Results 11 to 20 of about 35,108 (280)

Experimental and theoretical investigations on the high-electron donor character of pyrido-annelated N-heterocyclic carbenes

Beilstein Journal of Organic Chemistry, 2016
Rh(CO)2Cl(NHC) complexes of dipyrido-annelated N-heterocyclic carbenes were prepared. From the C–H coupling constant of the respective imidazolium salts and the N–C–N angle of the N-heterocyclic carbene (NHC), a weaker σ-donor character than that of ...
Michael Nonnenmacher, Dominik M. Buck, Doris Kunz   +2 more
doaj   +1 more source

Blue Phosphorescence and Hyperluminescence Generated from Imidazo[4,5‐b]pyridin‐2‐ylidene‐Based Iridium(III) Phosphors

Advanced Science, 2022
Four isomeric, homoleptic iridium(III) metal complexes bearing 5‐(trifluoromethyl)imidazo[4,5‐b]pyridin‐2‐ylidene and 6‐(trifluoromethyl)imidazo[4,5‐b]pyridin‐2‐ylidene‐based cyclometalating chelates are successfully synthesized.
Xilin Yang, Xiuwen Zhou, Ye‐Xin Zhang, Deli Li, Chensen Li, Caifa You, Tai‐Che Chou, Shi‐Jian Su, Pi‐Tai Chou, Yun Chi   +9 more
doaj   +1 more source

New Insight into the Reactivity of S,S-Bis-ylide

Molecules, 2023
The present work focuses on the reactivity of S,S-bis-ylide 2, which presents a strong nucleophilic character, as evidenced by reactions with methyl iodide and CO2, affording C-methylated salts 3 and betaine 4, respectively. The derivatization of betaine
Ugo Authesserre, V. S. V. S. N. Swamy, Nathalie Saffon-Merceron, Antoine Baceiredo, Tsuyoshi Kato, Eddy Maerten   +5 more
doaj   +1 more source

1,3-Bis(2,4,6-trimethylphenyl)imidazolium perchlorate

IUCrData, 2019
The title compound, C21H25N2+·ClO4−, arose as an unexpected oxidation product of the carbene 1,3-bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidine in methanol.
Ruiyao Wang, Manuel A.S. Aquino
doaj   +1 more source

X-H Bond Insertion Promoted by Heterogeneous Dirhodium Metal–Organic Cage with Alkynes as Safe Carbene Precursors

Molecules, 2023
A facile and efficient methodology for the generation of the C-X (X = Si, B) bond through a carbene insertion process was demonstrated using a dirhodium metal–organic cage, MOC-Rh-1, as a heterogeneous catalyst.
Lianfen Chen, Chaoyi Zhao, Weixian Mo, Chunsheng Li, Xiaoming Lin   +4 more
doaj   +1 more source

Transmetalation from Magnesium–NHCs—Convenient Synthesis of Chelating π-Acidic NHC Complexes

Inorganics, 2019
The synthesis of chelating N-heterocyclic carbene (NHC) complexes with considerable π-acceptor properties can be a challenging task. This is due to the dimerization of free carbene ligands, the moisture sensitivity of reaction intermediates or ...
Julian Messelberger, Annette Grünwald, Philipp Stegner, Laura Senft, Frank W. Heinemann, Dominik Munz   +5 more
doaj   +1 more source

Synthesis and trapping of spiro [bicyclo[4.2.0]octa-2,3-diene-7,2'-[1,3]dioxolane]

Journal of New Results in Science, 2023
Spiro[bicyclo[3.2.0]hept-2-ene-6,2'-[1,3]dioxolane] was synthesized by the reaction of bicyclo[3.2.0]hept-2-en-6-one with ethylene glycol in yield of 92%.
Esra Koç, Mustafa Ceylan
doaj   +1 more source

1,3-Bis(2,6-diisopropylphenyl)imidazolium perchlorate

IUCrData, 2018
The title salt, C27H37N2+·ClO4−, arose as an unexpected oxidation product of the carbene 1,3-bis(2,6-diisopropylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene in methanol.
Samuel A. Minaker, Ruiyao Wang, Manuel A. S. Aquino   +2 more
doaj   +1 more source

N‐Heterocyclic Carbene Organocatalysis: With or Without Carbenes?

Chemistry – A European Journal, 2020
AbstractIn this work the mechanism of the aldehyde umpolung reactions, catalyzed by azolium cations in the presence of bases, was studied through computational methods. Next to the mechanism established by Breslow in the 1950s that takes effect through the formation of a free carbene, we have suggested that these processes can follow a concerted ...
Sascha Gehrke, Oldamur Hollóczki
openaire   +2 more sources

SYNTHESIS, CHARACTERIZATION AND BIOLOGICAL ACTIVITIES OF 3-(2-HYDROXYETHYL)-1-(3-AMINOPROPYL)-1H-IMIDAZOLE-3-IUM BROMIDE

Trakya University Journal of Natural Sciences, 2017
3-(2-hydroxyethyl)-1-(3-aminopropyl)-1H-imidazole-3-ium bromide as an N-heterocyclic carbene salt was synthesized by the reaction of 3-(1H-imidazole-1-yl )propane -1-amine with 2-bromoethanol.
Gühergül Uluçam
doaj   +1 more source