1
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Duggin M, Olivier WJ, Canty AJ, Lim LF, Cox N, Turner GF, Moggach SA, Thickett SC, Bissember AC, Fuller RO. Lawesson's Reagent: Providing a New Approach to the Forgotten 6-Thioverdazyl Radical. J Org Chem 2024; 89:9405-9419. [PMID: 38865165 DOI: 10.1021/acs.joc.4c00690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
A new method for the preparation of the underrepresented 1,5-dimethyl-6-thioverdazyl radicals has been developed employing Lawesson's reagent (LR). The synthetic route involves the direct thionation of the carbonyl group of the corresponding dialkylbishydrazone followed by cyclization to give the tetrazinanthione verdazyl precursor on a gram scale. Subsequent oxidation yields the 6-thioverdazyl radical. It was determined that thionation of substrates containing electron-withdrawing groups in the ortho- or para-positions was high yielding. In contrast, for the parent phenyl group or substrates bearing weakly electron-donating substituents, thionation efficiency was significantly reduced. This could be overcome by utilizing partial in situ cyclization, which occurs during work up, to generate the tetrazinanthione directly via a one-pot synthesis. Density functional theory suggests that the LR fragment interacts with the carbonyl prior to cycloaddition and subsequent to cycloreversion, leading to the thiocarbonyl. The electronic nature of the radical is characterized with electron paramagnetic resonance as well as the first report of 6-thioverdazyl redox properties.
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Affiliation(s)
- Margot Duggin
- School of Natural Sciences─Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Wesley J Olivier
- School of Natural Sciences─Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Allan J Canty
- School of Natural Sciences─Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Li Feng Lim
- Research School of Chemistry, The Australia National University, Canberra, Australian Capital Territory 2601, Australia
| | - Nicholas Cox
- Research School of Chemistry, The Australia National University, Canberra, Australian Capital Territory 2601, Australia
| | - Gemma F Turner
- School of Molecular Sciences─Chemistry, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Stephen A Moggach
- School of Molecular Sciences─Chemistry, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Stuart C Thickett
- School of Natural Sciences─Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Alex C Bissember
- School of Natural Sciences─Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Rebecca O Fuller
- School of Natural Sciences─Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
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2
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Votkina DE, Rollet M, Trusova ME, Audran G, Marque SRA, Petunin PV, Postnikov PS. 2,4,5,6-Substituted 4,5-dihydro-1,2,4,5-tetrazin-3(2H)-ones as non-classical initiators of controlled radical polymerization of styrene. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3563-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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Zhou D, Zhu LW, Wu BH, Xu ZK, Wan LS. End-functionalized polymers by controlled/living radical polymerizations: synthesis and applications. Polym Chem 2022. [DOI: 10.1039/d1py01252e] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
This review focuses on end-functionalized polymers synthesized by controlled/living radical polymerizations and the applications in fields including bioconjugate formation, surface modification, topology construction, and self-assembly.
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Affiliation(s)
- Di Zhou
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Liang-Wei Zhu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Bai-Heng Wu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Zhi-Kang Xu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Ling-Shu Wan
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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4
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Fuller RO, Taylor MR, Duggin M, Bissember AC, Canty AJ, Judd MM, Cox N, Moggach SA, Turner GF. Enhanced synthesis of oxo-verdazyl radicals bearing sterically-and electronically-diverse C3-substituents. Org Biomol Chem 2021; 19:10120-10138. [PMID: 34757372 DOI: 10.1039/d1ob01946e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthetic viability of the hydrazine- and phosgene-free synthesis of 1,5-dimethyl oxo-verdazyl radicals has been improved via a detailed study investigating the influence of the aryl substituent on tetrazinanone ring formation. Although it is well established that functionalisation at the C3 position of the tetrazinanone ring does not influence the nature of the radical, it is crucial in applications development. The synthetic route involves a 4-step sequence: Schiff base condensation of a carbohydrazide with an arylaldehyde, alkylation, ring closure then subsequent oxidation to the radical. We found that the presence of strong electron-donating substituents and electron rich heterocycles, result in a significant reduction in yield during both the alkylation and ring closure steps. This can, in part, be alleviated by milder alkylation conditions and further substitution of the aryl group. In comparison, more facile formation of the tetrazine ring was observed with examples containing electron-withdrawing groups and with meta- or para-substitution. Density functional theory suggests that the ring closure proceeds via the formation of an ion pair. Electron paramagnetic resonance spectroscopy provides insight into the precise electronic structure of the radical with small variations in hyperfine coupling constants revealing subtle differences.
