Bibliografie tematiche / Chloride abstraction

Letteratura scientifica selezionata sul tema "Chloride abstraction"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Chloride abstraction"

1

Menkir, Mengistu Gemech, e Shyi-Long Lee. "Mechanisms of metal-catalyzed cycloisomerizations of o-propargylbiaryls and o-allenylbiaryls to phenanthrenes: a DFT study". Catalysis Science & Technology 7, n. 24 (2017): 6026–41. http://dx.doi.org/10.1039/c7cy01899a.

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DFT calculation results reveal that InCl3-catalyzed cycloisomerization of o-propargylbiphenyl proceeds via 6-exo cyclization followed by intermolecular chloride-assisted H-abstraction/proto-demetalation and intramolecular chloride-assisted H-abstraction/proto-demetalation to afford a phenanthrene skeleton.
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2

Schr�del, Hans-Peter, Alfred Schmidpeter e Heinrich N�th. "Chlorophosphaethenyl phosphonium ions by chloride abstraction from dichlorophosphanyl ylides". Heteroatom Chemistry 7, n. 5 (1996): 355–58. http://dx.doi.org/10.1002/(sici)1098-1071(199610)7:5<355::aid-hc11>3.0.co;2-p.

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3

Conrad, Eamonn, Neil Burford, Robert McDonald e Michael J. Ferguson. "Phosphinoarsonium and Diarsonium Cations from Chloride-Abstraction-Induced Pnictogen Coupling". Inorganic Chemistry 47, n. 8 (aprile 2008): 2952–54. http://dx.doi.org/10.1021/ic800287e.

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4

Balcar, Hynek, Alena Dosedlová e Bohumír Matyska. "Interactions of tungsten hexachloride with esters of carboxylic acids". Collection of Czechoslovak Chemical Communications 51, n. 4 (1986): 753–62. http://dx.doi.org/10.1135/cccc19860753.

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The interactions of tungsten chlorides and oxychlorides with methyl 10-undecenoate, methyl palmitate and methyl acetate, respectively, have been investigated by UV-VIS, IR and EPR spectroscopic methods. The primary complex formed by coordination of the carbonyl group to WCl6 is converted successively to an analogical, very stable complex WOCl4.ester under the simultaneous formation of acyl chloride and methyl chloride. In the case of methyl undecenoate, the coordination reaction is accompanied by a partial reduction of WCl6 to WCl5. The latter reacts with the ester in excess to give a complex characterized by a broad EPR single line at g = 1.767 (ΔH = 7.8 mT). At higher ester-to-tungsten molar ratios, this complex undergoes deeper reduction to products containing tungsten in a lower oxidation state, and competitively, a parallel oxygen abstraction reaction yielding WOCl3, acyl chloride and methyl chloride. The participation of these reactions in the formation of active WCl6-based catalysts for methathesis of unsaturated esters is discussed.
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5

Bhasin, Menka, Indu Sharma e P. D. Sharma. "Kinetics and Mechanism of Ruthenium(III) Chloride Catalyzed Oxidation of Propane-1,3-diol by Thallium(III) in Acid Perchlorate Medium". Journal of Chemical Research 23, n. 1 (gennaio 1999): 1. http://dx.doi.org/10.1177/174751989902300106.

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6

Schleicher, David, Alexander Tronnier, Hendrik Leopold, Horst Borrmann e Thomas Strassner. "Unusual dimer formation of cyclometalated ruthenium NHC p-cymene complexes". Dalton Transactions 45, n. 8 (2016): 3260–63. http://dx.doi.org/10.1039/c6dt00100a.

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7

Grieco, Gabriele, Olivier Blacque e Heinz Berke. "A facile synthetic route to benzimidazolium salts bearing bulky aromatic N-substituents". Beilstein Journal of Organic Chemistry 11 (17 settembre 2015): 1656–66. http://dx.doi.org/10.3762/bjoc.11.182.

