295338-50-0Relevant academic research and scientific papers
Mechanosynthesis of Noels-type NHC-Ruthenium Complexes and Applications in Ring-Opening Metathesis Polymerization
Bantreil, Xavier,Lamaty, Frédéric,Pinaud, Julien,Quintin, Fran?ois
supporting information, (2020/03/05)
The use of ball mills enabled the efficient mechanosynthesis of a variety of N-aryl,N-alkyl imidazolium salts and of corresponding NHC silver(I) complexes. Transmetalation with ruthenium via mechanochemistry allowed the rapid access (from 1.5 min to 1 h)
Half-sandwich ruthenium(ii) picolyl-nhc complexes: Synthesis, characterization, and catalytic activity in transfer hydrogenation reactions
Fernandez, Francys E.,Puerta, M. Carmen,Valerga, Pedro
scheme or table, p. 5793 - 5802 (2012/01/14)
Pentamethylcyclopentadienyl ruthenium(II) complexes with picolyl-functionalized N-heterocyclic carbenes [(η5-C 5Me5)-Ru(L)(CH3CN)][PF6] (L = 3-methyl-1-(2-picolyl)imidazol-2-ylidene (1a), 3-isopropyl-1-(2-picolyl) imidazol-2-ylidene (1b), 3-phenyl-1-(2-picolyl)imidazol-2-ylidene (1c), 3-mesityl-1-(2-picolyl)imidazol-2-ylidene (1d), 3-methyl-1-(2-picolyl) benzoimidazol-2-ylidene (1e), 3-methyl-1-(2-picolyl)-4,5-dichloroimidazol-2- ylidene (1f)) have been synthesized and characterized. Compounds 1a,b were recrystallized as BAr4 F salts (anion BAr4 F- = tetrakis(3,5-bis(trifluoromethyl)phenyl)borate), giving 2a,b. X-ray crystal structures of the acetonitrile adduct 2a and the dioxygen compound 2b are also reported. Furthermore, carbonyl derivatives 3a-f have been prepared, characterized, and used to study the donor properties of the picolylcarbene ligands(l) via infrared spectroscopy. Compounds 1a-f show catalytic activity in transfer hydrogenation of ketones. Notably, complex 1a was found to be a very efficient and versatile catalyst toward transfer hydrogenation of a wide range of ketones and imines.
Bulky picolyl substituted NHC ligands and their Pd0 complexes
Warsink, Stefan,Van Aubel, Carien M. S.,Weigand, Jan J.,Liu, Shiuh-Tzung,Elsevier, Cornelis J.
scheme or table, p. 5556 - 5562 (2011/04/23)
Heterobidentate N-heterocyclic carbene-picolyl ligands with various substitution patterns and their palladium(0) complexes have been synthesized in excellent yields via their corresponding silver(I) complexes. These complexes are among the first examples where substitution next to the coordinating nitrogen is evaluated systematically. The complexes have been studied by NMR and X-ray diffraction, confirming their bidentate nature. The complexes are active precatalysts in the transfer semihydrogenation of alkynes to Z-alkenes, with activity and selectivity depending on the picolyl substituent to a high degree. Selectivities as high as 92 % were observed. The use of differently substituted secondary picolyl donors on NHC ligands leads to stable palladium(0) complexes. The complexes are active precatalysts for the selective transfer semihydrogenation of alkynes to Z-alkenes. Copyright
Expeditious synthesis of N0-substituted N-mesitylimidazolium salts as NHC precursors
Truscott, Byron J.,Klein, Rosalyn,Kaye, Perry T.
experimental part, p. 5041 - 5043 (2011/01/04)
In contrast to time-consuming, conventional thermal approaches, microwave irradiation provides rapid and convenient access to unsymmetrical N0-substituted N-mesitylimidazolium salts, which are important precursors for NHC ligands used in the construction
N-Functionalised heterocyclic carbcne complexes of silver
Tulloch, Arran A. D.,Danopoulos, Andreas A.,Winston, Scott,Kleinhenz, Sven,Eastham, Graham
, p. 4499 - 4506 (2007/10/03)
W-Functionalised imidazol-2-ylidene carbene complexes of Ag1 have been prepared by interaction of the corresponding imidazolium salt with Ag2O in dichloromethane or 1,2-dichloroethane in the presence of molecular sieves or with Ag2CO3 in 1,2-dichloroethane. In an analogous way disilver(i) complexes of o-phenylenedimethylenebis(imidazol-2ylidene) have been obtained. Their structures, as determined by X-ray crystallography, indicate that the carbene ligand ' ' acts as monodentate from the carbene end or as a bridge between two different metal atoms. In one case the silver is coordinated by two carbene ligands. In the majority of the structurally characterised complexes the metal centres adopt linear geometries with M-C(carbene) bond lengths in the range of 207-210 pm characteristic of a single bond. The Royal Society of Chemistry 2000.
