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Littérature scientifique sur le sujet « Metatesi olefinica »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Metatesi olefinica"

Patrzałek, Michał, Aleksandra Zasada, Anna Kajetanowicz et Karol Grela. « Tandem Olefin Metathesis/α-Ketohydroxylation Revisited ». Catalysts 11, n^o 6 (9 juin 2021) : 719. http://dx.doi.org/10.3390/catal11060719.

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EWG-activated and polar quaternary ammonium salt-tagged ruthenium metathesis catalysts have been applied in a two-step one-pot metathesis-oxidation process leading to functionalized α-hydroxyketones (acyloins). In this assisted tandem process, the metathesis catalyst is used first to promote ring-closing metathesis (RCM) and cross-metathesis (CM) steps, then upon the action of Oxone™ converts into an oxidation catalyst able to transform the newly formed olefinic product into acyloin under mild conditions.

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Drège, E., J. Oko, P. E. Venot, N. Gigant et D. Joseph. « Microwave-assisted telescoped cross metathesis-ring closing aza-Michael reaction sequence : step-economical access to nicotine–lobeline hybrid analogues ». RSC Advances 5, n^o 117 (2015) : 96720–24. http://dx.doi.org/10.1039/c5ra20930g.

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Step-economical access to nicotinic acetylcholine receptor ligands hybrids through an efficient telescoped cross-metathesis/cyclizing aza-Michael addition involving N-heteroaromatic olefinic derivatives.

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Fischmeister, Cédric, et Christian Bruneau. « Ene–yne cross-metathesis with ruthenium carbene catalysts ». Beilstein Journal of Organic Chemistry 7 (4 février 2011) : 156–66. http://dx.doi.org/10.3762/bjoc.7.22.

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Conjugated 1,3-dienes are important building blocks in organic and polymer chemistry. Enyne metathesis is a powerful catalytic reaction to access such structural domains. Recent advances and developments in ene–yne cross-metathesis (EYCM) leading to various compounds of interest and their intermediates, that can directly be transformed in tandem procedures, are reviewed in this article. In addition, the use of bio-resourced olefinic substrates is presented.

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Postema, Maarten H. D., et Jared L. Piper. « Cross-metathesis and ring-closing metathesis of olefinic monosaccharides ». Tetrahedron Letters 43, n^o 39 (septembre 2002) : 7095–99. http://dx.doi.org/10.1016/s0040-4039(02)01617-9.

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Balcar, Hynek, et Jiří Čejka. « SBA-15 as a Support for Effective Olefin Metathesis Catalysts ». Catalysts 9, n^o 9 (2 septembre 2019) : 743. http://dx.doi.org/10.3390/catal9090743.

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Olefin metathesis is the catalytic transformation of olefinic substrates, finding a wide range of applications in organic synthesis. The mesoporous molecular sieve Santa Barbara Amorphous (SBA-15) has proven to be an excellent support for metathesis catalysts thanks to its regular mesoporous structure, high BET area, and large pore volume. A survey of catalysts consisting of (i) molybdenum and tungsten oxides on SBA-15, and (ii) molybdenum and ruthenium organometallic complexes (Schrock and Grubbs-type carbenes) on SBA-15 is provided together with their characterization and catalytic performance in various metathesis reactions. The comparison with catalysts based on other supports demonstrates the high quality of the mesoporous molecular sieve SBA-15 as an advanced catalyst support.

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Kotha, Sambasivarao, et Mirtunjay Kumar Dipak. « Design and synthesis of novel bis-annulated caged polycycles via ring-closing metathesis : pushpakenediol ». Beilstein Journal of Organic Chemistry 10 (13 novembre 2014) : 2664–70. http://dx.doi.org/10.3762/bjoc.10.280.

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Intricate caged molecular frameworks are assembled by an atom economical process via a Diels–Alder (DA) reaction, a Claisen rearrangement, a ring-closing metathesis (RCM) and an alkenyl Grignard addition. The introduction of olefinic moieties in the pentacycloundecane (PCUD) framework at appropriate positions followed by RCM led to the formation of novel heptacyclic cage systems.

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Krishna, Palakodety, Govinda Kundoor et Suresh Battina. « A Concise and Stereoselective Total Synthesis of Pestalotioprolide C Using Ring-Closing Metathesis ». Synthesis 50, n^o 05 (20 décembre 2017) : 1152–58. http://dx.doi.org/10.1055/s-0036-1589152.

