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Institute
- Institut für Organische Chemie (545) (remove)
Schriftenreihe
Sonstige beteiligte Institutionen
- International Max Planck Research School Molecular Biology, University of Göttingen, Germany (2)
- Agricultural Center, BASF SE, 67117 Limburgerhof, Germany (1)
- Center for Computational and Theoretical Biology (CCTB), Universität Würzburg (1)
- Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany (1)
- Center for Nanosystems Chemistry (1)
- Center for Nanosystems Chemistry (CNC), University of Würzburg (1)
- Center for Nanosystems Chemistry (CNC), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany (1)
- Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague, Czech Republic (1)
- Chemical Biology Laboratory, National Cancer Institue, Frederick (USA) (1)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells, Göttingen (1)
Die vorliegende Arbeit behandelt die Synthese sowie die Eigenschaften einer Serie von organofunktionellen α-, β-, γ- und ζ-Silanen, mit einem Fokus auf Alkoxy(aminoalkyl)silanen. Der Großteil dieser Modellstrukturen wurde anschließend hinsichtlich ihrer Hydrolysekinetik in Abhängigkeit der Art der funktionellen Gruppe X (NMe3+, N(H)COOMe, N(Me)COOMe, NH2, N(H)Me, NMe2, Pip, Me), des Abstandes des Substituenten X zu dem Silicium-Atom
(α-, β-, γ- und ζ-Position), der Alkoxy-Abgangsgruppe am Silicium-Atom (MeO, iPrO, tBuO) und des pD-Wertes der Reaktionslösung systematisch untersucht.
Eine große Herausforderung dieser Studie war die Synthese von β-Amino-funktionalisierten Alkoxysilanen, deren Chemie aufgrund ihrer Labilität bisher kaum erforscht ist. Die einzigen literaturbekannten Vertreter stellten bislang das Trialkoxysilan (EtO)3Si(CH2)2NH2 (1) und sein Dialkoxy-Derivat (EtO)2SiMe(CH2)2NH2 (2) dar, welche durch Reaktion des entsprechenden 2-(Chlorethyl)silans mit Ammoniak unter hohem Druck im Autoklaven zugänglich sind. Unter Verwendung dieser Synthesemethode konnte sowohl die Synthese der Silane 1 und 2 reproduziert, als auch das Trimethoxy-Analogon (MeO)3Si(CH2)2NH2 (3) erstmals dargestellt werden.
Darüber hinaus wurde eine Serie von organofunktionellen Monoalkoxysilanen des Typs RORSiMe(CH2)2X und ROSiMe2C(H)MeCH2X (4b–18b) im präparativen Maßstab analyserein dargestellt.
Des Weiteren wurden die entsprechenden α-Silane 8a, 11a, 14a und 15a, die γ-Silane 6c, 8c, 11c, 13c–15c und 18c sowie die ζ-Silane 19 und 20 erstmals dargestellt.
Weiterhin wurden die bereits literaturbekannten α-Silane 16a–18a und γ-Silane 7c, 16c und 17c für die Verwendung in den Hydrolyseexperimenten synthetisiert.
Die Charakterisierung aller im Rahmen dieser Arbeit synthetisierten Verbindungen erfolgte mittels NMR-Spektroskopie (1H-, 13C-, 15N- und 29Si-NMR) und Elementaranalysen (C, H, N) bzw. HRMS-Experimente.
Die hydrolytische Spaltung der Si–OC-Bindung in Alkoxy(aminoalkyl)silanen stellt einen technisch sehr wichtigen Schlüsselschritt in der Synthese von Amino-funktionalisierten Polysiloxanen dar. Um den Mechanismus dieser Si–OC-Bindungsspaltung besser zu verstehen, wurden die Alkoxysilane 4b, 4c, 5b, 6b, 6c, 7b, 7c, 8a–8c, 9b, 11a–11c, 12b, 14a–14c,
15a–15c, 16a–16c, 17a–17c, 18a–18c, 19 und 20 hinsichtlich ihrer Hydrolysekinetik in CD3CN/D2O unter sauren und basischen Bedingungen mittels 1H-NMR-Spektroskopie untersucht.
Die Ergebnisse dieser Struktur–Reaktivitäts-Studie zeigten, dass die beobachteten unterschiedlichen Hydrolysegeschwindigkeiten das Resultat mehrerer Faktoren sind, wie beispielsweise elektronische und sterische Effekte, der große Einflusses des pD-Wertes und auch intramolekulare N–H∙∙∙O-Wasserstoffbrückenbindungen zwischen der protonierten Amino-Gruppe und der Alkoxy-Abgangsgruppe. Da der Einfluss dieser Effekte auf die Reaktivität der untersuchten α-, β-, γ- und ζ-Silane sehr unterschiedlich ist, kann kein klarer Zusammenhang zwischen der Hydrolysereaktivität und der Positionierung der stickstoff-haltigen funktionellen Gruppe (α-, β-, γ- und ζ-Position) erkannt werden. Die jeweils beobachtete Reaktivität entspricht vielmehr einer Summe aller zuvor genannten Teileffekte.
Die Erkenntnisse, die im Rahmen dieser Arbeit erhalten wurden, ermöglichen ein verbessertes grundlegendes Verständnis der Reaktivität von funktionalisierten α-, β-, γ- und ζ-Silanen, und sind für die Silicon-Industrie von großem Interesse, da sie eine gezieltere Anwendung der α-, β- und γ-Aminosilane in der Synthese von technisch wichtigen Amino-funktionalisierten Polysiloxanen erlauben.
