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Journal articles on the topic 'Reaktive Intermediate'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Braunschweig, Holger. "Heron 8: Reaktive Intermediate und ungewöhnliche Moleküle." Nachrichten aus der Chemie 67, no. 10 (October 2019): 82. http://dx.doi.org/10.1002/nadc.20194091603.

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2

Rademann, Jörg, Joachim Smerdka, Günther Jung, Philipp Grosche, and Dietmar Schmid. "Alkylierende Polymere: freigesetzte Carbenium-Ionen als vielseitige reaktive Intermediate in der Polymer-unterstützten Synthese in Lösung." Angewandte Chemie 113, no. 2 (January 19, 2001): 390–93. http://dx.doi.org/10.1002/1521-3757(20010119)113:2<390::aid-ange390>3.0.co;2-j.

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3

Hsiao, Chien-Chi, Sadiya Raja, Hsuan-Hung Liao, Iuliana Atodiresei, and Magnus Rueping. "Ortho-Chinonmethide als reaktive Intermediate in asymmetrischen Brønsted-Säure-katalysierten Cycloadditionen mit Alkenen mittels exklusiver Aktivierung des Elektrophils." Angewandte Chemie 127, no. 19 (March 17, 2015): 5854–57. http://dx.doi.org/10.1002/ange.201409850.

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4

Grobe, Joseph, Gudrun Lange, and Duc Le Van. "Reaktive E=C(p – p) π-Systeme, XXI [1] / Reactive E=C(p – p)π-Systems, XXI [1]." Zeitschrift für Naturforschung B 45, no. 3 (March 1, 1990): 299–307. http://dx.doi.org/10.1515/znb-1990-0305.

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1λ3,3λ3-Diphosphanes of the type R2PCF2P(H)CF3 [R = Me (3), Et (5), Cyclohexyl (6), Ph (7)] are formed in acceptable yields (40-75%) by reacting perfluoro-2-phosphapropene F3CP=CF2 (1) with the corresponding secondary phosphanes R2PH. By reaction with sulfur, compounds 3, 5 and 7 selectively yield the corresponding monosulfur derivates R2P(S)CF2P(H)CF3 [R = Me (8), Et (9), Ph (10)]. Treatment of 3 or 7 with dimethylamine (molar ratio 1/2) leads via HF elimination and addition of Me2NH to the aminophosphanes R2PCHFP(NMe2)CF3 [R = Me (11), Ph (12)]. In a similar procedure HF has been eliminated from 3 by 1,4-diazabicyclo[2.2.2]octane (DABCO), and on addition of methanol or ethanol to the 1,3-diphosphapropene intermediate, the alkoxy compounds Me2PCHFP(OR)CF3 [R = Me (13), Et (14)] have been obtained.

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5

Carpenter, Barry K. "Dynamisches Verhalten von organischen reaktiven Intermediaten." Angewandte Chemie 110, no. 24 (December 17, 1998): 3532–43. http://dx.doi.org/10.1002/(sici)1521-3757(19981217)110:24<3532::aid-ange3532>3.0.co;2-4.

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6

Wanner, Klaus Th. "Tetrahydro-3-pyranon: Regioselektivität bei der Bildung reaktiver Intermediate." Archiv der Pharmazie 321, no. 2 (1988): 81–83. http://dx.doi.org/10.1002/ardp.19883210208.

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7

Tidwell, Thomas T. "Ein Jahrhundert Ketene (1905-2005): die Entdeckung einer vielseitigen Klasse reaktiver Intermediate." Angewandte Chemie 117, no. 36 (September 12, 2005): 5926–33. http://dx.doi.org/10.1002/ange.200500098.

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8

Limberg, Christian, Ralf Köppe, and Hansgeorg Schnöckel. "Matrixisolierung und Charakterisierung eines reaktiven Intermediates bei der Olefinoxidation mit Chromylchlorid." Angewandte Chemie 110, no. 4 (February 16, 1998): 512–15. http://dx.doi.org/10.1002/(sici)1521-3757(19980216)110:4<512::aid-ange512>3.0.co;2-z.

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9

Fontain, Eric, Johannes Bauer, and Ivar Ugi. "Computerunterstützte mechanistische Analyse der Streith-Reaktion mit dem Programm RAIN." Zeitschrift für Naturforschung B 42, no. 7 (July 1, 1987): 889–91. http://dx.doi.org/10.1515/znb-1987-0716.

