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Moghazy YM, Hamada NMM, Fathalla MF, Elmarassi YR, Hamed EA, El-Atawy MA. Understanding the reaction mechanism of the regioselective piperidinolysis of aryl 1-(2,4-dinitronaphthyl) ethers in DMSO: Kinetic and DFT studies. PROGRESS IN REACTION KINETICS AND MECHANISM 2021. [DOI: 10.1177/14686783211027446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Reactions of aryl 1-(2,4-dinitronaphthyl) ethers with piperidine in dimethyl sulfoxide at 25oC resulted in substitution of the aryloxy group at the ipso carbon atom. The reaction was measured spectrophotochemically and the kinetic studies suggested that the titled reaction is accurately third order. The mechanism is began by fast nucleophilic attack of piperidine on C1 to form zwitterion intermediate (I) followed by deprotonation of zwitterion intermediate (I) to the Meisenheimer ion (II) in a slow step, that is, SB catalysis. The regular variation of activation parameters suggested that the reaction proceeded through a common mechanism. The Hammett equation using reaction constant σo values and Brønsted coefficient value showed that the reaction is poorly dependent on aryloxy substituent and the reaction was significantly associative and Meisenheimer intermediate-like. The mechanism of piperidinolysis has been theoretically investigated using density functional theory method using B3LYP/6-311G(d,p) computational level. The combination between experimental and computational studies predicts what mechanism is followed either through uncatalyzed or catalyzed reaction pathways, that is, SB and SB-GA. The global parameters of the reactants, the proposed activated complexes, and the local Fukui function analysis explained that C1 carbon atom is the most electrophilic center of ether. Also, kinetics and theoretical calculation of activation energies indicated that the mechanism of the piperidinolysis passed through a two-step mechanism and the proton transfer process was the rate determining step.
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Affiliation(s)
- Yasmen M Moghazy
- Chemistry Department, Faculty of Education, Alexandria University, Alexandria, Egypt
| | - Nagwa MM Hamada
- Chemistry Department, Faculty of Education, Alexandria University, Alexandria, Egypt
| | - Magda F Fathalla
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Yasser R Elmarassi
- Chemistry Department, Faculty of Education, Alexandria University, Alexandria, Egypt
- Basic Science Department, Imam Abdulrahman Bin Faisal University (Dammam University), Dammam, Kingdom of Saudi Arabia
| | - Ezzat A Hamed
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Mohamed A El-Atawy
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
- Chemistry Department, Faculty of Science, Taibah University, Yanbu, Saudi Arabia
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Moghazy YM, Fathalla MF, Hamada NMM, Elmarassi YR, Hamed EA. Experimental and theoretical approaches to the study of the reactivity and mechanism of the substitution of phenyl 1‐(2,4‐dinitronaphthyl) ether with anilines derivatives. INT J CHEM KINET 2020. [DOI: 10.1002/kin.21354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yasmen M. Moghazy
- Chemistry and Physics DepartmentFaculty of EducationAlexandria University Alexandria Egypt
| | - Magda F. Fathalla
- Chemistry DepartmentFaculty of ScienceAlexandria University Alexandria Egypt
| | - Nagwa M. M. Hamada
- Chemistry and Physics DepartmentFaculty of EducationAlexandria University Alexandria Egypt
| | - Yasser R. Elmarassi
- Chemistry DepartmentFaculty of ScienceAlexandria University Alexandria Egypt
- Basic Science DepartmentImam Abdulrahman Bin Faisal University (Dammam University) Dammam Kingdom of Saudi Arabia
| | - Ezzat A. Hamed
- Chemistry DepartmentFaculty of ScienceAlexandria University Alexandria Egypt
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Ibrahim MF, El-Atawy MA, El-Sadany SK, Hamed EA. Anilinolysis of Picryl Benzoate Derivatives in Methanol: Reactivity, Regioselectivity, Kinetics, and Mechanism. INT J CHEM KINET 2013. [DOI: 10.1002/kin.20779] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mahmoud F. Ibrahim
- Chemistry Department; Faculty of Science, Alexandria University; Alexandria 21321 Egypt
| | - Mohamed A. El-Atawy
- Chemistry Department; Faculty of Science, Alexandria University; Alexandria 21321 Egypt
| | - Samir K. El-Sadany
- Chemistry Department; Faculty of Science, Alexandria University; Alexandria 21321 Egypt
| | - Ezzat A. Hamed
- Chemistry Department; Faculty of Science, Alexandria University; Alexandria 21321 Egypt
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