Results 81 to 90 of about 14,653 (264)

Direct Synthesis of N‐Heterocyclic Carbene‐Stabilized Copper Nanoparticles from an N‐Heterocyclic Carbene–Borane [PDF]

Chemistry – A European Journal, 2019
AbstractN‐Heterocyclic carbene (NHC)‐stabilized copper nanoparticles (NPs) were synthesized from an NHC–borane adduct and mesitylcopper(I) under thermal conditions (refluxing toluene for 2.5 h). NPs with a size distribution of 11.6±1.8 nm were obtained. The interaction between Cu NPs and NHC ligands was probed by X‐ray photoelectron spectroscopy, which
Frogneux, Xavier, Hippolyte, Laura, Mercier, Dimitri, Portehault, David, Chanéac, Corinne, Sanchez, Clément, Marcus, Philippe, Ribot, François, Fensterbank, Louis, Carenco, Sophie   +9 more
openaire   +3 more sources

Iron- and cobalt-catalyzed synthesis of carbene phosphinidenes [PDF]

, 2015
In the presence of stoichiometric or catalytic amounts of [M{N(SiMe3)2}2] (M=Fe, Co), N-heterocyclic carbenes (NHCs) react with primary phosphines to give a series of carbene phosphinidenes of the type (NHC)·PAr. The formation of (IMe4)·PMes (Mes=mesityl)
Adiraju, Aktaş, Alcazaro, Arduengo, Arduengo, Arduengo, Back, Back, Basuli, Basuli, Binder, Cowley, Day, Day, Doddi, Dorsey, Ellis, Evans, Frison, Frison, Graham, Ingleson, Kilgore, Lammertsma, Larocque, Layfield, Liu, Marinetti, Masuda, Pugh, Rodrigues, Rosa, Schneider, Schwedtmann, Tondreau, Wang, Wang, Waterman, Waterman, Waterman, Weber, Weber, Zhao   +42 more
core   +2 more sources

Non-classical N-Heterocyclic Carbene Complexes [PDF]

, 2010
The expansion of N-heterocyclic carbenes as ligands for transition metals to mesoionic ligand systems has led to the discovery of a wide range of non-classical carbene-type ligands. These non-classical carbene-type ligands are characterised by a significantly lower heteroatom stabilisation of the (putative) free carbene, a situation that also affects ...
Krüger, Anneke, Albrecht, Martin
openaire   +3 more sources

Theoretical rationalisation for the mechanism of N-heterocyclic carbene-halide reductive elimination at CuIII, AgIII and AuIII [PDF]

, 2016
Reductive elimination of imidazolium salts from CuIII is extremely sensitive to the anionic ligand (X or Y) type on Cu (e.g. ΔG‡ ranges from 4.7 kcal mol-1 to 31.8 kcal mol-1, from chloride to benzyl).
Ariafard, Alireza, Babaahmadi, Rasool, Fairlamb, Ian J S, Nasiri, Bahare, Willans, Charlotte E., Younesi, Yasamin   +5 more
core   +2 more sources

Isolation and Reactivity of a Square‐Planar Trisamido Silane

Angewandte Chemie International Edition, EarlyView.
We report the synthesis and comprehensive characterisation of a square‐planar Si(+IV) hydride supported by an unsymmetric, trianionic and dearomatised N,N,N‐pincer ligand. This system enables element–ligand cooperative reactivity as an alternative to silicon‐centred redox chemistry, illuminating a largely unexplored regime in high‐valent silicon ...
David M. J. Krengel, Xiaobai Wang, Christopher Golz, Regine Herbst‐Irmer, Oliver P. E. Townrow, Malte Fischer   +5 more
wiley   +1 more source

Synthesis and Structures of Fused N-Heterocylic Carbenes and Their Rhodium Complexes [PDF]

, 2010
New procedures for the synthesis of N-heterocyclic carbenes with multiple fused rings have been developed utilizing a key ring-closing metathesis step. Rhodium complexes were obtained via the pentafluorophenyl carbene adducts.
Grubbs, Robert H., Li, Jean, Stewart, Ian C.   +2 more
core   +2 more sources

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

A Facile Route to C2-Substituted Imidazolium Ionic Liquids

Molecules, 2009
A convenient route for the preparation of C2-substituted imidazolium ionic liquids is reported. This method involves the alkylation of N-heterocyclic carbenes, which are readily generated from the C2-unsubstituted imidazolium ionic liquids. It works well
Scott T. Handy, Elliot Ennis
doaj   +1 more source

Direct Functionalization of Nitrogen Heterocycles via Rh-Catalyzed C−H Bond Activation [PDF]

, 2008
Nitrogen heterocycles are present in many compounds of enormous practical importance, ranging from pharmaceutical agents and biological probes to electroactive materials.
Alberico D., Alonso F., Alvarez E., Bellina F., Bercaw J. E., Bergman R. G., Campeau L.-C., Canac Y., Chang L. L., Chatani N., Chen M. S., Chiong H. A., Cho J. -Y., Christ M. L., Clement N. D., Crabtree R. H., Daugulis O., Daugulis O., Diederich F., Do H.-Q., Dwyer C. L., Dyker G., Esteruelas M. A., Ferreira E. M., Gant T. G., Garcia-Cuadrado D., Graczyk P. P., Gribble M., Herrmann W. A., Hillier A. C., Hlasta D. J., Ishiyama T., Jia C. G., Johnson J. B., Kakiuchi F., Kakiuchi F., Kalyani D., Klingler R. J., Kreher R., Larhed M., Lewis J. C., Lewis J. C., Lewis J. C., Lewis J. C., Michael J. P., Miura M., Moore E. J., Netherton M. R., Peters M. W., Pivsa-Art S., Rech J. C., Ritleng V., Stuart D. R., Tan K. L., Tan K. L., Tan K. L., Tan K. L., Tan K. L., Tunge J. A., van Assema S. G. A., Wiedemann S. H., Wiedemann S. H., Wiedemann S. H., Yanagisawa S., Zharekeev B. K.   +64 more
core   +2 more sources

Pyridylidene ligand facilitates gold-catalyzed oxidative C–H arylation of heterocycles

Beilstein Journal of Organic Chemistry, 2015
Triaryl-2-pyridylidene effectively facilitates the gold-catalyzed oxidative C–H arylation of heteroarenes with arylsilanes as a unique electron-donating ligand on gold.
Kazuhiro Hata, Hideto Ito, Yasutomo Segawa, Kenichiro Itami   +3 more
doaj   +1 more source