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Littérature scientifique sur le sujet « Carbenes (Methylene compounds) Ligands »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 1 février 2022

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Articles de revues sur le sujet "Carbenes (Methylene compounds) Ligands"

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Monopoli, Antonio, Pietro Cotugno, Carlo Giorgio Zambonin, Francesco Ciminale, and Angelo Nacci. "Highly selective palladium–benzothiazole carbene-catalyzed allylation of active methylene compounds under neutral conditions." Beilstein Journal of Organic Chemistry 11 (June 10, 2015): 994–99. http://dx.doi.org/10.3762/bjoc.11.111.

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The Pd–benzothiazol-2-ylidene complex I was found to be a chemoselective catalyst for the Tsuji–Trost allylation of active methylene compounds carried out under neutral conditions and using carbonates as allylating agents. The proposed protocol consists in a simplified procedure adopting an in situ prepared catalyst from Pd2dba3 and 3-methylbenzothiazolium salt V as precursors. A comparison of the performance of benzothiazole carbene with phosphanes and an analogous imidazolium carbene ligand is also proposed.

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Mihajlovic-Lalic, Ljiljana, Aleksandar Savic, Gabrijela Bradjan, Tibor Sabo, and Sanja Grguric-Sipka. "Novel methylene bridged ethylenediamine-type ligands: Synthesis and spectral characterization." Journal of the Serbian Chemical Society 79, no. 10 (2014): 1199–204. http://dx.doi.org/10.2298/jsc140212042m.

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Herein we report the synthesis of two new organic compounds, diisobutyl- and diisopentyl N,N?-methylene-(S,S)-ethylenediamine-N,N?-di-2-(3-cyclohexyl)propanoate. A one-pot procedure was carried out by adding the reducing agent and carbonyl compound into the methanol solution of the parent compounds (iso-butyl and iso-pentyl esters of (S,S)-ethylenediamine-N,N?-di-2-(3-cyclohexyl)propanoic acid) in appropriate stoichiometric ratios. The compounds were fully characterized by infrared, ESI-MS, 1D (1H, 13C) and 2D (COSY, HSQC, HMBC) NMR spectroscopy and elemental analysis. The spectral data confir

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Fernández-Moreira, Vanesa, Raquel P. Herrera, and M. Concepción Gimeno. "Anticancer properties of gold complexes with biologically relevant ligands." Pure and Applied Chemistry 91, no. 2 (2019): 247–69. http://dx.doi.org/10.1515/pac-2018-0901.

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Abstract The present review highlights our findings in the field of antitumor gold complexes bearing biologically relevant molecules, such as DNA-bases, amino acids or peptide derivatives. The results show that very active complexes are achieved with this sort of ligands in several cancer cells. In these compounds the gold center is bonded to these biological molecules mainly through a sulfur atom belonging to a cysteine moiety or to a thionicotinic moiety as result of the functionalization of the biological compounds, and additionally phosphines or N-heterocyclic carbenes are present as ancil

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Jamil, Mohamad Shazwan Shah, and Nor Azam Endot. "Influence of Fluorine Substituents on the Electronic Properties of Selenium-N-Heterocyclic Carbene Compounds." Molecules 25, no. 21 (2020): 5161. http://dx.doi.org/10.3390/molecules25215161.

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N-heterocyclic carbenes (NHCs) are common ancillary ligands in organometallic compounds that are used to alter the electronic and steric properties of a metal centre. To date, various NHCs have been synthesised with different electronic properties, which can be done by modifying the backbone or changing the nitrogen substituents group. This study describes a systematic modification of NHCs by the inclusion of fluorine substituents and examines the use of selenium-NHC compounds to measure the π-accepting ability of these fluorinated NHC ligands. Evaluation of the 77Se NMR chemical shifts of the

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You, Zhonglu, Yingying Luo, Susan Herringer, et al. "Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties." Crystals 10, no. 7 (2020): 592. http://dx.doi.org/10.3390/cryst10070592.

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The cubane-type structure is a typical representative of tetranuclear coordination compounds. In this work, two anionic Schiff-base ligands, (L1)2− and (L2)2−, each offering an O^N^O coordination pocket, ligate four NiII ions into a [Ni4O4] cubane core. The ligands are H2L1 = 2−[[(3-ethoxy-2−hydroxyphenyl) methylene]amino]benzenemethanol and H2L2 = 2−[[(5-fluoro-2−hydroxyphenyl)methylene]amino]benzenemethanol. In both compounds, [Ni4(L1)4(EtOH)4] (1) and [Ni4(L2)4(MeOH)4] (2), alkoxy oxygens of the ligands act in a bridging μ3-O binding mode. Magnetic susceptibility and magnetization data for

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Tang, Xiang-Ting, Fan Yang, Ting-Ting Zhang, et al. "Recent Progress in N-Heterocyclic Carbene Gold-Catalyzed Reactions of Alkynes Involving Oxidation/Amination/Cycloaddition." Catalysts 10, no. 3 (2020): 350. http://dx.doi.org/10.3390/catal10030350.

