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Relevant bibliographies by topics / C-alkylation

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Academic literature on the topic 'C-alkylation'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "C-alkylation"

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Merkhatuly, N., A. N. Iskanderov, А. Т. Omarova, P. Vojtíšek та S. K. Zhokizhanova. "The reaction of C-alkylation of eudesmanolide (–)-α-santonin". Bulletin of the Karaganda University. "Chemistry" series 94, № 2 (2019): 14–18. http://dx.doi.org/10.31489/2019ch2/14-18.

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Gurgui-Ionescu, Catalina, Loïc Toupet, Lycia Uttaro, Alain Fruchier, and Véronique Barragan-Montero. "O-Alkylation versus C-alkylation under Mitsunobu conditions." Tetrahedron 63, no. 38 (2007): 9345–53. http://dx.doi.org/10.1016/j.tet.2007.07.002.

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Hume, Paul A., Margaret A. Brimble, and Jóhannes Reynisson. "The Bioreductive Alkylation of DNA by Kalafungin: A Theoretical Investigation." Australian Journal of Chemistry 65, no. 4 (2012): 402. http://dx.doi.org/10.1071/ch12018.

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The thermochemical cascades for the bioreductive alkylation of DNA by kalafungin were calculated using density functional theory (DFT). Guanine (G) was used as a model nucleotide. According to the calculations both one- and two-electron reduction of kalafungin is possible in vivo. Furthermore, a clear pathway was found for both mono- and bis-alkylations of G with the former favoured. Alkylation at C-8 position of G is considerably more exothermic than on the N2-exocyclic amine. In the absence of experimentally identified adduct structures of kalafungin, the results presented here support the i

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Dong, Guangbin, Hee Lim та Dong Xing. "Transition-Metal-Catalyzed Ketone α-Alkylation and Alkenylation with Simple Alkenes and Alkynes through a Dual Activation Strategy". Synlett 30, № 06 (2018): 674–84. http://dx.doi.org/10.1055/s-0037-1610315.

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In this personal account, we summarize our investigations on the α-alkylation and α-alkenylation reactions of ketones with nonactivated alkenes and alkynes, respectively. The serendipitous discovery of C–H alkylation/alkenylation of cyclic 1,2-diketones provided a proof of concept for a dual activation strategy. Extension to the α-alkylation and α-alkenylation of regular ketones was achieved by using 7-azaindoline as a bifunctional ligand. Subsequently, intramolecular coupling between ketones and olefins was achieved with Rh- and Ru-based systems, respectively. Finally, branched-selective α-a

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Horňáček, Michal, Miroslava Bérešová, and Pavol Hudec. "An Environmentally Friendly Catalyst for Aromatic Hydrocarbons Alkylations with 1-alkenes." WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT 20 (December 16, 2024): 835–43. https://doi.org/10.37394/232015.2024.20.78.

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Nowadays, the alkylation of aromatic compounds using 1-alkenes is still conducted in industrial applications using Friedel-Crafts alkylations. The most commonly used catalysts are aluminum chloride (AlCl3) and hydrofluoric acid (HF), both of which pose significant environmental concerns. An alternative approach involves the use of solid acid catalysts, specifically zeolites, which may offer a more environmentally acceptable option. In this study, the alkylation of toluene with 1-decene was performed in a batch reactor under autogenous pressure in the liquid phase at a temperature of 100 °C. Ze

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Dehmlow, Eckehard V., and Sabine Schrader. "Notizen: Influence of Counter Ion Structure on the Direction of the Phase Transfer Catalytic Methylation of an Enol [1]." Zeitschrift für Naturforschung B 45, no. 3 (1990): 409–12. http://dx.doi.org/10.1515/znb-1990-0320.

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Phase transfer catalytic (PTC) methylations of deoxybenzoin by dimethyl sulfate can be steered towards enol ether formation by large, sterically shielded ammonium ions or – more strongly – by large highly delocalized phospho-iminium (and presumably other large) cations. The C-alkylation direction is favoured by small, hard ammonium ions of the type RNMe3+ and by crown ethers, particularly benzo-crowns. O/C ratios can be varied between 0,75 and 63, the largest effects so far reported for ambident anions. These results should give guide-lines for alkylations of other ambident ions.

