Results 101 to 110 of about 8,786 (262)

A Gallium(I) β‐Amido‐Imino‐Phosphorane: A Five‐Membered N‐Heterocyclic Gallylene with Enhanced Nucleophilicity

ChemistryEurope
Carbene analogs, especially of the group 13 elements, are interesting synthetic targets as they offer electronic characteristics that differ significantly from N‐heterocyclic carbenes (NHCs).
Aylin Nagel, Samuel R. Lawrence, Tobias Rüffer, Robert Kretschmer   +3 more
doaj   +1 more source

Backbone tuning in indenylidene–ruthenium complexes bearing an unsaturated N-heterocyclic carbene

Beilstein Journal of Organic Chemistry, 2010
The steric and electronic influence of backbone substitution in IMes-based (IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene) N-heterocyclic carbenes (NHC) was probed by synthesizing the [RhCl(CO)2(NHC)] series of complexes to quantify ...
César A. Urbina-Blanco, Xavier Bantreil, Hervé Clavier, Alexandra M. Z. Slawin, Steven P. Nolan   +4 more
doaj   +1 more source

N-Heterocyclic Carbene Coinage Metal Complexes Containing Naphthalimide Chromophore: Design, Structure, and Photophysical Properties

Inorganics, 2017
A series of novel N-heterocyclic carbene coinage metal complexes containing a naphthalimide (NI) chromophore has been prepared and fully characterized. Two types of molecules are described those where the NI unit is directly attached to the carbene unit ...
Pierre-Henri Lanoë, Btissam Najjari, Florine Hallez, Geoffrey Gontard, Hani Amouri   +4 more
doaj   +1 more source

Flipping the Card With Enantiodivergent Organocatalysis

Chemistry – A European Journal, EarlyView.
This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre, Alessio Carioscia, Alessandro Brusa, Armando Carlone   +3 more
wiley   +1 more source

Novel expanded ring N-heterocyclic carbenes: free carbenes, silver complexes, and structures [PDF]

, 2008
The addition of aromatic formamidines to dihaloalkanes proceeds in air under mildly basic conditions and in polar solvents to afford the corresponding amidinium salts in high yields. To demonstrate the wide scope of this methodology, several five-, six-,
Beetstra, Dirk J, Knight, James C, Dervisi, Athanasia, Coles, Simon J., Iglesias, Manuel, Cavell, K J, Fallis, Ian Andrew, Coles, Simon, Fallis, I A, Ooi, Liling, Hursthouse, Michael B., Ooi, L, Stasch, Andreas, Male, Louise, Iglesias, Manuel Alonso, Knight, James Christopher, Hursthouse, Michael B, Cavell, Kingsley John, Beetstra, Dirk Johannes   +18 more
core   +1 more source

N‐Heterocyclic Carbene Analogues of Wittig Hydrocarbon

Chemistry – A European Journal
AbstractN‐Heterocyclic carbene (NHC) analogues of Wittig hydrocarbon, [(NHC)(Stil)(NHC)] (3a‐c) (NHC = SIPr (1a) = C[N(Dipp)CH2]2, Dipp = 2,6‐iPr2C6H3; IPr (1b) = C[N(Dipp)CH]2; Me‐IPr (1c) = C[N(Dipp)CMe]2 and Stil = C6H4CHCHC6H4) have been reported as crystalline solids.
Henric Steffenfauseweh, Yury V. Vishnevskiy, Beate Neumann, Hans‐Georg Stammler, Bas de Bruin, Rajendra S. Ghadwal   +5 more
openaire   +4 more sources

Photosensitizing Au(I) Catalysis With Coumarins

Chemistry – A European Journal, EarlyView.
A Au(I) complex with a tethered coumarin fragment was synthesized and characterized by UV‐vis and emission spectroscopy. Its ability to facilitate photo‐driven cross‐coupling reactions through single‐electron and energy transfer events was evaluated. ABSTRACT Gold catalysis shows versatility in a wide range of challenging transformations, wherein light‐
Liliana Capulín Flores, Jacob J. van der Wal, Johannes E. M. N. Klein   +2 more
wiley   +1 more source

Synthesis of Chiral Bifunctional (Thio)Urea N-Heterocyclic Carbenes [PDF]

The rapid and modular synthesis of the first bifunctional N-heterocyclic carbenes bearing a (thio)urea moiety as H-bond donor group was reported. Different analogues could be accessed in seven steps from cheap (S)-pyroglutamic acid in good overall yields
Osuna-Siles, José Ignacio, Waser, Jérôme, Brand, Jonathan P.   +2 more
core   +1 more source

Organocatalytic Formal (3+2+1)‐Cycloaddition of Allenoates, Michael Acceptors, and Carbaldehydes

Chemistry – A European Journal, EarlyView.
The use of secondary amine Lewis base organocatalysts allows for the unprecedented activation of allenoates for formal (3+2+1)‐cycloadditions with Michael acceptors and aromatic carbaldehydes. ABSTRACT Employing secondary amines as covalently interacting Lewis basic organocatalysts allows for the activation of electron‐deficient allenes (allenoates ...
David Naderer, Alexander Pötscher, Katharina Eder, Uwe Monkowius, Markus Himmelsbach, Mario Waser   +5 more
wiley   +1 more source

Copper-NHC complexes in catalysis [PDF]

, 2015
The authors gratefully acknowledge the Royal Society (University Research Fellowship to C.S.J.C.) for funding.Although the chemistry of copper has a long history [1a-d], the relatively recent discovery of N-heterocyclic carbene (NHC) as transition-metal ...
Cazin, Catherine, Nahra, Fady, Cazin, Catherine S.J., Lazreg, Faima   +3 more
core   +1 more source