Dissertations / Theses on the topic 'Radikal <Chemie>'
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Herterich, Jörg [Verfasser], and Ingo [Gutachter] Fischer. "Pikosekunden-zeitaufgelöste Photoionisation: 2-Methylallyl-Radikal und Pyracen / Jörg Herterich. Gutachter: Ingo Fischer." Würzburg : Universität Würzburg, 2014. http://d-nb.info/1109750188/34.
Full textHerterich, Jörg-Viktor [Verfasser], and Ingo [Gutachter] Fischer. "Pikosekunden-zeitaufgelöste Photoionisation: 2-Methylallyl-Radikal und Pyracen / Jörg Herterich. Gutachter: Ingo Fischer." Würzburg : Universität Würzburg, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-105829.
Full textLibrera, Christian. "Konformationelle und sterische Effekte in der 1,2-Umlagerung von 1,3-Cyclopentandiyl-Radikalkationen." Doctoral thesis, [S.l.] : [s.n.], 2002. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-4134.
Full textThe present study provides valuable mechanistic insight into the intricacies and complexities in the rearrangement of the 1,3 radical cations [generated by electron transfer with tris(p-bromo)phenylaminium hexachloroantimonate (TBA•+SbCl6-)] and the corresponding carbocations [formed by protonation with trifluoroacetic (TFA) and perchloric acid (HClO4)]. This elaborate comparative study provides a mechanistic assessment of the interplay of conformational, electronic and steric effects on the product selectivity in the rearrangement of radical cations and the corresponding carbocation intermediates as required by stereoelectronic control. For all activation modes in the rearrangement of the housanes I stereochemical memory operates, which is imposed by the conformational requirements that are dictated by the stereoelectronics of the 1,2 migration. As a consequence, the ratio of the rearrangement products II/III is insensitive to the migratory aptitude of the R substituent in the housanes I. Additionally, it has been demonstrated that structural changes allow to manipulate the conformational effects in the rearrangement of 1,3-cyclopentandiyl radical cations that either stereochemical memory or Curtin / Hammett behavior is observerd. The electron-transfer-catalyzed rearrangement of the housanes I affords regioselectively exclusively the two cyclopentenes II (CH3 migration) and III (R migration) by 1,2 shift of the two groups at the methano bridge to the methyl terminus For all derivatives, the 1,2 shift of the CH3 group prevails and the rearrangement ratio is relatively insensitive to the migratory aptitude of the R substituent. The TFA-catalyzed rearrangement leads to a similar regio- and stereoselectivity as in the case of electron transfer. Thus, only the cyclopentenes II and III are produced with predominant CH3 migration.The rearrangement catalyzed by HClO4 leads to complete reversal in product distribution compared to the above-desribed rearrangements. The bridged structures I•+, I(edge-H)+ and I(corner-H)+ are suggested as key intermediates. In the electron-transfer and TFA-catalyzed rearrangements, the two puckered intermediates I•+and I(edge-H)+ intervene, whereas the open structure I(corner-H)+, formed by direct cornerwise protonation of the housane I, is suggested. In all cases, the CH3 group migrates in preference, the stereochemical memory effect accounts for the observed product selectivity. To probe the influence of ring annelation on the product selectivity, also the tetracyclic housanes IV were subjected to the electron-transfer oxidation by TBA•+SbCl6- (Table B). The electron-transfer rearrangement of the housanes IV on treatment with TBA•+SbCl6- affords regioselectively the two isomeric products V (55%) and VI (45%) by migration of the two groups at the methano bridge. In contrast, the methyl derivative IV is neither regio- nor stereoselective and leads to the three isomeric cyclopentenes V (37%), VI (25%), and VII (43%). Acid-catalyzed rearrangement of the housane IV gives in addition to V (24%) and VI (9%), the regiosiomer VII (67%) as major product. Acid-catalyzed rearrangement of the methyl-substituted housane IV yields regio- and stereoselectively the quinane V(> 95%). For the