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Relevant bibliographies by topics / Carbeni

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Journal articles

Academic literature on the topic 'Carbeni'

Author: Grafiati

Published: 10 March 2023

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Journal articles on the topic "Carbeni"

1

Poirel, Laurent, Michele Guibert, Samuel Bellais, Thierry Naas, and Patrice Nordmann. "Integron- and Carbenicillinase-Mediated Reduced Susceptibility to Amoxicillin-Clavulanic Acid in Isolates of Multidrug-ResistantSalmonella enterica Serotype Typhimurium DT104 from French Patients." Antimicrobial Agents and Chemotherapy 43, no. 5 (1999): 1098–104. http://dx.doi.org/10.1128/aac.43.5.1098.

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ABSTRACT Fifty-seven Salmonella enterica serotype Typhimurium (S. typhimurium) isolates were collected from human patients in two French hospitals, Hôpital Antoine Béclère (Clamart, France) and Hôpital Bicêtre (Le Kremlin-Bicêtre, France), between 1996 and 1997. Thirty of them (52 percent) were resistant to amino-, carbeni-, and ureidopenicillins, had reduced susceptibility to amoxicillin-clavulanic acid, were susceptible to cephalothin, and were resistant to sulfonamides, streptomycin, chloramphenicol, and tetracyclines. All these strains possessed a bla PSE-1-like gene and were of phag

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2

KOROTKIKH, Nikolai, Gennady RAYENKO, Vagiz SABEROV, et al. "PHILICITY OF CARBENES. A NEW VIEW." Proceedings of the Shevchenko Scientific Society. Series Сhemical Sciences 2020, no. 60 (2020): 85–106. http://dx.doi.org/10.37827/ntsh.chem.2020.60.085.

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The electronic properties of carbenes including thermodynamic parameters such as new electronic philicity indices Ie, Ph, and for comparizon chemical hardnesses η, proton affinities (РA) calculated by DFT method (B3LYP5/6-31G*/RHF for definition of electronic indices and B3LYP5/3-21G/RHF, B3LYP5/3-21G/UHF for definition of chemical hard¬nesses) have been discussed in the paper. With their help, the estimation of philicities, electron-donating and electron-withdrawing abilities of a wide range of carbenes of both nucleophilic and electrophilic type was carried out. It was established that the p

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3

Frański, Rafał, Błażej Gierczyk, Grzegorz Schroeder, Stefan Pieper, Andreas Springer, and Michael Linscheid. "Electrospray ionization mass spectrometric study of mercury complexes of N-heterocyclic carbenes derived from 1,2,4-triazolium salt precursors." Open Chemistry 5, no. 1 (2007): 316–29. http://dx.doi.org/10.2478/s11532-006-0050-0.

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AbstractBy mixing 1,2,4-triazolium salts (precursors of N-heterocyclic carbenes 1–6) with mercury acetate, a number of complexes have been obtained under electrospray ionization condition. Carbenes 1 and 2 contain one carbene center; therefore, they are able to bond only one mercury cation. Carbenes 3–5 contain two carbene centers; therefore, they can bond two mercury cations. Mercury complexes of 1–5 always contain an acetate anion attached to a mercury cation. Carbene 6 also contains two carbene centers; however, its structure allows formation of a complex containing mercury bonded simultane

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4

Andrada, Diego M., Nicole Holzmann, Thomas Hamadi та Gernot Frenking. "Direct estimate of the internal π-donation to the carbene centre within N-heterocyclic carbenes and related molecules". Beilstein Journal of Organic Chemistry 11 (24 грудня 2015): 2727–36. http://dx.doi.org/10.3762/bjoc.11.294.

