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Showing 1 to 20 of 71 for “"Arenes"”.
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Hydroxyl radical additions to arenes
Anthropogenic input of organic compounds into aqueous environments and the effects of these contaminants on ecosystems, as well as human health are of great concern. Many contaminants are found in concentrations in excess of the accepted daily intake (ADI) values. The fate of these contaminants as …
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Arenophile-mediated dearomative functionalization of unactivated arenes
… formed by irradiation of mixtures of unactivated arenes and MTAD at cryogenic temperatures with visible light. These cycloadducts are subsequently used as substrates in metal-catalyzed transformations. In chapter one a palladium-catalyzed dearomative syn- 1,4-diamination of unactivated arenes is …
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Stereo-Selective Synthesis of Bis-bridged calix[6]arenes
… substrate and metal ion to form a complex. Calixarenes have certain structural features analogous to enzymes, which include a well-defined cavity for host-guest complex interactions, and potential for structural variation. Research conducted in the Blanda group has focused on the synthesis of …
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Investigations into the Synthesis of InherentlyChiral Calix[4]arenes
… and synthesis of highly functionalised calix[4]arenes are of great interest for research. The modification of the upper-rim of calix[4]arene allows the lower-rim to act as a potential molecular binding site. Our objective is to develop methodologies and synthetic routes that allow us to generate …
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Synthesis and cation binding properties of bis-bridged calix[6]arenes
Calixarenes have been studied and utilized for their molecular recognition properties. A total of four bis-bridged calix[6]arenes have been synthesized and their metal binding properties and structural conformations were studied in solid, solution, and gas phase. Methods of testing include: NMR …
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Conformationally Immobile Calix[6]arenes as Negative Resists in Electron Beam Lithography
… features. Literature reports that calixarenes have the potential to meet this challenge, due to their ultrahigh resolution and their process robustness. For this study, the “1,2,3-alternate” and “cone” conformers of Diallyloxy-Bis-/77-Xylenyloxycalix[6]arene were synthesized via a …
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Synthesis of Tin Containing Calix[4]arenes and their Anion Binding Capabilities
… research has been done on the ability of calixarenes to complex cations and neutral species. The electron-rich molecular cavity and lower rim consisting of a cyclic array of oxygen donors makes the structure of the calixarene conducive to this type of complexation. Conversely, the calixarenes …
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Factors Influencing the Stereochemistry in Bis-bridging Reactions of calix[6]arenes
No abstract prepared.
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Fused Arenes-Based Molecular and Polymeric Materials for Organic Field Effect Transistors
… main desire is to synthesize novel organic fused-arenes having efficient charge carrier mobilities, as well as to optimize optical properties for organic field effect transistors (OFETs). Novel series of fused arene molecules of 9,10-di(thiophen-3-yl)anthracene (1), trans-2,5-(dianthracene-9- …
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Ligand-Driven Development of Pd-Catalyzed Nondirected C–H Activation of Arenes
… of clickable alkyne motifs into (hetero)arenes. Using a dual-ligand palladium catalyst system based on an N-acylsulfonamide (NASA) ligand and a pyrazine-derived ligand, the methodology enables broad substrate scope and direct access to alkyne-tagged scaffolds suitable for copper-catalyzed …
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Dearomative functionalization of simple arenes: Reduction and palladium-catalyzed syn-1,4-aminofunctionalizations
… in this field. That is, simple and non-activated arenes, such as benzene and naphthalene, have seldom been employed in the dearomative functionalization reactions due to their extreme inertness. Considering a wide availability of such simple arenes, the development of novel dearomative methods for …
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Polymers containing calix[4]arenes and triptycenes : new syntheses, properties and applications
… with complex molecular structures. Calix[4]arenes and triptycenes are the two major molecular building blocks for constructing the functional polymers. Unusual properties, with the emphasis on mechanical and sensory properties, are demonstrated. In Chapter 2, early investigations on the …
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Nondirected C(sp2)–H Activation of (Hetero-)Arenes Through Ligand-Enabled Palladium Catalysis
… which efficiently enables C–H activation of arenes and subsequent C–H functionalization through diverse follow-up steps. The second chapter describes attempts to develop catalysts for the nondirected fluorination of arenes. While a suitable combination of a dual-ligand based catalyst system …
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Advances in synthetic methodology: Dearomative aminofunctionalization of arenes and high-throughput reaction discovery
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Investigations of the Non-Covalent Interactions of Arenes Using Phencyclone Based Molecular torsion Balances
… to quantify the non-covalent interactions of arenes have been synthesized and studied. These molecular balances are atropisomeric small molecule model system that exhibit two distinct states, one with and one without an intramolecular non-covalent arene interaction. The disproportion in the …
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Oxidative palladium(II) catalyzed cross dehydrogenative couplings of indolines with arenes and alkenes at the C-7 position
In der Vergangenheit wurden verschiedene Arten von vorfunktionalisierten Kupplungspartnern wie Boronsäuren oder metallorganische Reagenzien in Kombination mit katalytischen Mengen eines Übergangsmetalls eingesetzt, um C(sp2)–C(sp2)-Bindungen zu knüpfen. Später änderte sich der Fokus auf die direkte …
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Studies toward the synthesis of celastrol and the late-stage hydroxylation of arenes mediated by 4,5-dichlorophthaloyl peroxide
… initial report describing the hydroxylation of arenes using phthaloyl peroxide, new peroxide derivatives were investigated to probe their reactivity in an effort to hydroxylate aromatics which were previously unreactive. Electronically poor to moderately rich arenes were successfully …
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Lithiation of Oxy-Arenes; New Methodology for Electrophilic Aromatic Substitutions: Attempted Synthesis of Thiaheptalenes and Heterocyclic Pyrene Systems
Lithiation of oxy-arenes was studied. The lithiation of 4-hydroxyphenanthrene with 2 eq. of n-butyllithium/TMEDA in cyclohexane at 23(DEGREES)C occurs completely at the 5-position, although the 5-position is the most hindered position in the 4-hydroxyphenanthrene. By contrast, the lithiation of …
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Dearomative reduction of arenes through the use of arenophiles & studies towards the synthesis of cardiotonic steroids calotropin and calactin
A novel method for the dearomative reduction of arenes through the use of N,N-arenophile, MTAD, was developed. Cheap feedstock arenes undergo photocycloaddition with MTAD, and the cycloadduct can be treated further to furnish novel 1,3-cyclohexadienes or 1,4-diamino-2- cyclohexenes. The utility of …
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Investigation of artificial malonyl group carriers and multifunctional cyclic scaffolds towards the mimicry of PKS
… method to obtain monofunctionalised calix[4]arenes blocked in a cone conformation is described. A broad range of monoarmed calix[4]arenes have been synthesised and the properties of some of these calix[4]arenes studied. In addition, a simple method for the preparation of multi functional …
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