housane IV a mechanistically pertinent viscosity dependence is disclosed on the product selectivity. Whereas at low viscosity the two cyclopentenes V and VI are formed in nearly equal amounts, the methyl migration product V dominates more than twofold at higher viscosity. In contrast, the electron-transfer-induced rearrangement of the isomeric housanes anti-I and syn-I does not depend on the solvent viscosity (Scheme B). To evaluate quantitatively the extent of stereochemical memory, the ratios k2/k1 and k3/k-1 serve as a quantitative measure of the stereoselectivity, that is, for the case k2 >> k1 and k3 >> k-1 perfect stereochemical memory applies, whereas for the case k2 << k1 and k3 << k-1 complete Curtin-Hammett behavior operates. Thus, the CD3 migration in the anti-I•+(twisted) conformer (k2) proceeds ca. seven times faster than the conformational anti-to-syn change (k1) to the conformer syn-I•+(twisted), whereas the CD3 transfer in the syn-I•+(twisted) conformer (k3) is only ca. three times faster than the syn-to-anti conformational change (k-1) to the anti-I•+(twisted) species. The present study reveals that the product selectivity of the 1,2 migration in the electron-transfer as well as in the acid-catalyzed rearrangement of the housanes I is decisively determined by conformational and steric factors. For all activation modes, the stereochemical memory effect operates. As a consequence, the ratio of rearrangement products is essentially insensitive to the migratory aptitude of the R substituent in the housanes I. This stereochemical memory effect derives from the conformational imposition on the stereoelectronic requirements during the 1,2 migration of the 1,3-radical-cation intermediates. Appropriate ring annelation in the intermediary 1,3-cyclopentandiyl radical cation allows to change the stereochemical course of the rearrangement from stereochemical memory (tricycylic housanes I) to complete loss of sterecontrol through Curtin/Hammett behavior (tetracyclic housanes IV); thus, cyclohexane annelation erases the stereochemical memory effect. Such structural manipulation of the conformational control in radical-cation rearrangements has hitherto not been documented. The observed Curtin/Hammett behavior of the housane IV represents the first case for which conformational equilibration precedes competing product formation through 1,2 migration, which could have hardly been anticipated
Jagiella, Stefan. "Thermische Stabilität von Carbonylradikalen in der Gasphase." [S.l. : s.n.], 2005.
Find full textSommer, Christian. "Neue Imidazolin Nitroxid-Radikale und Übergangsmetallkomplexe mit Nitroxid-Radikalen." Diss., lmu, 2002. http://nbn-resolving.de/urn:nbn:de:bvb:19-1442.
Full textPachner, Kai [Verfasser], and Ingo [Gutachter] Fischer. "Photodissoziationsreaktionen der Xylyl-Radikale, C8H9, und des Benzyl-Radikals, C7H7: Eine Velocity-Map-Imaging-Studie / Kai Pachner ; Gutachter: Ingo Fischer." Würzburg : Universität Würzburg, 2018. http://d-nb.info/1170583393/34.
Full textShenolikar, Justin [Verfasser]. "Nighttime Radical NOx Chemistry by CRD / Justin Shenolikar." Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2021. http://d-nb.info/1225795990/34.
Full textWeinert, Christoph [Verfasser]. "Lichtinduzierte Primärprozesse des stabilen Radikals 1,3,5-Triphenylverdazyl / Christoph Weinert." Bonn : Universitäts- und Landesbibliothek Bonn, 2016. http://d-nb.info/1198933372/34.
Full textAdam, Ahmad Y. [Verfasser]. "Theoretical Molecular Spectroscopy of the Methyl Radical / Ahmad Y. Adam." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/1194581242/34.
Full textStadler, Sonja [Verfasser]. "Combination of Free Radical Addition with Insertion Chain Growth / Sonja Stadler." Konstanz : KOPS Universität Konstanz, 2020. http://d-nb.info/1222437295/34.
Full textPrina, Cerai Gabriele [Verfasser], Bill [Gutachter] Morandi, and Lukas J. [Gutachter] Gooßen. "First row transition metal catalyzed radical transformations / Gabriele Prina Cerai ; Gutachter: Bill Morandi, Lukas J. Gooßen ; Fakultät für Chemie und Biochemie." Bochum : Ruhr-Universität Bochum, 2018. http://d-nb.info/1161942025/34.