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An atom-economic synthetic route to benzimidazolium salts is presented. The annulated polycyclic systems: 1,3-bis(2,4,6-trimethylphenyl)-1H-benzo[d]imidazol-3-ium chloride (1-Cl), 1,3-bis(2,6-diisopropylphenyl)-1H-benzo[d]imidazol-3-ium chloride (2-Cl), 1,3-diphenyl-1H-benzo[d]imidazol-3-ium chloride (3-Cl), and 1,3-di(pyridin-2-yl)-1H-benzo[d]imidazol-3-ium chloride (4-Cl) were prepared in a two-step synthesis avoiding chromatographic work-up. In the key step triethyl orthoformate is reacted with the correspondingN1,N2-diarylbenzene-1,2-diamines and then further transformed in situ, by alkoxy abstraction using trimethylsilyl chloride (TMSCl), and concomitant imidazole ring closure.
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8

Novák, Miroslav, Jan Turek, Yaraslava Milasheuskaya, Zdeňka Růžičková, Štěpán Podzimek e Roman Jambor. "N-Donor stabilized tin(ii) cations as efficient ROP catalysts for the synthesis of linear and star-shaped PLAs via the activated monomer mechanism". Dalton Transactions 50, n. 44 (2021): 16039–52. http://dx.doi.org/10.1039/d1dt02658e.

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Abstract (sommario):
N-donor stabilized tin(ii) cations were synthesized by a chloride abstraction from neutral complexes or by an auto-ionization concept. Prepared tin(ii) cations are universal catalysts for the production of linear and star-shaped PLAs via ROP.
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9

Beach, Nicholas J., Hilary A. Jenkins e Gregory J. Spivak. "Electrophilic Attack on [Cp*Cl(PPh3)Ru(CCHR)]: Carbyne Formation vs Chloride Abstraction". Organometallics 22, n. 25 (dicembre 2003): 5179–81. http://dx.doi.org/10.1021/om030559i.

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10

Laganà, A., e L. Ciccarelli. "Abstraction and exchange contributions to the rate constant of muonium+hydrogen chloride reaction". Hyperfine Interactions 36, n. 1 (febbraio 1987): 59–63. http://dx.doi.org/10.1007/bf02396848.

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Più fonti

Tesi sul tema "Chloride abstraction"

1

Tronoff, Ashley. "Chloride abstraction from ruthenium alkyl bis-diphosphine dichlorides". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/2801.