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Abstract An improved version of the computer program RAIN (for bilaterally generating Reaction And Intermediate Networks from educts and products; FORTRAN 77, MS-DOS) is presented. Its application is illustrated by the elaboration of a network of mechanistic pathways for the Streith reaction.

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10

Steinke, Tobias, Christian Gemel, Mirza Cokoja, Manuela Winter, and Roland A. Fischer. "AlCp* als Steuerligand: C-H- und Si-H-Bindungsaktivierung am reaktiven Intermediat[Ni(AlCp*)3]." Angewandte Chemie 116, no. 17 (April 19, 2004): 2349–52. http://dx.doi.org/10.1002/ange.200353114.

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11

Tolxdorff, Catherine, Dongqi Hu, Bernhard Höferth, Hartmut Schaufele, Hans Pritzkow, and Ulrich Zenneck. "Reaktive π-Komplexe der elektronenreichen Übergangsmetalle, 11. Mitteilung/ Reactive π-Complexes of the Electron Rich Transition Metal Complexes, Part 11." Zeitschrift für Naturforschung B 46, no. 6 (June 1, 1991): 729–37. http://dx.doi.org/10.1515/znb-1991-0606.

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The highly reactive arene iron complex [(η4-toluene)(η6-toluene)iron] allows the formation of C4-units from alkynes below room temperature. By this route butadiene-, cyclobutadiene-, and ferracyclopentadiene(arene)iron complexes are accessible. Synthesis, structure and the properties of one example each are reported. Ferracyclopentadienes are potential intermediates for the catalytic cyclotrimerization of alkynes in the coordination sphere of arene iron complexes.

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12

Nüske, Hanno, Mathias Noltemeyer, and Armin de Meijere. "π-Allylpalladium-Intermediate durch Carbopalladierung von Bicyclopropyliden und ihr Abfang durch Nucleophile: eine neuartige Dreikomponenten-Reaktion." Angewandte Chemie 113, no. 18 (September 17, 2001): 3509–11. http://dx.doi.org/10.1002/1521-3757(20010917)113:18<3509::aid-ange3509>3.0.co;2-v.

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13

Fischer, Ulrich, and Gerhard Hägele. "Anomale Michaelis-Becker-Reaktion: 1-PhenyIethan-1,2,2-trisphosphonsäure und ihre Ester / Anomalous Michaelis-Becker Reaction: 1-Phenylethan-1,2,2-triphosphonic Acid and their Esters." Zeitschrift für Naturforschung B 40, no. 9 (September 1, 1985): 1152–56. http://dx.doi.org/10.1515/znb-1985-0910.

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Sodium dialkylphosphite reacts with trichlorovinylbenzene to yield in an one-batch procedure 1-phenyl-1,2,2-ethanetrisphosphonic acid hexaalkyl esters. A carbanionic intermediate of an “anomalous Michaelis-Becker reaction” is deduced. Acidolysis of esters leads to the parent trisphosphonic acids. NMR param eters of this acid are strongly influenced by protolytic equilibrium.

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14

Kant, M., and M. Meisel. "Salze von Halogenophosphors�uren XIX [1] �ber die Bildung und den Nachweis stabiler Intermediate bei der Reaktion von Fluorid mit Phosphoroxidchlorid." Zeitschrift f�r anorganische und allgemeine Chemie 620, no. 11 (November 1994): 1937–42. http://dx.doi.org/10.1002/zaac.19946201117.

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15

Grobe, Joseph, and Jürgen Szameitat. "Reaktive E=C(p—p)π-Systeme, XVI [1] Trimethylstannvlphosphane des Typs Me3SnP(R)CF3 (R = Me, Et) als Phosphaalken-Vorstufen / Reactive E=C(p-p)π-Systeme, XVI [1] Trimethylstannylphosphanes of the Type Me3SnP(R)CF3 (R = Me, Et) as Phosphaalkene Precursors." Zeitschrift für Naturforschung B 43, no. 4 (April 1, 1988): 427–37. http://dx.doi.org/10.1515/znb-1988-0408.