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Fifteen cyclic and acylic carbenes have been calculated with density functional theory at the BP86/def2-TZVPP level. The strength of the internal X→p(π) π-donation of heteroatoms and carbon which are bonded to the C(II) atom is estimated with the help of NBO calculations and with an energy decomposition analysis. The investigated molecules include N-heterocyclic carbenes (NHCs), the cyclic alkyl(amino)carbene (cAAC), mesoionic carbenes and ylide-stabilized carbenes. The bonding analysis suggests that the carbene centre in cAAC and in diamidocarbene have the weakest X→p(π) π-donation while meso

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5

Cui, Peng, Melissa R. Hoffbauer, Mariya Vyushkova, and Vlad M. Iluc. "Heterobimetallic Pd–K carbene complexes via one-electron reductions of palladium radical carbenes." Chemical Science 7, no. 7 (2016): 4444–52. http://dx.doi.org/10.1039/c6sc00948d.

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Unprecedented sequential substitution/reduction synthetic strategy on the Pd radical carbenes afforded heterobimetallic Pd–K carbene complexes, which features novel Pd–C<sub>carbene</sub>–K structural moieties.

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6

Chen, Kai, Xiongyi Huang, Shuo-Qing Zhang, et al. "Engineered Cytochrome c-Catalyzed Lactone-Carbene B–H Insertion." Synlett 30, no. 04 (2019): 378–82. http://dx.doi.org/10.1055/s-0037-1611662.

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Previous work has demonstrated that variants of a heme protein, Rhodothermus marinus cytochrome c (Rma cyt c), catalyze abiological carbene boron–hydrogen (B–H) bond insertion with high efficiency and selectivity. Here we investigated this carbon–boron bond-forming chemistry with cyclic, lactone-based carbenes. Using directed evolution, we obtained a Rma cyt c variant BORLAC that shows high selectivity and efficiency for B–H insertion of 5- and 6-membered lactone carbenes (up to 24,500 total turnovers and 97.1:2.9 enantiomeric ratio). The enzyme shows low activity with a 7-membered lactone car

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7

García, Lucía, Khalidah H. M. Al Furaiji, David J. D. Wilson, Jason L. Dutton, Michael S. Hill, and Mary F. Mahon. "Ring expansion of a ring expanded carbene." Dalton Transactions 46, no. 36 (2017): 12015–18. http://dx.doi.org/10.1039/c7dt03046k.

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8

Hollóczki, Oldamur. "Unveiling the peculiar hydrogen bonding behavior of solvated N-heterocyclic carbenes." Physical Chemistry Chemical Physics 18, no. 1 (2016): 126–40. http://dx.doi.org/10.1039/c5cp05369b.

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After fitting a molecular mechanical force field for imidazol-2-ylidenes, MD simulations revealed carbene–carbene and three-center hydrogen bonds of carbenes. The practical importance of these structures is also highlighted.

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9

Dong, Zhaowen, Cristian Pezzato, Andrzej Sienkiewicz, Rosario Scopelliti, Farzaneh Fadaei-Tirani, and Kay Severin. "SET processes in Lewis acid–base reactions: the tritylation of N-heterocyclic carbenes." Chemical Science 11, no. 29 (2020): 7615–18. http://dx.doi.org/10.1039/d0sc01278e.

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10

Pezacki, John Paul. "Normal acid/base behaviour in proton transfer reactions to alkoxy substituted carbenes: estimates for intrinsic barriers to reaction and pKa values." Canadian Journal of Chemistry 77, no. 7 (1999): 1230–40. http://dx.doi.org/10.1139/v99-087.

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Theoretical Eigen curves can be drawn through Brønsted data for dimethoxycarbene (1), phenyltrimethyl-siloxycarbene (3a), 4-methylphenyl(trimethylsiloxy)carbene (3b), 4-methoxyphenyl(trimethylsiloxy)carbene (3c), and β-naphthyl(trimethylsiloxy)carbene (3d). The Brønsted plots for these data are clearly curved with α values near 1 when proton transfer is thermodynamically unfavourable and α values near 0 when proton transfer is thermodynamically favourable, suggesting that these carbenes behave as "normal" Brønsted bases. Estimates of the intrinsic barriers (ΔG0‡) for proton transfer reactions

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