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Showing 1 to 14 of 14 for “"Electrophilic Aromatic Substitution"”.
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Molecular Orbital Calculations on Electrophilic Aromatic Substitution
… at any given point during the course of an electrophilic aromatic substitution reaction. Although the calculations were made using a proton as an electrophile, the method should be applicable to other electrophiles with only slight modification. A modification of the Pariser-Parr-Pople …
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Directed Ortho-Metalation of Dimethylarylamines
… can be synthesized directly, i.e., by substitution of a proton, using either of two procedures: electrophilic aromatic substitution (EAS) or directed ortho-metalation (DoM). Directed ortho-metalation (DoM) is an alternative aromatic substitution process initiated by organolithium …
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Palladium-Imidazolium Carbene Catalyzed Heck Coupling Reactions and Synthesis of a Novel Class of Fluoroanthracenylmethyl PTC Catalysts
… was used for the challenging electron-deficient electrophilic aromatic substitution step. These new catalysts proved to have high selectivities for glycine alkylation under mild conditions.</p>
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Improving Palladium Catalyzed C–H Activation Methodologies Towards Industrial Applicability
… of arenes, as a complementary method to electrophilic aromatic substitution approaches. We aspire that the chapters presented will encourage further development and improvement of C–H activation methodologies, for practical deployment in industrial settings.
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The Rich Chemistry of Cyclotriveratrylene (CTV) And CT-Inspired Reactions: Anthracenes with Organic Light-Emitting Diode (OLED) Applications and the Discovery of Cascade Reactions
… a</p><p>Beckmann rearrangement followed by an electrophilic aromatic addition, two classic reactions that have never been seen combined into a powerful tandem sequence, enabling the direct construction of ketones, imines, or amines simply through varying the reaction conditions. We have now …
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CATALYTIC BORYLATION OF C-H BONDS: A ROUTE TO PHOTOPHYSICALLY INTERESTING PYRENE DERIVATIVES
… 1-, 3-, 6- and 8-positions, i.e. the sites of electrophilic aromatic substitution. In contrast, derivatives substituted at the 2- and 2,7-postions of pyrene are rare, as their syntheses involve laborious multistep processes. Such derivatives are of interest because they retain the long axis of …
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Reinventing Aromatic Substitution: A Novel Look
<p>Electrophilic aromatic substitution (EAS) and directed <em>ortho</em>-metalation (DoM) involve the direct substitution of an arene hydrogen. A major drawback involving EAS is the necessity for harsh forcing conditions for the reaction to proceed. Catalysts such as Lewis acids FeBr<sub>3</sub> …
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Structure-Property Relationships in the Design of High Performance Membranes for Water Desalination, Specifically Reverse Osmosis, Using Sulfonated Poly(Arylene Ether Sulfone)s
… consists of an interfacially polymerized aromatic polyamide thin film composite with a polysulfone porous backing that allows water to pass through while barring the transport of salt ions. This research focuses on the development of sulfonated poly(arylene ether sulfone) derivatives with …
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Synthesis Of N-Acetyl And C-Tert-Butyl Natural Amino Acid Substrates That Mimic Residues Of Polypeptides And Their Reactivity With [feiv(o)(n4py)]2+: Kinetic And Mechanistic Investigations
… for their reaction with [FeIV(O)(N4Py)]2+. An electrophilic aromatic substitution mechanism is suggested for the mechanism of the reaction of the substrate derived from Phe with [FeIV(O)(N4Py)]2+.</p> <p>The second chapter focuses on the oxidation of glutathione by metal-based oxidants, both …
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Regiospecific Synthesis of Ortho Substituted Phenols
<p>Phenol is highly reactive toward electrophilic aromatic substitution. By this general approach, many groups can be appended to the ring, via halogenation, acylation, sulfonation, and other processes. Phenol contains the hydroxyl group (–OH), which is a strongly activating ortho/para directing …
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Fundamental Investigations of Mechanistic Pathways of Selected Organic Reactive Intermediates
… plays in the formation of it -complexes in electrophilic aromatic substitution. Using commercial and synthetic compounds of varying it-electron density, the fact that % -complexes actually exist in these species was determined by a mass spectral investigation that was designed to monitor …
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New Pd and Cu-based catalysts for carbon-heteroatom bond formation
… chlorides that are not accessible via electrophilic aromatic substitution pathways and under mild reaction conditions. Additionally, this methodology points to an unprecedented selectivity for the phenylchlorosulfate electrophiles used in the cross-coupling reactions. Part II. Chapter …
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Chemistry of fused-ring iridabenzenes
Metalla-analogues of archetypical aromatic compounds have been attracting a great deal of interest in recent years. Metallabenzenes, where a methine unit in benzene has been formally replaced by a transition metal and its ancillary ligands, are a well-studied example which fall into this class. …
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High Performance Disulfonated Poly(arylene Sulfone) Co- and Terpolymers For Proton Exchange Membranes For Fuel Cell And Transducer Applications: Synthesis, Characterization And Fabrication Of Ion Conducting Membranes
… Nafion perfluorosulfonic acid membrane. Direct aromatic nucleophilic substitution polycondensations of disodium 3,3′ S-disulfonate-4,4′ S-difluorodiphenylsulfone (SDFDPS), 4,4′ S-difluorodiphenylsulfone (DFDPS) (or their chlorinated analogs, SDCDPS, DCDPS) and 4,4′ S-thiobisbenzenethiol (TBBT) …