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El complejo de Meisenheimer es un intermediario de carga negativa formado durante la reacción de sustitución nucleofílica aromática. Su descubrimiento por el científico alemán Eberhard Meisenheimer ha desempeñado un papel fundamental en la comprensión de las reacciones químicas que ocurren en los compuestos orgánicos.
A Meisenheimer complex or Jackson–Meisenheimer complex in organic chemistry is a 1:1 reaction adduct between an arene carrying electron withdrawing groups and a nucleophile. These complexes are found as reactive intermediates in nucleophilic aromatic substitution but stable and isolated Meisenheimer salts are also known.
A Meisenheimer complex is a negatively charged intermediate formed by the attack of a nucleophile upon one of the aromatic-ring carbons during the course of a nucleophilic aromatic substitution reaction. A typical Meisenheimer complex is shown in the reaction scheme below.
16 de jul. de 2018 · The Meisenheimer model for predicting the principal site of for nucleophilic substitution in aromatic perfluorocarbons—generalization to include ring-nitrogen atoms and non-fluorine ring ...
- Eugene E. Kwan, Yuwen Zeng, Harrison A. Besser, Eric N. Jacobsen
- 2018
Meisenheimer complexes are important intermediates in Nucleophilic Aromatic Substitution Reactions (SNAr). They are formed by the addition of electron rich species to polynitro aromatic compounds or aromatic compounds with strong electron withdrawing groups.
- Rabih O. Al-Kaysi, Iluminada Gallardo, Gonzalo Guirado
- 2008
1 de ene. de 2014 · Also known as the Meisenheimer–Jackson salt, the stable intermediate for certain SNAr reactions.
15 de oct. de 2018 · Anionic σ-complexes, best known as Meisenheimer complexes, have long been assumed to be intermediates in S N Ar reactions. New evidence now suggests that these intermediates may only be formed in select cases and that a concerted pathway is more common.
