A Fast Radical Chain Mechanism in the Polyfluoroalkoxylation of Aromatics through NO<sub>2</sub> Group Displacement. Mechanistic and Theoretical Studies
作者:Ismael Tejero、Imma Huertas、Àngels González-Lafont、José M. Lluch、Jordi Marquet
DOI:10.1021/jo048354m
日期:2005.3.1
chain mechanism operates. This mechanism is elicited by oxidation of a Meisenheimercomplex and proceeds through a radical aromaticsubstitution with the polyfluoroalkoxy or the polyfluoroalkylthio radicals as key intermediates. At low concentrations, entrainment can be achieved with superoxide anion. A rationale for this effect is discussed. Answers to particular questions about the proposed mechanism
Synthesis of Fluorinated Alkyl Aryl Ethers by Palladium-Catalyzed C–O Cross-Coupling
作者:Robert Szpera、Patrick G. Isenegger、Maxime Ghosez、Natan J. W. Straathof、Rosa Cookson、David C. Blakemore、Paul Richardson、Véronique Gouverneur
DOI:10.1021/acs.orglett.0c02347
日期:2020.8.21
cross-coupling of (hetero)aryl bromides with fluorinated alcohols using the commercially available precatalyst tBuBrettPhos Pd G3 and Cs2CO3 in toluene. This Pd-catalyzed coupling features a short reaction time, excellent functional group tolerance, and compatibility with electron-rich and -poor (hetero)arenes. The method provides access to 18F-labeled trifluoroethyl ethers by cross-coupling with [
在本文中,我们报告了一种高效的方案,可使用市售的预催化剂t BuBrettPhos Pd G3和Cs 2 CO 3在甲苯中将(杂)芳基溴化物与氟化醇交叉偶联。这种钯催化的偶联反应具有反应时间短,对官能团的耐受性强以及与富电子和贫电子(杂)芳烃相容的特点。该方法通过与[ 18 F]三氟乙醇交叉偶联而获得18 F-标记的三氟乙基醚。
A Product Analytical Study of the Thermal and Photolytic Decomposition of Some Arenediazonium Salts in Solution
作者:Peter S. J. Canning、Howard Maskill、Katharine McCrudden、Brian Sexton
DOI:10.1246/bcsj.75.789
日期:2002.4
most solvents undergo unimolecular heterolysis to give singlet aryl cations which are captured by solvent. This mechanism is dominant for arenediazonium ions without electron-withdrawing substituents in all solvents, and the only reaction observed in water. Additionally, appreciable yields of fluoroarenes are obtained by fluoride abstraction by the aryl cation from fluorinated solvents and from tetrafluoroborate
Dediazoniation reactions of arenediazonium ions under solvolytic conditions: fluoride anion abstraction from trifluoroethanol and α-hydrogen atom abstraction from ethanol
作者:Peter S. J. Canning、Katharine McCrudden、Howard Maskill、Brian Sexton
DOI:10.1039/a804686g
日期:——
Arenediazonium salts decompose thermally and photochemically in trifluoroethanol to yield trifluoroethyl ethers and (in part by fluoride abstraction from the solvent) fluoroarenes; the less reactive compounds in trifluoroethanol decompose readily in ethanol to give arenes in a radical reaction involving abstraction of the α-hydrogen from the ethanol.
Etherification via Aromatic Substitution on 1,3-Disubstituted Benzene Derivatives
作者:Marina Tsuzaki、Shin Ando、Tadao Ishizuka
DOI:10.1021/acs.joc.1c02670
日期:2022.1.21
reactions such as aryl fluorides activated with either a bromide or a chloride substituent were aptly converted to corresponding ether products at 25 °C. This reaction would potentially be useful to link an alcohol to an additional functional group through further chemical transformations via the use of a residual bromide or chloride substituent.