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Abstract (sommario):
Despite their early discovery, relatively few classes of ruthenium dinitrogen complexes are known. This work describes the successful coordination of dinitrogen to the electron-rich alkylphosphine cores [RuCl(dmpe)2]+ and [RuCl(depe)2]+ by chloride abstraction from both the cis and trans dichloro derivatives. One such complex, trans-[RuCl(N2)(dmpe)2](BArF24), possesses the most activated ruthenium νNN reported to date. A variety of chloride abstraction agents were tested on the cis and trans isomers of [RuCl2(P-P)2] (P-P = dmpe, depe) with the choice of abstracting agent, anion and solvent all found to significantly affect the outcome. Reaction with silver triflate and trimethylsilyl triflate was found to give dichlororuthenium(III) products, which could be readily reduced to the ruthenium(II) starting materials with common reducing agents, as well as by alcohols and hydrazine. The use of thallium triflate avoided oxidation and led to the formation of the crystallographically characterised polymeric incorporation product, [{trans-[RuCl2(dmpe)2]•Tl(OTf)}n] from trans-[RuCl2(dmpe)2] and the interesting chloride-bridged ruthenium dimer cis-[{Ru(depe)2}2(μ-Cl)2](OTf)2 from trans-[RuCl2(depe)2]. Anion exchange of the complex [{trans-[RuCl2(dmpe)2]•Tl(OTf)}n] with the non-coordinating anion tetrakis(3,5-bis(trifluoromethyl)phenyl)borate resulted in removal of thallium from the system and coordination of dinitrogen to give trans-[RuCl(N2)(dmpe)2](BArF24). Cis-[{Ru(depe)2}2(μ-Cl)2](OTf)2 was found to readily react with a variety of small ligands and gave products such as cis-[RuCl(CO)(depe)2](OTf), cis-[RuCl(NCMe)(depe)2](OTf), cis-[RuCl(CNtBu)(depe)2](OTf), cis-[RuCl(NH3)(depe)2](OTf), cis-[RuCl(N3)(depe)2], and trans-[RuCl(η2-H2)(depe)2](OTf). A preliminary X-ray single crystal structure analysis was conducted on the complex cis-[RuCl(CNtBu)(depe)2](OTf). The thallium(I) salt Tl(BArF24) was found to be an efficient chloride abstraction agent under mild conditions. Reactions with cis- and trans-[RuCl2(depe)2] and cis-[RuCl2(dmpe)2] furnished dinitrogen complexes of the form cis-[{RuCl(P-P)2}2(μ-N2)](BArF24)2, whilst reaction of trans-[RuCl2(dmpe)2] with Tl(BArF24) led to the stable five-coordinate complex trans-[RuCl(dmpe)2](BArF24). Vapour diffusion techniques applied to a solution of cis-[{RuCl(depe)2}2(μ-N2)](BArF24)2 gave rise to crystals of trans-[RuCl(N2)(depe)2](BArF24), on which preliminary X-ray molecular structure analysis was performed. Reactions of both cis-[{Ru(depe)2}2(μ-Cl)2](OTf)2 and trans-[RuCl2(dmpe)2] with high pressure (140 psi) dinitrogen at 140 150°C in methanol or tetrahydrofuran resulted in solvent carbonyl abstraction to afford trans-[RuCl(CO)(depe)2](OTf) and trans-[RuCl(CO)(dmpe)2](Cl) from the depe and dmpe complexes respectively. The molecular structure of trans-[RuCl(CO)(dmpe)2](Cl) was determined via single crystal X-ray structure analysis.
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2

Tronoff, Ashley. "Chloride abstraction from ruthenium alkyl bis-diphosphine dichlorides". Science, 2008. http://hdl.handle.net/2123/2801.