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Catellani, Marta, Federica Cugini, and Domenico Tiefenthaler. "New pathways of site selective aromatic alkylation of palladium complexes: fragmentation to arenes vs. ring closure to hexahydromethano-fluorenes or -phenanthrenes." Canadian Journal of Chemistry 79, no. 5-6 (2001): 742–51. http://dx.doi.org/10.1139/v01-047.

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Dimeric arylbicycloheptylpalladium halide complexes of type 1 undergo selective alkylation at the aromatic site by reaction with allyl, styryl, and benzyl bromides (RBr) via hexahydromethanopalladafluorenes (2). Ring closure of the resulting palladium complex (7) on sp2 and sp3 C-H bonds of a suitable R group then occurs with formation of hexahydromethanophenanthrene or hexahydromethanofluorene derivatives. Alternatively, substituted arenes derived from bicycloheptene deinsertion are formed. In some cases the latter can be obtained in substantial amounts when methyl isonicotinate is used as li

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Yang, Xinglin, Gang Shan, Zimo Yang, et al. "One-pot synthesis of quaternary carbon centered cyclobutanes via Pd(ii)-catalyzed cascade C(sp3)–H activations." Chemical Communications 53, no. 9 (2017): 1534–37. http://dx.doi.org/10.1039/c6cc06897a.

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A novel approach toward quaternary carbon centered cyclobutanes through Pd(ii)-catalyzed sequential intramolecular methylene C–H alkylation and intermolecular methine C–H bond arylation, alkenylation, alkylation, alkynylation, allylation, benzylation or alkoxylation is described.

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Xiong, Tao, Qian Zhang, and Qian Zhang. "Transition-Metal-Catalyzed Alkylation of Polyfluoroarenes through C–F Bond Cleavage." Synlett 32, no. 14 (2021): 1379–84. http://dx.doi.org/10.1055/a-1479-8264.

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AbstractThe polyfluoroarenes are a subgroup of organofluorines that are widely utilized in both medicinal chemistry and materials science. We briefly summarize recent advances in the synthesis of these important compounds, with particular attention to our recent CuH-catalyzed defluorinative alkylation of polyfluoroarenes with alkenes in a highly site-selective C–F bond-cleavage fashion.1 Introduction2 Transition-Metal-Catalyzed Alkylation through Selective C–F Bond Cleavage3 CuH-Catalyzed Defluorinative Alkylation of Polyfluoroarenes with Alkenes4 Summary and Outlook

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Wu, Jie, Dejiang Huang, Yuannian Zhang, and Xin Yang. "Aerobic C–H Functionalization Using Pyrenedione as the Photocatalyst." Synthesis 52, no. 17 (2020): 2512–20. http://dx.doi.org/10.1055/s-0040-1707135.

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We disclose a visible-light-promoted aerobic alkylation of activated C(sp3)–H bonds using pyrenedione (PYD) as the photocatalyst. Direct C–H bond alkylation of tetrahydrofuran with alkylidenemalononitriles is accomplished in over 90% yield in the presence of 5 mol% of PYD and 18 W blue LED light under ambient conditions. The substrate scope is extended to ethers, thioethers, and allylic C–H bonds in reactions with various electrophilic Michael acceptors. The catalytic turnover process is facilitated by oxygen. Our work represents the first example of using PYD as a photocatalyst to promote C(s

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Dissertations / Theses on the topic "C-alkylation"

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Tirler, Carina. "Carboxylate-Assisted Ruthenium(II)-Catalyzed C-H Alkylation and Alkenylation." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://hdl.handle.net/11858/00-1735-0000-0023-9666-0.

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Crisenza, Giacomo Ercole Martino. "Strategies for selective C-H alkylation and alkenylation of arenes." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730852.

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Okumura, Shogo. "Studies on Site-selective C-H Alkylation of Arenes with Alkenes." Kyoto University, 2019. http://hdl.handle.net/2433/242514.

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Bozec, Ogor Sylvie. "Les triflamides : intermédiaires dans la c-alkylation d'amines secondaires : application aux tétraazamacrocycles." Brest, 1995. http://www.theses.fr/1995BRES2019.

