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Showing 1 to 20 of 37 for “"Photoredox Catalysis"”.
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Accessing Challenging Fluorinated Motifs Using Photoredox Catalysis And Enabling Technologies
… functionalization of complex molecules. Photoredox catalysis invites a paradigm shift in the understanding of our capabilities to access diverse gem-difluoroalkene-containing small molecules because of its characteristically mild reaction conditions. Net-neutral radical/polar crossover, a …
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Development of New Organic Photoredox Catalysis Driven by Visible Light
… organic synthesis. In recent decades, organocatalysis has become one of the viable tools in organic synthesis with notable features including easy manipulation, low cost, and/or less susceptible to air and moisture. Organophotoredox catalysis has merged as a front runner in organocatalysis. …
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Rhodium-catalyzed asymmetric synthesis of beta-branched amides and gamma-branched amines and hydroaminomethylation of alkenes via photoredox catalysis
Embargo set by: Seth Robbins for item 109920 Lift date: 2021-02-08T18:43:54Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system
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Chiral acyl radicals generated by visible light enable stereoselective access to 3,3-disubstituted oxindoles: application toward the synthesis of (–)- and (+)-physovenine
… and environmentally friendly manner by way of photoredox catalysis, which uses a photocatalyst in conjunction with visible light (typically) to generate the necessary environment for radical generation under extremely mild conditions. This work outlines the development of a novel …
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Photoredox C–C Cross-Coupling Reactions using Boronic Acid Derivatives
In recent years, photoredox catalysis emerged as a privileged tool for small molecules activation via single-electron transfer mechanisms. Despite their ubiquity as reagents in organic synthesis, the use of boronic acid derivatives to generate carbon-centred radicals remains elusive. This …
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Excited-state organic chemistry: Tuning photoprotective and photoredox properties
… of photochemistry: photoprotection and photoredox catalysis. In the context of photoprotection, the synthesis, characterization and study of the properties of new photoprotective molecules against solar radiation are presented. Additionally, mechanistic investigations of photoredox …
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Photoredox activation of carbon dioxide and unactivated aliphatic carbonyl compounds
Chapter 1: Photoredox Activation of Carbon Dioxide for Amino Acid Synthesis in Continuous Flow. Although carbon dioxide (CO₂ ) is highly abundant, its low reactivity has limited its use in chemical synthesis. In particular, methods for carbon-carbon bond formation generally rely on two-electron …
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Greener Photoredox-Catalyzed Phosphonations of Aryl Halides
… natural products, agrichemicals, catalysis, and materials science. While a variety of aromatic precursors have been used to access these motifs, aryl halides remain one of the most desirable coupling partners owing to their low cost, commercial availability, and regioselective …
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I. Development of three-component alkene carboamination reactions II. Palladium-catalyzed anti-Markovnikov oxidative amination of alkenes III. Chloroform as a carbon monoxide precursor: in or ex situ generation of co for pd-catalyzed carbonylations IV. Hydroalkylation of alkenes via photoredox catalysis
The design of methods that streamline the synthesis of small organic molecules is a critical facet of organic chemistry, impacting core scientific fields with important societal implications. In the medical sciences, for instance, the treatment of diseases is a major public health concern that …
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Photoredox activation of SF₆ for fluorination, on-demand automated titration of organometallic reagents in continuous flow, and progress toward an enantioselective synthesis of bedaquiline
Chapter 1: Photoredox Activation of SF₆ for Fluorination [chemical formula] We report the first practical use of SF₆ as a fluorinating reagent in organic synthesis. Photoredox catalysis enables the in situ conversion of SF6, an inert gas, into an active fluorinating species using visible light and …
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Iridium (III) photosensitisers for photoredox catalysed carboxylation reactions of ketimines
… energy to initiate chemical reactions. Photoredox catalysis has piqued great interest in this regard, creating a means for a milder energy source (visible light) to drive chemical reactions and thus revolutionising the field of synthetic radical chemistry and photochemistry. Recently, …
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CONTINUOUS-FLOW STRATEGIES FOR THE PREPARATION OF ACTIVE PHARMACEUTICAL INGREDIENTS AND RELEVANT INTERMEDIATES
… enabling technologies such as flow chemistry, photoredox catalysis, ultrasound, and electrochemistry. In the first part, palladium-catalyzed cross-coupling reactions involving highly reactive organolithium reagents are investigated under continuous-flow conditions, demonstrating how precise …
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The nickel-catalyzed Mizoroki-Heck reaction : high regioselectivity in Olefin migratory insertion and photoredox-enabled indoline formation
… formula and color illustrations ...] Nickel/photoredox catalysis is used to synthesize indolines in one step from iodoacetanilides and alkenes. Very high regioselectivity for 3-substituted indoline products is obtained for both aliphatic and styrenyl olefins. Mechanistic investigations …
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EXPLORING UNPRECEDENT SYNTHETIC ROUTES FOR CHIRAL AMINO DERIVATIVES
… amino derivatives through the integration of photoredox catalysis, organocatalysis, transition-metal catalysis, and continuous-flow chemistry. The work explores the synthetic potential of light-driven processes to access reactive open-shell intermediates under mild and sustainable conditions, …
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Part I: Design, synthesis, and studies of novel age-inhibitors and age-breakers; Part II: Novel synthetic methods for organofluorine compound
… compounds through the photoredox catalysis, using photocatalyst 9-fluorenone in the presence of visible light (household bulb 13W CFL). This reaction proceeds under mild conditions and is applicable to <em>gem</em>-difluorination of variously substituted diaryl …
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Development of Iridium Based Photosensitizer for Potent Photoreductants and Photocatalytic Application
… which function as potent photoreductants for photoredox catalysis. Chapter 1 describes the basic concepts of photosensitizers in photocatalysis and strategies to modify the photophysical and electrochemical properties via ligand modification with different types of photosensitizers. Chapter 2 …
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Modular Methods for the Synthesis of α-Tertiary and α-Branched Alkylamines via Visible-Light-Mediated Radical Generation
… In the first method, visible-light-mediated photoredox catalysis orchestrates the formation of α-tertiary amines from alkyl primary amines, alkyl ketones, and alkene acceptors. Over 50 new α-tertiary alkylamines are reported, displaying a range of structural and functional diversity in all …
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Carbon Nitride as a Heterogeneous Photocatalyst for Organic Transformations
… a key challenge in chemistry. Visible light photoredox catalysis has recently attracted wide attention as a versatile approach to perform numerous reactions under mild conditions, but progress has been mostly confined to homogeneous photocatalysts, especially precious Ir or Ru metal …
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Photochemical Methods for the Construction of C-C and C-X Bonds
… challenges with photochemistry, early work in photoredox catalysis and the application of continuous processing for photochemical reactions are three research chapters. Chapter 2 discloses the development of a photoredox-catalysed dehydrogenative cross-coupling reaction between aldehydes and …
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LIGHT AND ELECTRICITY: POWERFUL TOOLS FOR NEW SUSTAINABLE STEREOSELECTIVE SYNTHESIS
… in Chapter 1.2, as starting point to introduce Photoredox catalysis under homogeneous, heterogeneous and flow conditions. In addition, Chapter 1.3 shows a concise overview of electrophotocatalysis focusing on the difference between electrochemical mediated photoredox catalysis (e-PRC) and …
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