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Abstract (sommario):
Doctor of Philisophy (PhD)
Despite their early discovery, relatively few classes of ruthenium dinitrogen complexes are known. This work describes the successful coordination of dinitrogen to the electron-rich alkylphosphine cores [RuCl(dmpe)2]+ and [RuCl(depe)2]+ by chloride abstraction from both the cis and trans dichloro derivatives. One such complex, trans-[RuCl(N2)(dmpe)2](BArF24), possesses the most activated ruthenium νNN reported to date. A variety of chloride abstraction agents were tested on the cis and trans isomers of [RuCl2(P-P)2] (P-P = dmpe, depe) with the choice of abstracting agent, anion and solvent all found to significantly affect the outcome. Reaction with silver triflate and trimethylsilyl triflate was found to give dichlororuthenium(III) products, which could be readily reduced to the ruthenium(II) starting materials with common reducing agents, as well as by alcohols and hydrazine. The use of thallium triflate avoided oxidation and led to the formation of the crystallographically characterised polymeric incorporation product, [{trans-[RuCl2(dmpe)2]•Tl(OTf)}n] from trans-[RuCl2(dmpe)2] and the interesting chloride-bridged ruthenium dimer cis-[{Ru(depe)2}2(μ-Cl)2](OTf)2 from trans-[RuCl2(depe)2]. Anion exchange of the complex [{trans-[RuCl2(dmpe)2]•Tl(OTf)}n] with the non-coordinating anion tetrakis(3,5-bis(trifluoromethyl)phenyl)borate resulted in removal of thallium from the system and coordination of dinitrogen to give trans-[RuCl(N2)(dmpe)2](BArF24). Cis-[{Ru(depe)2}2(μ-Cl)2](OTf)2 was found to readily react with a variety of small ligands and gave products such as cis-[RuCl(CO)(depe)2](OTf), cis-[RuCl(NCMe)(depe)2](OTf), cis-[RuCl(CNtBu)(depe)2](OTf), cis-[RuCl(NH3)(depe)2](OTf), cis-[RuCl(N3)(depe)2], and trans-[RuCl(η2-H2)(depe)2](OTf). A preliminary X-ray single crystal structure analysis was conducted on the complex cis-[RuCl(CNtBu)(depe)2](OTf). The thallium(I) salt Tl(BArF24) was found to be an efficient chloride abstraction agent under mild conditions. Reactions with cis- and trans-[RuCl2(depe)2] and cis-[RuCl2(dmpe)2] furnished dinitrogen complexes of the form cis-[{RuCl(P-P)2}2(μ-N2)](BArF24)2, whilst reaction of trans-[RuCl2(dmpe)2] with Tl(BArF24) led to the stable five-coordinate complex trans-[RuCl(dmpe)2](BArF24). Vapour diffusion techniques applied to a solution of cis-[{RuCl(depe)2}2(μ-N2)](BArF24)2 gave rise to crystals of trans-[RuCl(N2)(depe)2](BArF24), on which preliminary X-ray molecular structure analysis was performed. Reactions of both cis-[{Ru(depe)2}2(μ-Cl)2](OTf)2 and trans-[RuCl2(dmpe)2] with high pressure (140 psi) dinitrogen at 140 150°C in methanol or tetrahydrofuran resulted in solvent carbonyl abstraction to afford trans-[RuCl(CO)(depe)2](OTf) and trans-[RuCl(CO)(dmpe)2](Cl) from the depe and dmpe complexes respectively. The molecular structure of trans-[RuCl(CO)(dmpe)2](Cl) was determined via single crystal X-ray structure analysis.
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3

Huskey, Dow T. "A temperature and pressure dependent kinetics study of the gas-phase reactions of bromine (2P3/2) and chlorine (2PJ) atoms with methylvinyl ketone". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24734.

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4

Krosley, Kevin W. "Part I. The identity of the chain propagating radical(s) in photoinitiated benzylic bromination by bromotrichloromethane ; Part II. Chlorine atom abstraction from α- and β-chloroepoxides by the triphenyltin radical". Thesis, 1991. http://hdl.handle.net/1957/37160.

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Libri sul tema "Chloride abstraction"

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Krosley, Kevin W. Part I. The identity of the chain propagating radical(s) in photoinitiated benzylic bromination by bromotrichloromethane ; Part II. Chlorine atom abstraction from Ü- and Ý-chloroepoxides by the triphenyltin radical. 1991.

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Capitoli di libri sul tema "Chloride abstraction"

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Yu, Lei, Tianyuan Zhao e Zhi Wang. "Study on the Properties of Concrete with Different Admixtures in Acid Corrosive Environment". In Advances in Frontier Research on Engineering Structures, 231–39. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_21.

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Abstract (sommario):
AbstractTo study the deteriorating law and find a proper admixture to enhance the durability of the concrete in the acid corrosion environment, the corrosion and deterioration of concrete with different types and proportions of admixtures were studied. The appearance morphology, strength, chloride penetration depth, and porosity of ordinary concrete and concrete with different types of admixtures under water curing and corrosion solution erosion were compared. The results show that in terms of improving the corrosion resistance of concrete, the single-mixed mineral powder shows excellent performance. The addition of fly ash significantly increases the content of 10–100 nm pores, and the strength is low at an early age, but the strong growth is limited at the later stage.
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2

Slootweg, J. C., e K. Lammertsma. "Chloride Abstraction". In Organophosphorus Compounds (incl. RO-P and RN-P), 1. Georg Thieme Verlag KG, 2009. http://dx.doi.org/10.1055/sos-sd-042-00023.

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3

Bansal, R. K., N. Gupta e S. J. Collier. "Synthesis by Chloride Abstraction". In Five-Membered Hetarenes with Three or More Heteroatoms, 1. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-013-00932.

