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Search for "pyrylium salts" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.

Redox-active molecules as organocatalysts for selective oxidative transformations – an unperceived organocatalysis field

Elena R. Lopat’eva,
Igor B. Krylov,
Dmitry A. Lapshin and
Alexander O. Terent’ev

Beilstein J. Org. Chem. 2022, 18, 1672–1695, doi:10.3762/bjoc.18.179

][29] and specialized on the specific types of organophotoredox catalysts, such as quinone derivatives [30][31], carbon nitrides [32][33], eosin [34][35][36], 4CzIPN [37][38], Bodipy derivatives [39], methylene blue [40], pyrylium salts [41], and perylene diimides [42]. Photochemical processes

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Graphical Abstract

Scheme 1: Organocatalysis classification used in the present perspective.

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Scheme 2: Oxidative processes catalyzed by amines.

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Scheme 3: N-Heterocyclic carbene (NHC) catalysis in oxidative functionalization of aldehydes.

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Scheme 4: Examples of asymmetric oxidative processes catalyzed by chiral Brønsted acids.

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Scheme 5: Asymmetric aerobic α-hydroxylation of lactams under phase-transfer organocatalysis conditions emplo...

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Scheme 6: Selective CH-oxidation of methylarenes to aldehydes or carboxylic acids.

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Scheme 7: An example of the regioselective CH-amination by a sterically hindered imide-N-oxyl radical precurs...

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Scheme 8: CH-amination of ethylbenzene and CH-fluorination of aldehydes catalyzed by N-hydroxybenzimidazoles,...

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Scheme 9: Mixed hetero-/homogeneous TiO₂/N-hydroxyimide photocatalysis in the selective benzylic oxidation.

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Scheme 10: Electrochemical benzylic iodination and benzylation of pyridine by benzyl iodides generated in situ...

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Scheme 11: Electrochemical oxidative C–O/C–N coupling of alkylarenes with NHPI. Electrolysis conditions: Const...

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Scheme 12: Chemoselective alcohol oxidation catalyzed by TEMPO.

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Scheme 13: ABNO-catalyzed oxidative C–N coupling of primary alcohols with primary amines.

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Scheme 14: ACT-catalyzed electrochemical oxidation of primary alcohols and aldehydes to carboxylic acids.

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Scheme 15: Electrocatalytic oxidation of benzylic alcohols by a TEMPO derivative immobilized on a graphite ano...

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Scheme 16: Electrochemical oxidation of carbamates of cyclic amines to lactams and oxidative cyanation of amin...

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Scheme 17: Hydrogen atom transfer (HAT) and single-electron transfer (SET) as basic principles of amine cation...

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Scheme 18: Electrochemical quinuclidine-catalyzed oxidation involving unactivated C–H bonds.

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Scheme 19: DABCO-mediated photocatalytic C–C cross-coupling involving aldehyde C–H bond cleavage.

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Scheme 20: DABCO-derived cationic catalysts in inactivated C–H bond cleavage for alkyl radical addition to ele...

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Scheme 21: Electrochemical diamination and dioxygenation of vinylarenes catalyzed by triarylamines.

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Scheme 22: Electrochemical benzylic oxidation mediated by triarylimidazoles.

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Scheme 23: Thiyl radical-catalyzed CH-arylation of allylic substrates by aryl cyanides.

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Scheme 24: Synthesis of redox-active alkyl tetrafluoropyridinyl sulfides by unactivated C–H bond cleavage by t...

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Scheme 25: Main intermediates in quinone oxidative organocatalysis.

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Scheme 26: Electrochemical DDQ-catalyzed intramolecular dehydrogenative aryl–aryl coupling.

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Scheme 27: DDQ-mediated cross-dehydrogenative C–N coupling of benzylic substrates with azoles.

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Scheme 28: Biomimetic o-quinone-catalyzed benzylic alcohol oxidation.

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Scheme 29: Electrochemical synthesis of secondary amines by oxidative coupling of primary amines and benzylic ...

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Scheme 30: General scheme of dioxirane and oxaziridine oxidative organocatalysis.

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Scheme 31: Dioxirane organocatalyzed CH-hydroxylation involving aliphatic C(sp³)–H bonds.

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Scheme 32: Enantioselective hydroxylation of CH-acids catalyzed by chiral oxaziridines.

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Scheme 33: Iodoarene-organocatalyzed vinylarene diamination.

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Scheme 34: Iodoarene-organocatalyzed asymmetric CH-hydroxylation of benzylic substrates.

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Scheme 35: Iodoarene-organocatalyzed asymmetric difluorination of alkenes with migration of aryl or methyl gro...

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Scheme 36: Examples of 1,2-diiodo-4,5-dimethoxybenzene-catalyzed electrochemical oxidative heterocyclizations.

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Scheme 37: Electrochemical N-ammonium ylide-catalyzed CH-oxidation.

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Scheme 38: Oxidative dimerization of aryl- and alkenylmagnesium compounds catalyzed by quinonediimines.

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Scheme 39: FLP-catalyzed dehydrogenation of N-substituted indolines.

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Perspective

Published 09 Dec 2022

Full text

Electron self-exchange activation parameters of diethyl sulfide and tetrahydrothiophene

Martin Goez and
Martin Vogtherr

Beilstein J. Org. Chem. 2013, 9, 1448–1454, doi:10.3762/bjoc.9.164

solvent reorganization. Keywords: CIDNP; electron transfer; free radicals; kinetics; photochemistry; pyrylium salts; self-exchange; sulfides; Introduction Single-electron transfer is probably the simplest chemical process of an organic molecule, because usually no full bonds are broken or formed. For

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