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L'objectif de notre etude consistait a elaborer une nouvelle voie d'acces aux tetraazamacrocycles c-fonctionnalises. Pour cela, nous avons applique les methodes classiques de c-alkylation en alpha d'amines secondaires par les nitrosamines ou par le diiodure de samarium ; ces procedes se sont averes inefficaces pour obtenir des tetramines cycliques c-substituees. Nous nous sommes alors interesses a l'etude de la reactivite des triflamides vis a vis d'organolithiens pour mettre au point une nouvelle methode d'alpha c-fonctionnalisation d'amines secondaires. Nous decrivons ensuite les premieres a

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Tremblay, François. "Alkylation réductrice d'azotures par des alkylboranes et synthèse totale de la (+)-pumiliotoxine C." Mémoire, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/4808.

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Dans le présent mémoire, les études de la réaction d'alkylation réductrice d'azotures, avec des alkylboranes seront décrites. La particularité des azotures est qu'ils ont été obtenus par réaction de Mitsunobu et de réarrangement sigmatropique [3,3] en tandem sur les alcools obtenus à partir de l'auxiliaire (-)- p -menthane-3-carboxaldéhyde. Les paramètres optimaux ont été mesurés pour cette réaction, les limitations ont été déterminées et les différents produits obtenus dans ces conditions ont été identifiés. Suite à cette étude il semble que l'alkylation réductrice intermoléculaire d'azotures

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Perez, Vincent. "Synthèses sélectives d’isoxazolines et isoxazoles phosphonates : compétition de C- vs. O-alkylation et cycloadditions d’ynamido-phosphonates." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS363.

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En raison de la vaste gamme d'activités biologiques qu'ils possèdent, les aminophosphonates cycliques ont attiré l’attention des chimistes et des biologistes. La synthèse d’hétérocycles substitués par un atome de phosphore a largement été rapportée dans la littérature. Dans ce contexte, le premier défi a été de proposer une nouvelle voie d'accès au motif 5-phosphono-isoxazoline. Une méthodologie a été développée, reposant sur la formation de N-oxydes d’isoxazolines par réaction de O-alkylation d’un ion nitronate sur un composé α-substitué vinylphosphonate, suivie d’une réduction pour former le

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Lackner, Sebastian. "Nickel-Catalyzed Secondary Alkylations and Fluoroalkylations via C–H Activation." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://hdl.handle.net/11858/00-1735-0000-0028-87C8-1.

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Wiest, Johannes Markus [Verfasser]. "Synthesis of Pyrroles and their Application in C-H Alkylation Chemistry / Johannes Markus Wiest." München : Verlag Dr. Hut, 2016. http://d-nb.info/112252482X/34.

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Hofmann, Nora. "Carboxylate-Assisted Ruthenium-Catalyzed C-H Bond meta-Alkylations and Oxidative Annulations." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://hdl.handle.net/11858/00-1735-0000-0014-D4A4-1.

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Brown, Michael Kevin. "CU-catalyzed enantioselective conjugate addition of organometal reagents to unsaturated carbonyls : an enantioselective total synthesis of clavirolide C." Thesis, Boston College, 2008. http://hdl.handle.net/2345/964.

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Book chapters on the topic "C-alkylation"

1

Obora, Yasushi. "C-Alkylation by Hydrogen Autotransfer Reactions." In Topics in Current Chemistry Collections. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43051-5_6.

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Jean-Gérard, Ludivine, Rodolphe Jazzar, and Olivier Baudoin. "CH Bond Alkylation (Including Hydroarylation of Alkenes)." In Metal-Catalyzed Cross-Coupling Reactions and More. Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527655588.ch19.

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Vismara, E., F. Minisci, and F. Fontana. "New Procedures of Homolytic Alkylation of Heteroaromatic Bases: Synthesis of C-Nucleosides." In Organic Free Radicals. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73963-7_112.

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Bruneau, Christian, and Pierre H. Dixneuf. "Ruthenium(II)-Catalysed Functionalisation of C–H Bonds with Alkenes: Alkenylation versus Alkylation." In C-H Bond Activation and Catalytic Functionalization I. Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_134.

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Bruneau, Christian, and Pierre H. Dixneuf. "Erratum to: Ruthenium(II)-Catalysed Functionalisation of C–H Bonds with Alkenes: Alkenylation versus Alkylation." In C-H Bond Activation and Catalytic Functionalization I. Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_150.

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Rayner, C. M., and M. A. Graham. "C-Alkylation." In Fused Five-Membered Hetarenes with One Heteroatom. Georg Thieme Verlag KG, 2001. http://dx.doi.org/10.1055/sos-sd-010-00234.