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AbstractStannylphosphanes of the type Me3SnP(R)CF3 [R = Me (1), Et (2)] have been prepared by a multistep synthesis (Fig. 1) starting either with F3CPI2 or with P(NEt2)3. Due to the alkyl substituents, 1 and 2 show a higher thermal stability than the analogous perfluoroalkyl compounds Me3SnP(RF)2 (RF = CF3, C2F5). Pyrolysis of 1 and 2 at 380 °C/10-3 Torr gives the new phosphaalkenes RP=CF2 (R = Me, Et) as reactive intermediates collected at -196 °C. They polymerize on the attempt to prepare diluted solutions even at very low temperatures. In case of the ethyl derivative the product (EtPCF2)x is a colourless polymer which on heating (500-600 °C) yields a mixture of dimers (EtPCF2)2 (trans-, cis-1,3- and trans-1,2-diphosphetane; ratio 73:13,5:13,5). 1 and 2 have been used as equivalents of the phosphaalkenes RP=CF2 in one-pot reactions with 2,3-dimethylbutadiene and 1,3-cyclohexadiene, respectively. The labile P=C intermediates produced at 120 °C are captured by the dienes affording the [2+4]-cycloadducts 3-6 in good yields. Oxidation with sulfur gives the corresponding phosphane sulfides 7-10 in almost quantitative yields. New compounds were characterized by spectroscopic (NMR, MS, IR) and analytical methods.

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16

Rademann, JÃ¶rg, and Michael Barth. "ULTRA-hochbeladene Harze durch Quervernetzung von linearem Polyethylenimin â Steigerung der AtomÃ¶konomie in der Polymer-unterstÃ¼tzten Chemie Wir danken der Firma Personal Chemistry GmbH, Konstanz, fÃ¼r die zeitweilige Ãberlassung eines Mikrowellen-Syntheseautomaten. J.R. bedankt sich fÃ¼r UnterstÃ¼tzung bei Prof. G. Jung und Prof. M. E. Maier, UniversitÃ¤t TÃ¼bingen, dem Strukturfonds der UniversitÃ¤t TÃ¼bingen, der DFG (Projekt âReaktive Intermediate in polymeren Gelenâ (Ra 895/2) und dem DFG-Graduiertenkolleg âChemie in Interphasenâ (Projekt 6, Rademann) von dem M.B. ein Stipendium erhÃ¤lt. Ferner danken wir Rainer Fischer, Elke Gesele, Dr. Klaus Eichele und Nicole Sessler fÃ¼r analytische und apparative UnterstÃ¼tzung." Angewandte Chemie 114, no. 16 (August 16, 2002): 3087. http://dx.doi.org/10.1002/1521-3757(20020816)114:16<3087::aid-ange3087>3.0.co;2-m.

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17

Khabiyev, A. T., and B. S. Selenova. "Palladium(II)-catalyzed Suzuki–Miyaura Reactions of Arylboronic Acid with Aryl Halide in the Presence of Aryl-Ferrocenyl-Phosphines." Eurasian Chemico-Technological Journal 16, no. 1 (December 22, 2013): 79. http://dx.doi.org/10.18321/ectj172.

