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Al-Howsaway HO, Fathalla MF, El-Bardan AA, Hamed EA. Reaction of 4-Chloro-3,5-Dinitrobenzotrifluoride with Aniline Derivatives. Substituent Effects. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823407x240926] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
N-(2,6-Dinitro-4-trifluoromethylphenyl)aniline derivatives were prepared by anilino-dechlorination of 4-chloro-3, 5-dinitrobenzotrifluoride. IR, UV and 1H NMR studies suggested an intramolecular hydrogen bond between the amino hydrogen and one o-nitro group. An addition-elimination mechanism was suggested based on the second-order kinetics and the dependence of rates on the nature and the position of the substituent in the aniline ring, as well as the high negative values of ρ(-3.14, −3.16, −3.01). Such values indicate a positive charge on the aniline nitrogen in the transition state and that the rate is affected by the polar effect of the substituent. The β value (0.85 at 30°C) indicates an appreciable degree of bond formation in the transition state.
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Affiliation(s)
- Hamida O.M. Al-Howsaway
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Kingdom of Saudi Arabia
| | - Magda F. Fathalla
- Chemistry Department, Faculty of Science, Alexandria University, PO 426 Ibrahimia, Alexandria 21321, Egypt
| | - Ali A. El-Bardan
- Chemistry Department, Faculty of Science, Alexandria University, PO 426 Ibrahimia, Alexandria 21321, Egypt
| | - Ezzat A. Hamed
- Chemistry Department, Faculty of Science, Alexandria University, PO 426 Ibrahimia, Alexandria 21321, Egypt
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