Carbene Complexes of Rhodium and Iridium from Tripodal N-Heterocyclic Carbene Ligands:  Synthesis and Catalytic Properties

2004 ◽  
Vol 43 (6) ◽  
pp. 2213-2219 ◽  
Author(s):  
Elena Mas-Marzá ◽  
Macarena Poyatos ◽  
Mercedes Sanaú ◽  
Eduardo Peris
Keyword(s):  
Catalytic Properties ◽  
Carbene Ligands ◽  
Carbene Complexes

scholarly journals Bi- and trinuclear copper(I) complexes of 1,2,3-triazole-tethered NHC ligands: synthesis, structure, and catalytic properties

2016 ◽  
Vol 12 ◽  
pp. 863-873 ◽  
Author(s):  
Shaojin Gu ◽  
Jiehao Du ◽  
Jingjing Huang ◽  
Huan Xia ◽  
Ling Yang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Copper Complexes ◽  
Catalytic Properties ◽  
Polynuclear Complexes ◽  
Carbene Ligands ◽  
Efficient Catalyst ◽  
X Ray ◽  
X Ray Crystallography ◽  
Air Atmosphere ◽  
Highly Active

A series of copper complexes (3–6) stabilized by 1,2,3-triazole-tethered N-heterocyclic carbene ligands have been prepared via simple reaction of imidazolium salts with copper powder in good yields. The structures of bi- and trinuclear copper complexes were fully characterized by NMR, elemental analysis (EA), and X-ray crystallography. In particular, [Cu2(L2)2](PF6)2 (3) and [Cu2(L3)2](PF6)2 (4) were dinuclear copper complexes. Complexes [Cu3(L4)2](PF6)3 (5) and [Cu3(L5)2](PF6)3 (6) consist of a triangular Cu3 core. These structures vary depending on the imidazolium backbone and N substituents. The copper–NHC complexes tested are highly active for the Cu-catalyzed azide–alkyne cycloaddition (CuAAC) reaction in an air atmosphere at room temperature in a CH3CN solution. Complex 4 is the most efficient catalyst among these polynuclear complexes in an air atmosphere at room temperature.

Carbene Adducts of Dimethylcadmium

1999 ◽  
Vol 54 (11) ◽  
pp. 1350-1356 ◽  
Author(s):  
Anthony J. Arduengo ◽  
Jens R. Goerlicha ◽  
Fredric Davidson ◽  
William J. Marshall
Keyword(s):  
Nmr Spectroscopy ◽  
Bond Distance ◽  
Imidazole Ring ◽  
Methyl Groups ◽  
Carbene Ligands ◽  
Cadmium Complexes ◽  
Carbene Complexes ◽  
X Ray ◽  
Planar Geometries

The first examples of carbene-cadmium complexes are reported from the reactions of a variety of imidazol-2-ylidenes or imidazolin-2-ylidenes with dimethylcadmium. Four new carbene complexes are characterized by NMR spectroscopy (1H , 13C and 113Cd). The cadmium centers are strongly shifted downfield (100 -150 ppm) by interaction with the carbenes. X-ray structures are reported for three carbene-cadmium 1:1 adducts. The cadmium centers exhibit distorted trigonal-planar geometries in which the carbene ligands have an average 18.2 pm longer bond distance to cadmium compared to the methyl groups. The planes of cadmium coordination are twisted with respect to the plane of the imidazole ring. The more basic imidazolin-2-ylidene is shown to displace imidazol-2-ylidenes from the cadmium center.

ChemInform Abstract: Alkylpalladium N-Heterocyclic Carbene Complexes: Synthesis, Reactivity, and Catalytic Properties.

