Crampton, Michael R. and Emokpae, Thomas A. and Isanbor, Chukwuemeka (2006) 'Electronic and steric effects in the SNAr substitution reactions of substituted anilines with 2,4-dinitrophenyl 2,4,6-trinitrophenyl ether in acetonitrile.', Journal of physical organic chemistry., 19 (1). pp. 75-80.
Rate measurements are reported for the reactions of 12 ring-substituted anilines with 2,4-dinitrophenyl 2,4,6-trinitrophenyl ether (1) in acetonitrile. Formation of the products, the correspondingly substituted 2,4,6-trinitrodiphenylamines, occurs without the observation of intermediates in detectable amounts by both base-catalysed and uncatalysed pathways and Hammett value were determined for these processes. The results show that although substituents at the 3- or 4-positions of the anilines have only small steric effects, alkyl substituents at the 2-position may result in considerable reductions in reactivity. These effects are more pronounced for the base-catalysed pathway and in 2,6-dimethylaniline the uncatalysed pathway takes all the reaction flux. In the case of the 2-fluoro substituent the electronic effect, strong inductive electron withdrawal, is dominant over steric effects.
|Keywords:||SNAr substitution reactions, Anilines, 2,4-dinitrophenyl 2,4,6-trinitrophenyl ether, Electronic effects, Steric effects.|
|Full text:||Full text not available from this repository.|
|Publisher Web site:||https://doi.org/10.1002/poc.997|
|Record Created:||26 Apr 2007|
|Last Modified:||15 Feb 2018 15:14|
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