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<p>This study examined investigation of catalytic activity of aryl-ferrocenyl-phosphine (2-methoxyphenyl diferrocenyl phosphine (cat. 1), 2-tert-butyloxyphenyl diferrocenyl phosphine (cat. 2), 2-methoxynaphtyl diferrocenyl phosphine (cat. 3), 1,1’-bis(diphenylphosphino) ferrocene (cat. 4), phenyl diferrocenyl phosphine (cat. 5)) ligands with palladium salts as precursors in Suzuki–Miyaura reaction. Suzuki–Miyaura reaction is one of the important cross-coupling reactions and extremely powerful in forming C–C bonds. Aryl-ferrocenyl-phosphine ligands confer unprecedented activity for these processes, allowing reactions to be performed at low catalyst levels, to prepare extreme This study examined investigation of catalytic activity of aryl-ferrocenyl-phosphine (2-methoxyphenyl diferrocenyl phosphine (cat. 1), 2-tert-butyloxyphenyl diferrocenyl phosphine (cat. 2), 2-methoxynaphtyl diferrocenyl phosphine (cat. 3), 1,1’-bis(diphenylphosphino) ferrocene (cat. 4), phenyl diferrocenyl phosphine (cat. 5)) ligands with palladium salts as precursors in Suzuki–Miyaura reaction. Suzuki–Miyaura reaction is one of the important cross-coupling reactions and extremely powerful in forming C–C bonds. Aryl-ferrocenyl-phosphine ligands confer unprecedented activity for these processes, allowing reactions to be performed at low catalyst levels, to prepare extremely hindered biaryls and to be carried out, in general, also for reactions of aryl chlorides by temperature 100 ºC and pressure 1 atm. Sterically demanding and strongly Lewis-basic ferrocene-based phosphines are water- and oxygen-resistant. The Suzuki–Miyaura reaction is also an important reaction in the ground and fine organic synthesis, in the production of drugs and intermediates. To analyze the conversion of halogen aryl compounds the <sup>1</sup>H NMR spectroscopy was used. The advantage of Suzuki–Miyaura reaction in comparison with other cross-coupling reactions (Kumada-, Heck-, Heck-Carbonylation-, Murahashi-, Sonogashira-, Negishi-, Stille-reaktion, etc.) is in the usage of low toxic, water- and oxygen-insensitive thermostable organoboron compounds. As boronic acid was used phenylboronic acid and as weak base – potassium phosphate. Catalyst, precursor and weak base were dissolved in toluene. All reactions were performed under an atmosphere of nitrogen or argon. The catalytic cycle of Suzuki–Miyaura reaction typically includes three main steps: oxidative addition of the haloaromatic to catalytic active palladium (0) species, transmetalation, and reductive elimination of the product under back formation of catalytically active species. All used catalysts showed good activity with aryl bromides and weak activity with aryl chlorides.</p>

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18

Müller, Jörn, Petra Escarpa Gaede, and Ke Qiao. "π-Olefin-Iridium-Komplexe, XXII [1]. C-H-Aktivierung von aromatischen und aliphatischen Solvensmolekülen RH bei der Reaktion von [Cp*IrCI2]2 mit Butadienmagnesium unter Bildung von [Cp*Ir(η3-C4H7)R] sowie Kristallstruktur von [Cp*Ir(η3-C4H7)C6H5] / π-Olefin Iridium Complexes, XXII [1]. C-H Activation of Aromatic and Aliphatic Solvent Molecules RH in the Reaction of [Cp*IrCl2]2 with Butadienemagnesium with Formation of [Cp*Ir(η3-C4H7)R], and Crystal Structure of [Cp*Ir(η3-C4H7)C6H5]." Zeitschrift für Naturforschung B 49, no. 12 (December 1, 1994): 1645–53. http://dx.doi.org/10.1515/znb-1994-1207.

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Reactions of [Cp*IrCl2]2 (Cp*=η3-C5Me5) with [MgC4H6·2 THF]n at low temperature give [Cp*Ir(η4-C4H6)] together with [Cp*Ir(η3-C4H7)R] compounds, the latter being formed via C-H activation of solvent molecules RH (RH = benzene, toluene, anisole, thiophene, furane, N-methylpyrrole, pentane, cyclohexane. THF). In the case of pyrrole, C-N -activation occurs. The ratio of syn and anti isomers of the 1-methylallyl complexes as well as the sites of C-H activation of RH were investigated by NMR spectrometry. An enantiomorphous crystal of [Cp*Ir(η3-C4H7)C6Hs] was characterized by X-ray diffraction analysis which reveals trigonal planar coordination at the Ir atom and an exo, syn conformation of the 1-methylallyl ligand. A mechanism of the reaction which involves 16-electron intermediates is discussed. The corresponding system [Cp*RhCl2]2/butadienemagnesium/RH gives only [Cp*Rh(η4-C4H6)], and no C-H activation is observed.

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19

Warm, Katrin, Guilherme Tripodi, Erik Andris, Stefan Mebs, Uwe Kuhlmann, Holger Dau, Peter Hildebrandt, Jana Roithová, and Kallol Ray. "Spektroskopische Charakterisierung eines reaktiven [Cu 2 (μ‐OH) 2 ] 2+ Intermediates in Cu/TEMPO‐katalysierten aeroben Alkoholoxidationen." Angewandte Chemie, September 8, 2021. http://dx.doi.org/10.1002/ange.202108442.

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