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Curtis, A. D. M. "C-Alkylation." In Five-Membered Hetarenes with Three or More Heteroatoms. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-013-00909.

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Black, D. StC. "C-Alkylation." In Fully Unsaturated Small-Ring Heterocycles and Monocyclic Five-Membered Hetarenes with One Heteroatom. Georg Thieme Verlag KG, 2001. http://dx.doi.org/10.1055/sos-sd-009-00631.

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von Angerer, S. "C-Alkylation." In Science of Synthesis Knowledge Updates KU 2011/1. Georg Thieme Verlag KG, 2011. http://dx.doi.org/10.1055/sos-sd-116-00324.

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von Angerer, S. "C-Alkylation." In Six-Membered Hetarenes with Two Unlike or More than Two Heteroatoms and Fully Unsaturated Larger-Ring Heterocycles. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-017-00831.

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Conference papers on the topic "C-alkylation"

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Forsén, Olof, Jari Aromaa, Mervi Somervuori, and Markku Tavi. "Materials Performance in HF-Alkylation Units." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95342.

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Abstract Materials selection in HF-alkylation units is mostly based on long time experience. The most widely used material in the alkylation units is standard carbon steel, because it is capable to form a thick protective FeF2 layer in concentrated or anhydrous hydrofluoric acid. The corrosion resistance decreases, when the acid is dilute (less than 64% HF) or the temperature is above 160 °F (70 °C). The composition and metallurgical state are also suspected to affect the corrosion resistance of carbon steel. The effect of composition appears more complicated than believed, especially the A-10

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Lin, Huang, and Hongbo Cong. "Importance of HF Acid Concentration on the Effect of Residual Elements." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-13428.

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Abstract Past HF alkylation operation experience and several industry research projects have reported that the carbon steel corrosion rate in HF acid is strongly affected by its composition, namely the content of Cu, Ni, Cr (residual elements) and C. Literature review and more thorough electrochemical analysis indicate that the effect of residual elements (RE) on HF acid corrosion strongly depends on the HF acid concentration. In this paper, the local HF acid concentration at a refinery HF alkylation unit was studied and analyzed. HF-H2O binary phase diagram at different pressures were develop

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Helle, Henk P. E. "A Proposed Mechanism for Corrosion of C-Steel in Trace HF-acid and the Effect of Residual Elements." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05560.

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Abstract The deleterious effect of the ‘residual elements’ Cu, Ni and Cr (RE) on the corrosion resistance of C-steel against hydrofluoric acid (HF), though unexplained, has been demonstrated convincingly by many failure cases in the HF-alkylation industry. The effect of RE, however, is not consistent. In some failure cases RE was low or absent, in some non-failures RE was high. In anhydrous hydrofluoric acid or plant acid RE does not appear to have any effect at all. Seamless pipe and tube could suffer severe internal corrosion until paper-thin walls remained, flange faces would suffer corrosi

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Kus, Slawomir, Peter F. Ellis, Sridhar Srinivasan, and Mahmoud Qreis. "Behavior of Steels and Alloys in Concentrated Sulfuric Acid under Different Flow Regimes - New Perspectives." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07610.

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Abstract Storage and handling systems for concentrated (90-98%) sulfuric acid are traditionally designed from carbon steel. However, recent industry practices show an increased propensity for utilization of highly-alloyed stainless steels and nickel based alloys, primarily stemming from the need to overcome known limitations of carbon steel related to its susceptibility to erosion-corrosion at velocities above approximately 0.9 m/s. The austenitic stainless steels UNS(1) S31600/03 and nickel alloy UNS N08020 are usually used as the “first choice” materials due to their commonly accepted, high

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Chirinos, G., S. Turgoose, and R. C. Newman. "Effects of Residual Elements on the Corrosion Resistance of Steels in HF." In CORROSION 1997. NACE International, 1997. https://doi.org/10.5006/c1997-97513.

