Results 51 to 60 of about 36,419 (269)

The fluorine-NHC gauche effect: a structural and computational study [PDF]

, 2013
Herein, we report the synthesis and X-ray structural analysis of a collection of fluorinated metal N-heterocyclic carbenes (Ag, Au, Pd, Rh, Ir) and their precursor salts.
Gilmour, R., Paul, S., Rugg, G., Schweizer, W.B., Senn, H.M.   +4 more
core   +1 more source

Hydrogen Isotope Exchange in Pyridine Catalyzed by an Iron(II) Imido Complex: Counterion‐Directed Regioselectivity

Angewandte Chemie, EarlyView.
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 ...
Bin Feng, Guorong Li, Yafei Gao, Nobuyuki Yamamoto, Maren Pink, Qian Peng, Jeremy M. Smith   +6 more
wiley   +2 more sources

Dinuclear thiazolylidene copper complex as highly active catalyst for azid–alkyne cycloadditions

Beilstein Journal of Organic Chemistry, 2016
A dinuclear N-heterocyclic carbene (NHC) copper complex efficiently catalyzes azide–alkyne cycloaddition (CuAAC) “click” reactions. The ancillary ligand comprises two 4,5-dimethyl-1,3-thiazol-2-ylidene units and an ethylene linker.
Anne L. Schöffler, Ata Makarem, Frank Rominger, Bernd F. Straub   +3 more
doaj   +1 more source

N-heterocyclic carbene catalyzed synthesis of dimethyl carbonate via transesterification of ethylene carbonate with methanol

Journal of Saudi Chemical Society, 2015
An organocatalytic protocol for the synthesis of dimethyl carbonate has been developed. Under the catalysis of 5 mol% N-heterocyclic carbenes, ethylene carbonate undergoes transesterification reaction with methanol under very mild reaction conditions ...
Guang-Fen Du, Hao Guo, Ying Wang, Wen-Juan Li, Wei-Jie Shi, Bin Dai   +5 more
doaj   +1 more source

N‑heterocyclic carbene complexes provide a platform for functional amphidynamic crystals

Communications Chemistry, 2021
Organizing molecular rotors in highly ordered crystals enables the use of molecular motion to control physical properties. Now, N‑heterocyclic carbene complexes form a basis for molecular gyroscopes in which solid-state emission is quenched by axle ...
Victoria Richards
doaj   +1 more source

Syntheses of Sterically Shielded Stable Carbenes of the 1,2,4-Triazole Series and their Corresponding Palladium Complexes: Efficient Catalysts for Chloroarene Hydrodechlorination [PDF]

, 2014
The new sterically shielded 1,3,4-trisubstituted 1,2,4-triazol-5-ylidenes 8b-d were synthesized by a three step method starting from 2-phenyl-1,3,4-oxadiazole.
Butorac, Rachel R., Cowley, Alan H., Evans, Daniel A., Glinyanay, Nataliya V., Korotkikh, Nikolai I., Pekhtereva, Tatyana M., Popov, Anatolii F., Saberov, Vagiz S., Shvaika, Oles P.   +8 more
core   +1 more source

From [NHC─H]• to Persistent σ‐Complex Radicals: Photoinduced Radical Chemistry of Imidazolium Salts

Angewandte Chemie, EarlyView.
Visible‐light excitation of electron donor–acceptor (EDA) complexes between imidazolium salts and triarylamines enables controlled single‐electron transfer (SET) and reveals a family of carbene‐centered σ‐complex radical cations. Cryogenic electron paramagnetic resonance (EPR) captures the elusive [NHC─H]• intermediate and its thermal evolution into ...
Filipp M. Kolomeychuk, Lars J. C. van der Zee, Simon Mathew, Bas de Bruin, J. Chris Slootweg   +4 more
wiley   +2 more sources

Mechanochemical ligand-controlled regiodivergent hydroarylation of alkenes via iron-catalyzed C−H activation

Nature Communications
The iron-catalyzed hydroarylation of alkenes with indoles is a sustainable, effective synthetic transformation towards the construction of functionalized indoles - crucial motifs for various bioactive molecules and drug candidates.
Zi-Jing Zhang, Ziyue Liu, Xinran Chen, Lutz Ackermann   +3 more
doaj   +1 more source

Novel "green" catalysts for controlled ring-opening polymerization of lactide [PDF]

, 2010
Syntéza polylaktidu (PLA) polymerací za otevření kruhu cyklického monomeru (ROP) může být uskutečněna různými způsoby. Literatura uvádí více než 100 katalytických systémů, jejichž pomocí lze polylaktid a jiné biodegradabilní alifatické polyestery získat.
Surman, František
core  

A Ruthenium Olefin Metathesis Catalyst with a Four-Membered N-Heterocyclic Carbene Ligand [PDF]

, 2005
The first ruthenium olefin metathesis catalyst bearing a four-membered N-heterocyclic carbene (5) was synthesized and characterized by NMR spectroscopy and X-ray crystallography.
Despagnet-Ayoub, Emmanuelle, Grubbs, Robert H.   +1 more
core   +1 more source