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Recent rapid development in homogeneous gold catalysis affords an alternative and particularly thriving strategy for the generation of gold carbenes through gold-catalyzed oxidation/amination/cycloaddition of alkynes, while it avoids the employment of hazardous and potentially explosive diazo compounds as starting materials for carbene generation. In addition to facile and secure operation, gold carbenes generated in this strategy display good chemoselectivity distinct from other metal carbenes produced from the related diazo approach. N-heterocyclic carbene (NHC) gold is a special metal compl

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Bal, Selma, and Sedat Salih Bal. "Cobalt(II) and Manganese(II) Complexes of Novel Schiff Bases, Synthesis, Charcterization, and Thermal, Antimicrobial, Electronic, and Catalytic Features." Advances in Chemistry 2014 (August 21, 2014): 1–12. http://dx.doi.org/10.1155/2014/506851.

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Carbazoles containing two new Schiff bases (Z,Z)-N,N′-bis[(9-ethyl-9H-carbazole-3-yl)methylene]propane-1,3 diamine (L1) and (Z,Z)-N,N′-bis[(9-ethyl-9H-carbazole-3-yl)methylene]-2,2-dimethylpropane-1,3-diamine (L2) and their Co(II) and Mn(II) complexes were synthesized and characterized using various spectroscopic methods and thermal analysis, which gave high thermal stability results for the ligands and their cobalt complexes. The title compounds were examined for their antimicrobial and antifungal activities, which resulted in high activity values for the ligands and their manganese complexes

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Vummaleti, Sai V. C., David J. Nelson, Albert Poater та ін. "What can NMR spectroscopy of selenoureas and phosphinidenes teach us about the π-accepting abilities of N-heterocyclic carbenes?" Chemical Science 6, № 3 (2015): 1895–904. http://dx.doi.org/10.1039/c4sc03264k.

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Wezeman, Tim, Yuling Hu, John McMurtrie, Stefan Bräse, and Kye-Simeon Masters. "Synthesis of Non-Symmetrical and Atropisomeric Dibenzo[1,3]diazepines: Pd/CPhos-Catalysed Direct Arylation of Bis-Aryl Aminals." Australian Journal of Chemistry 68, no. 12 (2015): 1859. http://dx.doi.org/10.1071/ch15465.

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Pd/CPhos-catalysis provides direct arylation/cyclisation of methylene-linked bis-anilines to dibenzo[1,3]diazepines v, which are both non-(C2)-symmetrical and axially chiral. Synthesis of the direct arylation substrates commences with substitution of (N-acyl)anilines to methylene methyl sulfide derivatives, followed by halogenation/de-thiomethylation to N-(chloromethyl)anilines. These are substituted with a second aniline derivative, allowing modular preparation of (ortho-halo)aryl-aminal-linked arenes 4. The C–H functionalising direct arylation conditions were adapted from Fagnou and co-worke

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Diesel, Johannes, and Nicolai Cramer. "Modular Chiral N-Heterocyclic Carbene Ligands for the Nickel-Catalyzed Enantioselective C–H Functionalization of Heterocycles." CHIMIA International Journal for Chemistry 74, no. 4 (2020): 278–84. http://dx.doi.org/10.2533/chimia.2020.278.

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N-Heterocyclic carbenes (NHCs) are the ligands of choice in a large variety of transformations entailing different transition metals. However, the number and variety of chiral NHCs suitable as stereo-controlling ligands in asymmetric catalysis remains limited. Herein we highlight the introduction of a modular NHC ligand family, consisting of a chiral version of the widely used IPr ligand. These chiral NHC ligands were applied in the nickel-catalyzed enantioselective C–H functionalization of N-heterocycles. Nickel-NHC catalysis unlocked the stereoselective C–H annulation of 2- and 4-pyridones,

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Thèses sur le sujet "Carbenes (Methylene compounds) Ligands"

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Olivier, Andrew John. "Novel carbene complexes with pyrrole ligands." Diss., Pretoria : [s.n, 2001. http://upetd.up.ac.za/thesis/available/etd-02242006-125303/.