Full textSchur, Christine [Verfasser], and Jens [Akademischer Betreuer] Hartung. "Reaktivität und Selektivität anellierter, verbrückter und tertiärer Sauerstoff-Radikale / Christine Schur. Betreuer: Jens Hartung." Kaiserslautern : Technische Universität Kaiserslautern, 2015. http://d-nb.info/1075492769/34.
Full textWu, Lei Verfasser], Alexander [Akademischer Betreuer] Böker, and Andrij Z. [Akademischer Betreuer] [Pich. "Surface-initiated controlled radical polymerizations from silica nanoparticles / Lei Wu ; Alexander Böker, Andrij Pich." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130590585/34.
Full textKoziakov, Denis [Verfasser], and von Wangelin Axel [Akademischer Betreuer] Jacobi. "Radical Aromatic Substitutions Mediated by Weak Bases / Denis Koziakov ; Betreuer: Axel Jacobi von Wangelin." Regensburg : Universitätsbibliothek Regensburg, 2017. http://d-nb.info/1145292127/34.
Full textWu, Lei [Verfasser], Alexander Akademischer Betreuer] Böker, and Andrij Z. [Akademischer Betreuer] [Pich. "Surface-initiated controlled radical polymerizations from silica nanoparticles / Lei Wu ; Alexander Böker, Andrij Pich." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130590585/34.
Full textPütz, Anna-Maria [Verfasser]. "Phosphonate ligands in extended inorganic hybrids and as radical units in complexes / Anna-Maria Pütz." Mainz : Universitätsbibliothek Mainz, 2015. http://d-nb.info/1075871387/34.
Full textLang, Andreas [Verfasser], and Mukundan [Akademischer Betreuer] Thelakkat. "Semiconductor Polymer Architectures using Click Chemistry and Controlled Radical Polymerization / Andreas Lang. Betreuer: Mukundan Thelakkat." Bayreuth : Universitätsbibliothek Bayreuth, 2011. http://d-nb.info/101923458X/34.
Full textÖlscher, Franz [Verfasser]. "Role of Radical Species in Neutral Salicylaldiminato Ni(II) Mediated Polymer Chain Growth / Franz Ölscher." Konstanz : Bibliothek der Universität Konstanz, 2017. http://d-nb.info/113299568X/34.
Full textRiemann, Lara [Verfasser]. "Termination Kinetics of Radical Homo- and Copolymerizations Studied via Time-Resolved EPR Spectroscopy / Lara Riemann." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/1235222764/34.
Full textWolf, Thomas J. A. [Verfasser]. "Ultrafast photophysics and photochemistry of radical precursors in solution / Thomas J. A. Wolf." Karlsruhe : KIT Scientific Publishing, 2012. http://www.ksp.kit.edu.
Full textWolf, Thomas [Verfasser]. "Ultrafast photophysics and photochemistry of radical precursors in solution / Thomas J. A. Wolf." Karlsruhe : KIT Scientific Publishing, 2012. http://nbn-resolving.de/urn:nbn:de:0072-308625.
Full textXue, Wenwen [Verfasser], and P. [Akademischer Betreuer] Théato. "Functional TEMPO-Containing Polymers: Synthesis and Application in Organic Radical Batteries / Wenwen Xue ; Betreuer: P. Théato." Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1223985962/34.
Full textGao, Shuang [Verfasser], Meike [Akademischer Betreuer] Niggemann, and Markus [Akademischer Betreuer] Albrecht. "Study of reactive intermediates: vinyl cations and aminium radical cations / Shuang Gao ; Meike Niggemann, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1181109159/34.
Full textPaulsen, Helena [Verfasser], and Gerrit A. [Akademischer Betreuer] Luinstra. "Synthesis and Characterization of Hydrogels prepared by Free Radical Polymerization / Helena Paulsen ; Betreuer: Gerrit A. Luinstra." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1165774399/34.