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4

Bansal, R. K., e Neelima Gupta. "Aromatization by Chloride Abstraction". In Five-Membered Hetarenes with Three or More Heteroatoms, 1. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-013-01074.

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5

Collier, S. J. "Synthesis by Chloride Abstraction". In Five-Membered Hetarenes with Three or More Heteroatoms, 1. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-013-01150.

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6

Taber, Douglass. "The Castle Synthesis of (-)-Acutumine". In Organic Synthesis. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199764549.003.0104.

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Abstract (sommario):
The complex tetracyclic alkaloid (-)-acutumine 3, isolated from the Asian vine Menispermum dauricum, shows selective T-cell toxicity. The two adjacent cyclic all-carbon quaternary centers of 3 offered a particular challenge. Steven L. Castle of Brigham Young University solved (J. Am. Chem. Soc. 2009, 131, 6674) this problem by effecting net enantioselective conjugate allylation of the enantiomerically pure substrate 1 to give 2 with high diastereocontrol. The starting coupling partners ( Organic Lett . 2006, 8, 3757; Organic Lett. 2007, 9, 4033) for the synthesis were the Weinreb amide 4, prepared over several steps from 2,3- dimethoxyphenol, and the diastereomerically- and enantiomerically-pure cyclopentenyl iodide 5, prepared by singlet oxygenation of cyclopentadiene followed by enzymatic hydrolysis. Transmetalation of 5 by the Knochel protocol, addition of the resulting organometallic to 4 and enantioselective (and therefore diastereoselective) reduction of the resulting ketone delivered the alcohol 6. Methods for installing cyclic halogenated stereogenic centers are not well developed. Exposure of the allylic alcohol to mesyl chloride gave the chloride 7 with inversion of absolute configuration. Remarkably, this chlorinated center was carried through the rest of the synthesis without being disturbed. A central step in the synthesis of 3 was the spirocyclization of 7 to 8. Initially, iodine atom abstraction generated the aryl radical. The diastereoselectivity of the radical addition to the cyclopentene was set by the adjacent silyloxy group. The α-keto radical so generated reacted with the Et3Al to give a species that was oxidized by the oxaziridine to the α-keto alcohol, again with remarkable diastereocontrol. Conjugate addition to the cyclohexenone 1 failed, so an alternative strategy was developed, diastereoselective 1,2-allylation of the ketone followed by oxy-Cope rearrangement. The stereogenic centers of 1 are remote from the cyclohexenone carbonyl, so could not be used to control the facial selectivity of the addition. Fortunately, the stoichiometric enantiomerically-pure Nakamura reagent delivered the allyl group preferentially to one face of the ketone 1, to give 9. The subsequent sigmatropic rearrangement to establish the very congested second quaternary center of 2 then proceeded with remarkable facility, at 0°C for one hour.
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Atti di convegni sul tema "Chloride abstraction"

1

Hudgens, Jeffrey W., Jeffrey L. Brum, Russell D. Johnson e David V. Dearden. "Structure Matters: Detection of Difluoromethyl and Difluoroethyl Radicals by Resonance Enhanced Multiphoton Ionization Spectroscopy". In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.fa.4.

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The link between anthropogenic chlorofluorocarbon (CFC) release and stratospheric ozone depletion now appears well established. Several fluorinated methanes and ethanes are among the hydrofluorocarbons (HFCs) currently being investigated as replacements for the chlorine containing congeners that have traditionally found use as refrigerants, fire extinguishers, and in more specialized applications. In recent years significant effort has focused on the tropospheric degradation pathways available to HFCs initiated by H atom abstraction by a hydroxyl radical. For alternate CFC's the generic initiating reactions are: Although an impressive amount of mechanistic and kinetic information concerning these pathways has been gathered recently, much remains to be learned about the fluorinated methyl and ethyl radicals which represent the first intermediates of the degradation process.
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