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|Type:||Artigo de periódico|
|Title:||The Sn Mechanism In Aromatic Compounds. Part 41.1 Thermochemical Calculations And Experimental Measurements Of Methanolysis Of 1-fluoro-2,4-dinitrobenzene, Picryl Chloride, And Picryl Fluoride|
|Abstract:||Rates and Arrhenius parameters for methanolysis of 1-fluoro-2,4- dinitrobenzene, picryl chloride, and picryl fluoride have been determined, and shown to be in satisfactory agreement with the results of a fundamental method of thermochemical calculation successfully applied previously to a wide range of SNAr reactions. These calculations also shed light on the sources of the large difference in nucleophilic strength of OMe- and MeOH. selected for the comparison of anionic and neutral forms of a nucleophile. The experimental results also lead to a comparison of the leaving group mobility of F and Cl in reactions with MeOH as nucleophile : as well as the activating power of an o-NO2 group, when there is an NO2 group in the other ortho-position. In the reaction of picryl chloride, the secondary reaction between product chloride ion and picryl methyl ether (demethylation) was avoided by carrying out the reaction in the presence of silver ion.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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