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Abstract The effects of Cu, Ni and Cr alloying on HF corrosion were studied using special low-carbon alloys, and the results compared with two commercial steels that had shown different resistance in HF alkylation service. Three HF concentrations (60%, 90% and 98.4%) and two temperatures (room temperature and 90°C) were used. The electrochemical techniques were impedance spectroscopy, polarization curves and zero-resistance ammetiy of coupled electrodes. Long-term immersion tests in 60% HF were used to study the fluoride scales in cross-section. In deoxygenated 98.4% acid, the most notable res

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Soundararajan, Sudharsanan. "Failure Analysis of High Temperature Plate Heat Exchangers in Converter Section of Sulfuric Acid Regeneration [SAR] Unit." In CONFERENCE 2023. AMPP, 2023. https://doi.org/10.5006/c2023-19420.

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Abstract In Sulfuric Acid Regeneration [SAR] Unit, the spent sulfuric acid [H2SO4] from Alkylation Unit is regenerated to produce a clean Sulfuric Acid of 99.2%. As part of regeneration process the spent acid is decomposed to sulfur dioxide (SO2) at 1066°C [1950°F]. After cooling and purification the conversion of SO2 to Sulfur trioxide (SO3) occurs with the presence of Oxygen in the Convertor section of the unit. The conversion process is an exothermic reaction in nature and the converted Hot gas is used to heat the inlet cold gas to the 1st Converter in Hot Gas-Gas Plate type heat exchanger.

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Hashim, H. H., and W. L. Valerioti. "Effect of Residual Copper, Nickel, and Chromium on the Corrosion Resistance of Carbon Steel in Hydrofluoric Acid Alkylation Service." In CORROSION 1993. NACE International, 1993. https://doi.org/10.5006/c1993-93623.

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ABSTRACT Carbon steel is the main construction material in HYDROFLUORIC ACID (HF) alkylation units. Carbon steel has good corrosion resistance to anhydrous HF (AHF) below 160°F (71°C). The corrosion resistance is due to the formation of an inorganic iron fluoride scale on the carbon steel surface that protects the steel from further corrosion. The presence of an adherent and continuous scale is essential in keeping the corrosion rate at a minimum. Several cases of accelerated and selective corrosion of piping components operating within prescribed process conditions were experienced. The corro

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Divi, Suresh, and Sri Krishna Chimbli. "Electrochemical Corrosion Behavior of Carbon Steel with and without High Residual Elements." In CORROSION 2020. NACE International, 2020. https://doi.org/10.5006/c2020-14245.

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Abstract Residual elements (RE) in carbon steel, not specifically included in the specified steel, appear to influence the corrosion rate under certain conditions, especially in services involving hydrofluoric acid (HF). The relative proportions of RE, specifically %C, %Ni, %Cu, and %Cr in carbon steel base and weld metals used in refineries, especially in alkylation processes with HF as the catalyst, significantly impact corrosion behavior. Studies described in the literature show corrosion damage with high RE (Cu + Ni + Cr &gt;0.20) components as compared to low RE (Cu + Ni + Cr &lt;

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Peñuela, Leomar, and Jose Chirinos. "Carbon Steel Flanges and Welds Evaluation on HF-Alkylation Unit." In CORROSION 1999. NACE International, 1999. https://doi.org/10.5006/c1999-99381.

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Abstract In 1995, there were two failures in the 20.000 BPD HF Alky unit at the Amuay Refinery causing a shutdown of the unit. The failures occurred in one flange and one weld in the depropanizer charge carbon steel pipe, containing propane, isobutane and anhydrous hydrofluoric acid at 190 F (88 C) and 321 psig (22.5 Kg/cm2). Examination showed severe uniform corrosion at the inside surface of the flange while the adjacent elbow showed minimal corrosion loss. The other failure showed preferential attack in the weld without corrosion loss in the pipe components. A complete evaluation of the Alk

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Davison, Evan, Jessica Otto, Sandeep Kumar, and Randy Maglinao. "Production of Branched Esters via Continuous Alkylation of Fatty Acid Methyl Esters over Montmorillonite and h-zsm5 Catalysts." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/ezak5028.

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Abstract: Lignocellulosic and waste from the food industry offers a sustainable way to produce alternative transportation fuel and provide fiber and biomaterial. Thermochemical processes can depolymerize lignin into its phenolic monomers which can be upgraded to aromatic hydrocarbons. Fatty acids from food wastes have functional groups to accommodate selective synthesis of chemicals. These characteristics could be utilized as sustainable high-value additive products for fuels and lubricating oils. In the present study, an effective lubricity additive was synthesized via continuous alkylation o

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