Results 141 to 150 of about 597,655 (179)
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Nucleophilic aromatic substitution reactions
Tetrahedron, 1966Abstract One- and two-step mechanisms for nucleophilic aromatic substitution reactions are discussed by means of a molecular orbital treatment, in a modified Huckel approximation. A correlation between experimental and theoretical activation energies was found for reactions of fluoro-, chloro-, bromo-benzenes and -naphthalenes carrying one or two ...
S. Carrà, M. Raimondi, M. Simonetta
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Aromatic nucleophilic substitution—II
Tetrahedron, 1973Abstract The intermediates in the reactions of 2,4-dinitro-(2) or 2,4,5-trinitro-1-naphthyl ethyl ether (11) with secondary amines have been studied. In the reaction of 2 with piperidine, the NMR spectrum of the reaction system indicated the coexistence of the three species-starting material, Meisenheimer complex, and substituted product.
S. Sekiguchi +4 more
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Helvetica Chimica Acta, 1975
AbstractThe kinetics of the SNAr reactions of aniline and N‐methylaniline with a variety of substituted nitrochlorobenzenes in acetonitrile demonstrate that the formation of the intermediate σ‐complex is rate determining. The ratio of the rate constants of the aniline and the N‐methylaniline reactions (kA/kM) increases with increasing size of the 6 ...
Walter Eggimann +2 more
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AbstractThe kinetics of the SNAr reactions of aniline and N‐methylaniline with a variety of substituted nitrochlorobenzenes in acetonitrile demonstrate that the formation of the intermediate σ‐complex is rate determining. The ratio of the rate constants of the aniline and the N‐methylaniline reactions (kA/kM) increases with increasing size of the 6 ...
Walter Eggimann +2 more
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Synthesis of Polynitroxides Based on Nucleophilic Aromatic Substitution
Organic Letters, 2010The scope and limitations of the synthesis of polynitroxides by nucleophilic substitution of electron-deficient fluorinated aromatic compounds are described. The method provides a facile route to the formation of polynitroxides exhibiting strong electron exchange between nitroxide groups.
Olaf, Zeika +6 more
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Nucleophilic substitution in aromatic systems
Journal of Chemical Education, 1955Classifies and examines various categories of nucleophilic substitution in aromatic systems.
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Dynamic self-correcting nucleophilic aromatic substitution
Nature Chemistry, 2018Dynamic covalent chemistry, with its ability to correct synthetic dead-ends, allows for the synthesis of elaborate extended network materials in high yields. However, the limited number of reactions amenable to dynamic covalent chemistry necessarily confines the scope and functionality of materials synthesized.
Wen Jie Ong, Timothy M. Swager
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Partially Fluorinated Tetraazaacenes by Nucleophilic Aromatic Substitution
The Journal of Organic Chemistry, 2013We report the sodium hydride-mediated reactions of a diethynylated diaminophenazine with perfluorobenzene, perfluoronaphthalene, and two octafluoroanthracene derivatives. In all of the cases, an N,N-dihydropyrazine ring is formed, and partially fluorinated tetraazapentacenes, tetraazahexacenes, and tetraazaheptacenes (in their respective N,N-dihydro ...
Jens U, Engelhart +4 more
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Radical-Nucleophilic Aromatic Substitution
2015Fil: Guastavino, Javier Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral.
Rossi, Roberto Arturo +2 more
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