Reaktionen von 1,3-Butadien und einigen seiner Methylderivate mit 1a und 1- Methyl-1,2-cyclohexadien 1b sowie den Übergang der [2 + 2]-Cycloaddukte 2 und 3 in das bisher unbekannte 1,2,3,5,8,8a-HexahydronaphthaJin 4a und einige seiner Methylderivate
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Herein we devise and execute a new synthesis of a pristine boron-doped nanographene. Our target boron-doped nanographene was designed based on DFT calculations to possess a low LUMO energy level and a narrow band gap derived from its precise geometry and B-doping arrangement. Our synthesis of this target, a doubly B-doped hexabenzopentacene (B\(_{2}\)-HBP), employs six net C−H borylations of an alkene, comprising consecutive hydroboration/electrophilic borylation/dehydrogenation and BBr\(_{3}\)/AlCl\(_{3}\)/2,6-dichloropyridine-mediated C−H borylation steps. As predicted by our calculations, B\(_{2}\)-HBP absorbs strongly in the visible region and emits in the NIR up to 1150 nm in o-dichlorobenzene solutions. Furthermore, B\(_{2}\)-HBP possesses a very low LUMO level, showing two reversible reductions at −1.00 V and −1.17 V vs. Fc\(^{+}\)/Fc. Our methodology is surprisingly selective despite its implementation of unfunctionalized precursors and offers a new approach to the synthesis of pristine B-doped polycyclic aromatic hydrocarbons.
The He (I) photoelectron spectra of 2-bicyclo[2.1.l]hexene (1), 2,3-bis(methylene)bicyclo[2.1.l]hexane (3), and 3,4-bis(methylene)tricyclo[3.l.O.0\(^{2.6}\)]hexane (4) have been investigated. The assignment given is based on a ZDO model and semiempirical calculations. Tagether with the PE data of benzvalene (2), the reported data allow a comparison between 1-2 and 3-4. This yields a measure of the interactions between 8 cyclobutane or 8 bicyclobutane moiety and a double bond system within a ZDO model. The resonance integral found in the case of 1 and 3 amounts to -1.9 eV, that for 2 and 4, to -2.3 eV. The investigations furthermore reveal that the electronic factors which contribute to the higher reactivity of the bicyclobutane compounds amount to 5 kcal/mol.
Phenyl(tricyclo[4.1.0.0\^(^{2,7}\)] hept-4-en-3-yl)sulfone 8 has been prepared in two steps from 4,S-dlbromohomobenzvalene (6) and deprotonated to give the title compound 9. The carbon-13 NMR spectrum of 9 reveals a considerable interaction between the allyl anion moiety and the bicyclobutane system.
Aufbauend auf einen Datensatz von etwa 70 antimalaria-aktiven Verbindungen wurde mit Hilfe des CoMSIA-Verfahrens ein QSAR(Qantitative Structure Activity Relationship)-Modell erstellt, das in der Lage ist antiplasmodiale Aktivitäten von Verbindungen aus der Substanzklasse der Naphthylisochinolin-Alkaloide vorherzusagen. Da die behandelten Strukturen ein sehr kompliziertes konformatives Verhalten aufweisen, mussten für ein möglichst flexibles Alignment (unter Verwendung von FLEXS und GASP) eigene Abläufe entwickelt werden, die schließlich weitestgehend automatisiert werden konnten. Das erstellte Modell erlaubte es darüber hinaus, die für die Aktivität verantwortlichen strukturellen Merkmale zu identifizieren und so entscheidende Anregungen zur Vereinfachung des relativ komplizierten Grundgerüsts zu geben. Die Vorschläge wurden zu einem großen Teil bereits synthetisch verwirklicht, wobei die anschließend experimentell gefundenen Aktivitäten die vorher berechneten sehr gut bestätigten. Die neu entwickelten Substanzen befinden sich derzeit im Patentprüfungsverfahren.
4-Bromoctavalen und zwei (Brommethylen)homobenzvalene anstelle eines erwarteten Bromoctabisvalens
(1988)
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Das exo/endo--lsomerenverhältnis Ja: Jb bei der bekannten [2 + 2]-Cycloaddition von Styrol an 1,2-Cyclohexadien (2) wurde als tempcraturabhingiaaefunden. Der Einsatz von (Z)-Dcutcriostyrollicfene den Beweis der Zweistufiakeit dieser Reaktion, und das Diradikal 4 wird als wahrscheinlichste Zwischenstufe anaesehen. Erhitzen von Jb auf 140-170°C führte zur Binstellung des thermodynamischen Gleichgewichts mit Ja (Ja:3b = 93:7), wobei wieder das Diradikal4 als Zwischenstufe fungieren dürfte. Mit Hilfe kinetischer Messungen ermittelte man die Aktivierungsparameter für das System Ja~ 3b. - Aus 2 und den Abfangreagenzien p-Methoxystyrol, 1,1-Diphenylethylen sowie 1-Phenylpropen gingen mit bescheidenen Ausbeuten die Titelverbindungen 6a, b, 7 bzw. 8 hervor. Analoa zu 2 wurde sein l-Methylderivat 13 aus 6,6-Dibrom-1-methylbicyclo[3.1.0]hexan (9) durch Methyllithium freigesetzt. In Gegenwart von Styrol entstand neben den Abfanaprodukten 14a, b auch das Dimere 12 von lJ. - Die 1H-NMR-Spektren der Titelverbindungen belegen eine starre Halbsesselkonformation des Cyclohexentcils mit äquatorial anellienem Cyclobutanring.
7-Azatetracyclo[4.1.0.0<sup>2,4</sup>.0<sup>3,5</sup>]heptan - ein neues Valenzisomeres des Azepins
(1979)
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7-Thiatetracyclo[4.1.0.0\(^{2,4}\).0\(^{3,5}\)]heptan (Benzvalensulfid) - Synthese und Reaktionen
(1982)
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