 more
doaj +1 more source
Recent developments in the Suzuki-Miyaura reaction: 2010-2014 [PDF]
, 2015 The Suzuki-Miyaura reaction (SMR), involving the coupling of an organoboron reagent and an organic halide or pseudo-halide in the presence of a palladium or nickel catalyst and a base, has arguably become one of most utilized tools for the construction ...
Maluenda, Irene, Navarro, Oscar
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N‐Heterocyclic Carbene Organocatalysis: With or Without Carbenes?
Chemistry – A European Journal, 2020 AbstractIn this work the mechanism of the aldehyde umpolung reactions, catalyzed by azolium cations in the presence of bases, was studied through computational methods. Next to the mechanism established by Breslow in the 1950s that takes effect through the formation of a free carbene, we have suggested that these processes can follow a concerted ...
Sascha Gehrke, Oldamur Hollóczki
openaire +2 more sources
The Potential of N-Heterocyclic Carbene Complexes as Components for Electronically Active Materials
CHIMIA, 2010 The application of N-heterocyclic carbene complexes as active sites in materials other than catalysis has been remarkably scarce. Inspired by the – often misleading – 'carbene' label, which implies a substantial degree of M=C ?
Oliver Schuster +2 more
doaj +1 more source
Latent olefin metathesis catalysts [PDF]
, 2009 Olefin metathesis is a versatile synthetic tool for the redistribution of alkylidene fragments at carbon-carbon double bonds. This field, and more specifically the development of task-specific, latent catalysts, attracts emerging industrial and academic ...
Drozdzak, Renata +4 more
core +2 more sources