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Asay, Matt J. "Ylides stabilization of novel, low valent carbon-based ligands with applications in catalysis /." Diss., [Riverside, Calif.] : University of California, Riverside, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3350076.

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Thesis (Ph. D.)--University of California, Riverside, 2009.<br>Includes abstract. Title from first page of PDF file (viewed Mar. 8, 2010). Includes bibliographical references. Issued in print and online. Available via ProQuest Digital Dissertations.

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Etogo, Anthony O. "Late transition metal chemistry of imidazole-based N-heterocyclic carbene ligands synthesis, characterization and luminescence /." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3209961.

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Truscott, Byron John. "The design and synthesis of multidentate N-heterocyclic carbenes as metathesis catalyst ligands." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1004962.

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This study has focused on the design and preparation of bi– and tridentate N–Heterocyclic Carbene (NHC) ligands in order to investigate the effect of a multidentate approach to the formation, stability and catalytic activity of coordination complexes. Chapters 1 – 3 provide background information of relevant catalysis, carbene and coordination chemistry, followed by previous work performed within our research group. In Chapter 4 attention is given to the synthetic aspects of the research conducted, comprising two distinct approaches to the preparation of unsymmetrical saturated and unsaturated

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5

Chu, Wai-kin, and 朱煒堅. "Syntheses, spectroscopy and photophysics of ruthenium(II) carbene complexes and diimine complexes with functionalized ligands formolecular recognition and organized assembly." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31240082.

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Au, Ka-man, and 區嘉雯. "Luminescent cyclometalated gold (III) complexes with ancillary N-heterocyclic carbene and alkynyl ligands : from design, synthesis, photophysics to supramolecular assembly and functions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hdl.handle.net/10722/207995.

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A library of luminescent cyclometalated gold(III) complexes containing various bis-cyclometalating R-C^N^C ligands derived from 2,6-diphenylpyridine and ancillary alkynyl ligands, [Au(R-C^N^C)(C≡CR’)], has been synthesized. Some of the complexes have been structurally determined by X-ray crystallography. These complexes were found to exhibit intense emission in dichloromethane solution at 298 K, originating from metal-perturbed triplet intraligand (IL) excited states of the R-C^N^C ligand, with substantial charge transfer character from the aryl moiety to the pyridyl ring. In the presen

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Du, Toit Aletta. "Anioniese Fischer-tipe karbeenkomplekse as ligande." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53280.

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Landman, Marile. "Synthesis of metal complexes with thiophene ligands." Thesis, Access to E-Thesis, 2000. http://upetd.up.ac.za/thesis/available/etd-12042006-143722/.

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Du, Toit Maria. "Nuwe karbeenkomplekse en die 'kompleks van komplekse' konsep in ligandontwerp." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53530.

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Zou, Taotao, and 邹滔滔. "Anti-cancer N-heterocyclic carbene complexes of gold(III), gold(I) and platinum(II) : thiol "switch-on" fluorescent probes, thioredoxin reductase inhibitors and endoplasmic reticulum targeting agents." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2015. http://hdl.handle.net/10722/208614.

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Livres sur le sujet "Carbenes (Methylene compounds) Ligands"

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Metal carbenes in organic synthesis. Wiley-VCH, 1999.

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Nefedov, O. M. Khimii͡a︡ karbenov. Khimii͡a︡, 1990.

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V, Kazimirchik I., Lukin K. A, and Nefedov O. M, eds. T͡S︡ikloprisoedinenie dikhlorkarbena k olefinam. "Nauka", 1985.

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U, Schubert, ed. Advances in metal carbene chemistry. Kluwer Academic Publishers, 1989.

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N-heterocyclic carbenes: From laboratory curiosities to efficient synthetic tools. Royal Society of Chemistry, 2011.

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Cazin, Catherine Suzanne Julienne. N-Heterocyclic Carbenes in Transition Metal Catalysis and Organocatalysis. Springer Science+Business Media B.V., 2011.

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G, Bertrand, ed. Carbene chemistry: From fleeting intermediates to powerful reagents. Marcel Dekker, 2002.

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Bertrand, Guy. Carbene Chemistry: From Fleeting Intermediates to Powerful Reagents. CRC, 2002.

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Dötz, K. H. Metal Carbenes in Organic Synthesis. Springer, 2004.

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Nolan, Steven P. N-Heterocyclic Carbenes in Synthesis. Wiley-VCH, 2006.

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