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Cherkasov S, Parkhomenko D, Morozov D, Bagryanskaya E. A novel method of alkoxyamine homolysis activation via photochemical rearrangement. Phys Chem Chem Phys 2024; 26:9754-9762. [PMID: 38470838 DOI: 10.1039/d3cp05815h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
We proposed the nitrone-oxaziridine rearrangement as a novel method for photochemical activation for the homolysis of alkoxyamine in nitroxide-mediated polymerization. The photoisomerization of the aldo-/ketonitrone-group into the oxaziridine one in 2,5-dihydroimidazole 3-oxide-based alkoxyamines was studied; the products of photolysis have been identified, and quantum yields were measured. Conversion of the nitrone group into the oxaziridine one was found to decrease the activation energy of alkoxyamine homolysis by ca. 10 kJ mol-1.
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Affiliation(s)
- Sergey Cherkasov
- Novosibirsk State University, Pirogova 1, 630090, Novosibirsk, Russia.
| | - Dmitriy Parkhomenko
- Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentieva av. 9, 630090, Novosibirsk, Russia
| | - Denis Morozov
- Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentieva av. 9, 630090, Novosibirsk, Russia
| | - Elena Bagryanskaya
- Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentieva av. 9, 630090, Novosibirsk, Russia
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Qian B, Zhang L, Zhang G, Fu Y, Zhu X, Shen G. Thermodynamic Evaluation on Alkoxyamines of TEMPO Derivatives, Stable Alkoxyamines or Potential Radical Donors? ChemistrySelect 2022. [DOI: 10.1002/slct.202204144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- Bao‐Chen Qian
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
| | - Lu Zhang
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
| | - Gao‐Shuai Zhang
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
| | - Yan‐Hua Fu
- College of Chemistry and Environmental Engineering Anyang Institute of Technology Anyang Henan 455000 P. R. China
| | - Xiao‐Qing Zhu
- The State Key Laboratory of Elemento-Organic Chemistry Department of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Guang‐Bin Shen
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
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Cherkasov S, Parkhomenko D, Genaev A, Salnikov G, Edeleva M, Morozov D, Rybalova T, Kirilyuk I, Marque SRA, Bagryanskaya E. NMR and EPR Study of Homolysis of Diastereomeric Alkoxyamines. Molecules 2020; 25:E5080. [PMID: 33139669 PMCID: PMC7663419 DOI: 10.3390/molecules25215080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 10/28/2020] [Accepted: 10/30/2020] [Indexed: 12/03/2022] Open
Abstract
Three alkoxyamines based on imidazoline radicals with a pyridine functional group-potential initiators of nitroxide-mediated, controlled radical polymerization-were synthesized. Electron Paramagnetic Resonance (EPR) measurements reveal biexponential kinetics for the thermolysis for diastereomeric alkoxyamines and monoexponential kinetics for an achiral alkoxyamine. For comparison, the thermolysis of all three alkoxyamines was studied by NMR in the presence of three different scavengers, namely tetramethylpiperidine-N-oxyl (TEMPO), thiophenol (PhSH), and β-mercaptoethanol (BME), and detailed analysis of products was performed. NMR differentiates between N-inversion, epimerization, and homolysis reactions. The choice of scavenger is crucial for making a reliable and accurate estimate of the true homolysis rate constant.
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Affiliation(s)
- Sergey Cherkasov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
- National Research University—Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Dmitriy Parkhomenko
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
| | - Alexander Genaev
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
| | - Georgii Salnikov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
| | - Mariya Edeleva
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
| | - Denis Morozov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
| | - Tatyana Rybalova
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
| | - Igor Kirilyuk
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
| | - Sylvain R. A. Marque
- Aix Marseille Univ, CNRS, ICR, UMR 7273, case 551, Avenue Escadrille Normandie-Niemen, 13397 Marseille CEDEX 20, France;
| | - Elena Bagryanskaya
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia; (S.C.); (D.P.); (A.G.); (G.S.); (M.E.); (D.M.); (T.R.); (I.K.)
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