Results 11 to 20 of about 14,653 (264)

Bulky-yet-flexible carbene ligands and their use in palladium cross-coupling [PDF]

, 2019
In recent years, several classes of new N-heterocyclic carbene (NHC) ligands were developed around the concept of flexible steric bulk. The steric hindrance of these ligands brings stability to the active species, while ligand flexibility still allows ...
Cazin, Catherine, Nahra, Fady, Vanden Broeck, Sofie   +2 more
core   +1 more source

Ruthenium-Based Heterocyclic Carbene-Coordinated Olefin Metathesis Catalysts [PDF]

, 2010
The fascinating story of olefin (or alkene) metathesis (eq 1) began almost five decades ago, when Anderson and Merckling reported the first carbon-carbon double-bond rearrangement reaction in the titanium-catalyzed polymerization of norbornene.
Grubbs, Robert H., Vougioukalakis, Georgios C.   +1 more
core   +1 more source

New phosphorus-containing polycycles with a spiroamine group

Журнал органічної та фармацевтичної хімії, 2022
Aim. To synthesize hexahydrospiro[cyclopropane-1,10’-pyrido[1,2-c]quinazoline] and 2-λ5-benzo[f][1,4,2]diazaphosphepine derivatives – new N-P containing heterocyclic compounds with the 6-azaspiro[2.5]octane fragment. Results and discussion. A new analog
Grygorii M. Koidan, Anatolii P. Marchenko, Anastasiia M. Hurieva, Aleksandr M. Kostyuk   +3 more
doaj   +1 more source

Reactive Palladium Carbenes: Migratory Insertion and Other Carbene-Hydrocarbyl Coupling Reactions on Well-Defined Systems [PDF]

, 2018
Producción CientíficaPalladium complexes with carbene ligands are among the best known and more extensively used catalysts. Those carbenes are usually NHC or N,N-disubstituted derivatives and their use relies on the robust nature of the carbene ligands ...
Albéniz Jiménez, Ana Carmen
core   +2 more sources

Synthesis of New Organoselenium Compounds: Characterization and Biological Studies

Macedonian Journal of Chemistry and Chemical Engineering, 2020
Two new organoselenium analogs, (3,3'-(1,2-phenylenebis(methylene))bis(2-selenoxo-2,3-dihydro-1H-imidazole-3,1-diyl))bis(methylene) dibenzoate (III) and 3,3'-(1,2-phenylenebis(methylene))bis(1-benzyl-1H-imidazole-2(3H)-selenone) (V), were derived from ...
Nimra Naz, Saima Saqib, Rizwan Ashraf, Muhammad Irfan Majeed, Muhammad Adnan Iqbal   +4 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-based gold etchants

Beilstein Journal of Nanotechnology, 2023
N-Heterocyclic carbenes (NHCs) are an emerging alternative to thiols for the formation of stable self-assembled monolayers (SAMs) on gold. We examined several different species that have been used to produce NHC-based monolayers on gold, namely 1,3-diisopropyl-5-nitrobenzimidazolium iodide, 1,3-diisopropyl-5-nitrobenzimidazolium hydrogen carbonate, bis(
Robert B Chevalier, Justin Pantano, Matthew K Kiesewetter, Jason R Dwyer   +3 more
openaire   +3 more sources

Copper-catalyzed dehydrogenative borylation of terminal alkynes with pinacolborane. [PDF]

, 2016
LCuOTf complexes [L = cyclic (alkyl)(amino)carbenes (CAACs) or N-heterocyclic carbenes (NHCs)] selectively promote the dehydrogenative borylation of C(sp)-H bonds at room temperature.
Bertrand, Guy, Jazzar, Rodolphe, Romero, Erik A   +2 more
core   +1 more source

α-IMINOCARBENOS METÁLICOS DERIVADOS DE N-SULFONIL-1,2,3-TRIAZÓIS NA SÍNTESE DE ALCALOIDES [PDF]

Química Nova
The study of carbenes and metal carbenes has attracted researchers from different countries due to the versatility of these reactive species in preparative organic chemistry.
Vinícius V. Souza, Cristiano Raminelli
doaj   +1 more source

Access to cationic polyhedral carboranes via dynamic cage surgery with N-heterocyclic carbenes

Nature Communications, 2021
In comparison to their neutral or anionic counterparts, examples of cationic boron clusters remain scarce. Here, the authors prepare a variety of cationic polyhedral boranes by reacting closo-10-vertex carboranes with N-heterocyclic carbenes; the ...
Jan Vrána, Josef Holub, Maksim A. Samsonov, Zdeňka Růžičková, Josef Cvačka, Michael L. McKee, Jindřich Fanfrlík, Drahomír Hnyk, Aleš Růžička   +8 more
doaj   +1 more source