Full textXie, Gaozhan Verfasser], and Uwe H. F. [Akademischer Betreuer] [Bunz. "Synthesis and Characterization of Azaacenes and Stable Azaacene Radical Cations / Gaozhan Xie ; Betreuer: Uwe H. F. Bunz." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1216506620/34.
Full textAltmann, Lisa-Marie [Verfasser], Markus [Akademischer Betreuer] Heinrich, and Svetlana [Gutachter] Tsogoeva. "Towards biocompatible radical arylations starting from diazonium salts / Lisa-Marie Altmann ; Gutachter: Svetlana Tsogoeva ; Betreuer: Markus Heinrich." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1231077913/34.
Full textXie, Gaozhan [Verfasser], and Uwe H. F. [Akademischer Betreuer] Bunz. "Synthesis and Characterization of Azaacenes and Stable Azaacene Radical Cations / Gaozhan Xie ; Betreuer: Uwe H. F. Bunz." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1216506620/34.
Full textWang, Di [Verfasser]. "Reversible Stimuli Responsive Radicals and Their EPR Spectroscopic Characterization / Di Wang." Mainz : Universitätsbibliothek Mainz, 2019. http://d-nb.info/1177190931/34.
Full textFleck, Maurizio-Nicolas [Verfasser]. "Versatile Trityl Radicals: Improving Applications via Tailored Synthesis / Maurizio-Nicolas Fleck." Bonn : Universitäts- und Landesbibliothek Bonn, 2021. http://d-nb.info/1238687830/34.
Full textHioe, Johnny. "Theoretical investigations of radicals in biology and chemistry." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-163694.
Full textSchröder, Hendrik [Verfasser], Michael [Akademischer Betreuer] [Gutachter] Buback, and Philipp [Gutachter] Vana. "Metal-Catalyzed Radical Polymerization up to High Pressure / Hendrik Schröder. Betreuer: Michael Buback. Gutachter: Michael Buback ; Philipp Vana." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://d-nb.info/1113288698/34.
Full textHüttermann, Jürgen [Verfasser]. "Elektronenspin-Resonanz freier Radikale in bestrahlten Einkristallen von 5-Halo-Uracil-Derivaten, Desoxyribose und weiteren Nukleinsaeurekomponenten / Jürgen Hüttermann." Karlsruhe : KIT-Bibliothek, 2008. http://d-nb.info/1186272260/34.
Full textDertinger, H. [Verfasser]. "Die Identifizierung freier Radikale in bestrahlten Einkristallen einiger Nukleinsaeurekomponenten mittels Elektronenspin-Resonanz bei 8 mm Wellenlaenge / H. Dertinger." Karlsruhe : KIT-Bibliothek, 2008. http://d-nb.info/1186086718/34.
Full textSchröder, Hendrik Verfasser], Michael [Akademischer Betreuer] [Buback, and Philipp [Gutachter] Vana. "Metal-Catalyzed Radical Polymerization up to High Pressure / Hendrik Schröder. Betreuer: Michael Buback. Gutachter: Michael Buback ; Philipp Vana." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://nbn-resolving.de/urn:nbn:de:gbv:7-11858/00-1735-0000-0023-962F-C-4.
Full textJung, Martin [Verfasser]. "Magnetische Wechselwirkung Spin-Austauschgekoppelter Systeme mit Nitroxid und Nitronyl-Nitroxid Radikalen / Martin Jung." Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/1025052889/34.
Full textHioe, Johnny [Verfasser], and Hendrik [Akademischer Betreuer] Zipse. "Theoretical investigations of radicals in biology and chemistry / Johnny Hioe. Betreuer: Hendrik Zipse." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1045561495/34.
Full textZhang, Duo Verfasser], Carsten [Akademischer Betreuer] [Bolm, and Markus [Akademischer Betreuer] Albrecht. "Photocatalyzed generation and application of sulfoximidoyl radicals / Duo Zhang ; Carsten Bolm, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1210936410/34.
Full textKolanji, Kubandiran [Verfasser]. "Organic Radicals for Magnetic Materials through Controlling of Magnetic Exchange Interactions / Kubandiran Kolanji." Mainz : Universitätsbibliothek Mainz, 2019. http://d-nb.info/1175536792/34.