ChemInform ◽  
2009 ◽  
Vol 40 (18) ◽  
Author(s):  
Oriana Esposito ◽  
Pedro M. P. Gois ◽  
Alexandra K. de K. Lewis ◽  
Stephen Caddick ◽  
F. Geoffrey N. Cloke ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Carbene Complexes

Functionalised Saturated-Backbone Carbene Ligands: Yttrium and Uranyl Alkoxy-Carbene Complexes and Bicyclic Carbene-Alcohol Adducts

2008 ◽  
Vol 14 (33) ◽  
pp. 10415-10422 ◽  
Author(s):  
Polly L. Arnold ◽  
Ian J. Casely ◽  
Zoë R. Turner ◽  
Christopher D. Carmichael
Keyword(s):  
Carbene Ligands ◽  
Carbene Complexes

The Synthesis of Novel Palladium(II) Carbene Complexes, Azolium Salts and Their Catalytic Properties

Heterocycles ◽  
2011 ◽  
Vol 83 (2) ◽  
pp. 299 ◽  
Author(s):  
Murat Yiğit ◽  
Beyhan Yiğit ◽  
İsmail Özdemir ◽  
Engin Çetinkaya
Keyword(s):  
Catalytic Properties ◽  
Carbene Complexes ◽  
Azolium Salts

scholarly journals Synthese, Molekül-und Elektronenstruktur eines Radikal-Kationkomplexes [Cr(CO)4(Carben)2]+ / Synthesis, Molecular and Electronic Structure of a Radical Cationic Complex [Cr(CO)4(Carbene)2]+

1983 ◽  
Vol 38 (11) ◽  
pp. 1313-1324 ◽  
Author(s):  
Klaus Ackermann ◽  
Peter Hofmann ◽  
Frank H. Köhler ◽  
Hans Kratzer ◽  
Herbert Krist ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Molecular Orbital Calculations ◽  
Cationic Complex ◽  
Carbene Ligands ◽  
Carbene Complexes ◽  
One Step ◽  
Chromium Compounds ◽  
First Time ◽  
Molecular And Electronic Structure ◽  
Cation Complexes

Abstract A new one-step synthesis for bis-carbene complexes cis-M(CO)4L2 (M = Cr, Mo, W) containing cyclic carbene ligands L has been developed. These compounds can be oxidized by ferrocenium salts to paramagnetic cation complexes [M(CO)4L2]+ which, for M = Cr, are isolable in the form of their PF6 salts. The chromium compounds with L= 1,3-dimethyl-4-imidazolin-2-ylidene permit for the first time a structural and spectroscopic comparison of a diamagnetic carbene complex with the corresponding paramagnetic cation; the experimental facts are interpreted by molecular orbital calculations.

New homoleptic gold carbene complexes via Ag–Au transmetalation: synthesis and application of [Au(diNHC)2]3+ cations as 1H-NMR and UV-vis halide sensors

2020 ◽  
Vol 44 (14) ◽  
pp. 5343-5353
Author(s):  
Marco Baron ◽  
Anna Dall’Anese ◽  
Alessandro Miolato ◽  
Maddalena L. C. Cairoli ◽  
Valerio Di Marco ◽  
...  
Keyword(s):  
1H Nmr ◽  
Carbene Ligands ◽  
Carbene Complexes ◽  
H Nmr ◽  
Anion Sensors

Novel homoleptic gold(iii) complexes with bidentate N-heterocyclic carbene ligands have been successfully synthesised by transmetalation reaction and studied as anion sensors in solution by means of 1H NMR and UV-vis titration experiments.

Cyclopentadienyl-ruthenium and -osmium chemistry. XII. Some complexes containing cyclic carbene ligands

1980 ◽  
Vol 33 (12) ◽  
pp. 2605 ◽  
Author(s):  
MI Bruce ◽  
AG Swincer ◽  
BJ Thompson ◽  
RC Wallis
Keyword(s):  
Intramolecular Cyclization ◽  
Carbene Ligands ◽  
Carbene Complexes ◽  
Group B

Reactions between ω-hydroxyalk-1-ynes, HC2(CH2)nOH (n = 2 or 3) or HC2CH2CHMeOH, and MX(PR3)2(η-C5H5) (M = Ru, X = Cl, R = Me or Ph; M = Os, X = Br, R = Ph) in the presence of NH4PF6 give cationic cyclic carbene complexes, presumably by rapid intramolecular cyclization of (undetected) intermediate ω-hydroxyvinylidene complexes. Further reactions of {Ru[C(CH2)3O]-(PPh3)2(η-C5H5)}+ include (a) base-catalysed H- D exchange of both H atoms of the β-CH2 group; (b) metallation and subsequent dimethylation of the β-CH2 group; (c) reduction by NaAlH2- (OCH2CH2OMe)2 to Ru[CH(CH2)3O](PPh3)2(η-C5H5).

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