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The stereoselective total synthesis of the pestalotioprolide C is disclosed in 13 linear steps in 4% overall yield. The key steps in this approach are a ring-closing-metathesis protocol for the construction of the 14-membered macrolide with E-olefinic bond, a Keck allylation, and a Sharpless kinetic resolution for the installation of desired stereocenters at C4 and C7.

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Ramnauth, Jailall, et Edward Lee-Ruff. « Photocycloelimination of α,α-dichlorocyclobutanones ». Canadian Journal of Chemistry 77, n^o 7 (1 juillet 1999) : 1245–48. http://dx.doi.org/10.1139/v99-110.

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Direct irradiation of a series of α,α-dichlorocyclobutanones in benzene solutions results in photocycloelimination to give 1,1-dichloroalkenes in yields ranging from 30-65%. The α,α-dichlorocyclobutanones were formed in good yields from the [2+2] cycloaddition of the terminal olefins with dichloroketene. This two-step sequence formally represents a "metathesis" of two olefinic functions and provides an easy access to functionalized 1,1-dichloroalkenes. Irradiation of the dichlorocyclobutanones in the solid state led to poor yields of 1,1-dichloroalkenes and polymeric mixtures, however, photoreactions performed in zeolites gave similar yields as those run in benzene solutions.Key words: dichlorocyclobutanones, dichloroalkenes, olefin metathesis, photocycloelimination.

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Chen, Cong-Yan, et Dennis J. O'Rear. « Disproportionation of Alkanes via Molecular Redistribution and Molecular Averaging ». Collection of Czechoslovak Chemical Communications 73, n^o 8-9 (2008) : 1105–11. http://dx.doi.org/10.1135/cccc20081105.

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In this paper the disproportionation of alkanes via molecular redistribution (MR) and molecular averaging (MA) is discussed. MR/MA chemistry consists of three steps occurring in one single catalyst bed over a bifunctional catalyst system: dehydrogenation of alkanes to olefinic intermediates, metathesis (disproportionation) of these olefin species and hydrogenation of the metathesis products to alkanes. MR/MA represents a unique and rare example of bifunctional heterogeneous catalysis while there are many examples of acid components being one of the bifunctional elements with a metal, e.g., in reforming, hydrocracking and isomerization reactions. MR/MA chemistry provides simple processes which can be accomplished otherwise only via combinations of other existing chemistries. In this paper, we will use MR of pentanes as an example to demonstrate one industrial application of the MR chemistry.

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Andreana, Peter R., Jason S. McLellan, Yongchen Chen et Peng George Wang. « Synthesis of 2,6-Dideoxysugars via Ring-Closing Olefinic Metathesis ». Organic Letters 4, n^o 22 (octobre 2002) : 3875–78. http://dx.doi.org/10.1021/ol026710m.

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Thèses sur le sujet "Metatesi olefinica"

Paradiso, Veronica. « Ruthenium metathesis precatalysts with unsymmetrical Nheterocyclic carbene (NHC) ligands ». Doctoral thesis, Universita degli studi di Salerno, 2018. http://hdl.handle.net/10556/3017.

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2016 - 2017
Olefin metathesis is one of the most important chemical transformations for the formation of carbon-carbon double bonds. The possibility to build up highly funtionalised alkenes starting from simple olefins makes this reaction indispensable in modern organic synthesis, giving access to a wide range of molecules that would be barely obtained through other synthetic routes. The success of metathesis is due to the development of new and efficient catalysts which can be used in a wide variety of research fields, both in industry and in academia. In this context, the research of the ‘perfect’ metathesis complex still impassions scientists all over the word, and several research papers regarding the development of new catalytic systems are published every year. The group I am part of focuses its attention on the development of new ruthenium metathesis catalysts. Our interest lies in the influence that nature and configuration of substituents on the N-heterocyclic carbene (NHC) ligand could have on the performances of the corresponding metal complexes. In this doctoral thesis, the field of unsymmetrical N-heterocyclic carbene (u-NHC) ruthenium catalysts will be explored. Synthesis and characterisation of several novel complexes will be discussed. Catalytic performances will be evaluated in model metathesis reactions as well as in more attractive metathesis transformations. The relationship between NHC structure and complexes’ behaviours will be investigated using NMR, X-Ray, IR, cyclic voltammetry and DFT calculations. ..[edited by Author]
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Chrubasik, Maciej. « Synteza glikokoniugatów pochodnych polifenoli z wykorzystaniem metatezy olefinowej ». Rozprawa doktorska, 2010. https://repolis.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=1121.

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Chrubasik, Maciej. « Synteza glikokoniugatów pochodnych polifenoli z wykorzystaniem metatezy olefinowej ». Rozprawa doktorska, 2010. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=1121.

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