Full textZhang, Duo [Verfasser], Carsten [Akademischer Betreuer] Bolm, and Markus [Akademischer Betreuer] Albrecht. "Photocatalyzed generation and application of sulfoximidoyl radicals / Duo Zhang ; Carsten Bolm, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1210936410/34.
Full textSörensen, Nicolai [Verfasser], Michael [Akademischer Betreuer] Buback, and Philipp [Akademischer Betreuer] Vana. "Kinetics and Mechanism of Cu-Catalyzed Atom Transfer Radical Polymerization / Nicolai Sörensen. Betreuer: Michael Buback. Gutachter: Michael Buback ; Philipp Vana." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://d-nb.info/107815080X/34.
Full textDammeier, Johannes [Verfasser]. "A Shock Tube Study of NCN and HCO Radical Reactions Related to the NOx Formation in Combustion Processes / Johannes Dammeier." Kiel : Universitätsbibliothek Kiel, 2011. http://d-nb.info/1020244909/34.
Full textMannsperger, Johannes [Verfasser], and Sonja [Akademischer Betreuer] Herres-Pawlis. "New hybrid guanidine-quinoline copper complexes and their use in atom transfer radical polymerization / Johannes Mannsperger ; Betreuer: Sonja Herres-Pawlis." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2018. http://d-nb.info/1210861674/34.
Full textXue, Weichao [Verfasser], Martin [Akademischer Betreuer] Oestreich, Martin [Gutachter] Oestreich, and Werz [Gutachter] Daniel. "Metal-catalyzed radical C(sp3)–Si/Ge cross-coupling reactions / Weichao Xue ; Gutachter: Martin Oestreich, Werz Daniel ; Betreuer: Martin Oestreich." Berlin : Technische Universität Berlin, 2019. http://d-nb.info/1191256707/34.
Full textSoldi-Lose, Héloïse [Verfasser]. "Gas-Phase Ion and Radical Chemistry of CO2 Adducts with Possible Relevance in the Atmosphere of Mars / Héloïse Soldi-Lose." Aachen : Shaker, 2008. http://d-nb.info/1161307567/34.
Full textSörensen, Nicolai Verfasser], Michael [Akademischer Betreuer] [Buback, and Philipp [Akademischer Betreuer] Vana. "Kinetics and Mechanism of Cu-Catalyzed Atom Transfer Radical Polymerization / Nicolai Sörensen. Betreuer: Michael Buback. Gutachter: Michael Buback ; Philipp Vana." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://nbn-resolving.de/urn:nbn:de:gbv:7-11858/00-1735-0000-0023-9662-7-2.
Full textDinkov, Ilian [Verfasser], and H. [Akademischer Betreuer] Bockhorn. "Experimentelle und theoretische Untersuchungen zur Verbrennung in radial durchströmten porösen inerten Medien / Ilian Dinkov ; Betreuer: H. Bockhorn." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1151229318/34.
Full textRavat, Prince [Verfasser]. "Tuning of magnetic exchange interactions between organic radicals through bond and space / Prince Ravat." Mainz : Universitätsbibliothek Mainz, 2014. http://d-nb.info/1060526719/34.
Full textSievers, Gustav [Verfasser]. "Der Einfluss von Hydroxyl-Radikalen auf die Oberflächeneigenschaften von Gold und Platin / Gustav Sievers." Greifswald : Universitätsbibliothek Greifswald, 2012. http://d-nb.info/1024309045/34.
Full textBorozdina, Yulia B. [Verfasser]. "Aminoxyl radicals - pure organic materials with tunable magnetic and sensing properties / Yulia B. Borozdina." Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1023189488/34.
Full textShi, Yinfeng Verfasser], and Seema [Akademischer Betreuer] [Agarwal. "Design, Synthesis and Application of Novel Degradable Materials Based on Polyesters by Radical Ring-Opening Polymerization / Yinfeng Shi. Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2015. http://d-nb.info/1080237577/34.
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