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Affiliation(s)
- Rebecca O Fuller
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania, Australia.
| | - Madeleine R Taylor
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania, Australia.
| | - Margot Duggin
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania, Australia.
| | - Alex C Bissember
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania, Australia.
| | - Allan J Canty
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania, Australia.
| | - Martyna M Judd
- Research School of Chemistry, The Australia National University, Australian Capital Territory, Australia
| | - Nicholas Cox
- Research School of Chemistry, The Australia National University, Australian Capital Territory, Australia
| | - Stephen A Moggach
- School of Molecular Sciences - Chemistry, The University of Western Australia, Crawley, Western Australia, Australia
| | - Gemma F Turner
- School of Molecular Sciences - Chemistry, The University of Western Australia, Crawley, Western Australia, Australia
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5
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Chahma M, Riopel R, Arteca G. Synthesis, characterization and modeling of stable radical functionalized monothiophenes. J Sulphur Chem 2021. [DOI: 10.1080/17415993.2021.1909590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- M’hamed Chahma
- Department of Chemistry & Biochemistry, Laurentian University, Sudbury, Canada
| | - Remi Riopel
- Department of Chemistry & Biochemistry, Laurentian University, Sudbury, Canada
| | - Gustavo Arteca
- Department of Chemistry & Biochemistry, Laurentian University, Sudbury, Canada
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6
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Votkina DE, Petunin PV, Trusova ME, Postnikov PS, Audran G, Marque SRA. Kinetic investigation of thermal and photoinduced homolysis of alkylated verdazyls. Phys Chem Chem Phys 2020; 22:21881-21887. [PMID: 32968753 DOI: 10.1039/d0cp03151h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The on-demand generation of stable organic radicals from the precursors can be considered as an essential challenge for the plethora of applications in various fields of science. In this contribution, we prepared a range of N-(methyl)benzyl derivatives of 6-oxoverdazyl via atom transfer radical addition from moderate to high yields and studied their thermal- and photo-initiated homolysis. The kinetics of homolysis was measured, and the dissociating rate constant kd, activation energy Ea and frequency factor A were estimated. Variation of the substituent at the C3-position of the verdazyl ring was successfully applied for fine-tuning the homolysis rate: the value of kd was higher for alkylverdazyls with electron-withdrawing groups, e.g., the para nitro group afforded a 6-fold increase in kd. In contrast to thermal homolysis, the rate of photoinduced decomposition depends on both the extinction coefficient and the value of activation energy. Thus, nitro-containing alkylated verdazyls show the highest homolysis rate in both types of initiations. The achieved results afford a novel opportunity in the controlled generation of verdazyls and further application of these compounds in medicine and chemical industry.
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Affiliation(s)
- Darya E Votkina
- Research School of Chemistry & Applied Biomedical Sciences, Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russia.
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7
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Gopinath P, Chandrasekaran S. A Sequential One-Pot Synthesis of Functionalized Esters and Thioesters through a Ring-Opening Acylation of Cyclic Ethers and Thioethers. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801225] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Purushothaman Gopinath
- Department of Organic Chemistry; Indian Institute of Science; 560012 Bangalore India
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); 517507 Tirupati, Tirupati India
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8
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Valiev RR, Drozdova AK, Petunin PV, Postnikov PS, Trusova ME, Cherepanov VN, Sundholm D. The aromaticity of verdazyl radicals and their closed-shell charged species. NEW J CHEM 2018. [DOI: 10.1039/c8nj04341h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The aromaticity of fourteen 3-oxo-verdazyl (1–8) and Kuhn verdazyl (9–14) radicals with different substituents has been investigated computationally using the gauge-including magnetically induced current-density (GIMIC) method.
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Affiliation(s)
- Rashid R. Valiev
- Tomsk State University
- Tomsk
- Russian Federation
- Department of Chemistry
- University of Helsinki
| | | | - Pavel V. Petunin
- Tomsk Polytechnic University
- Tomsk 634050
- Russian Federation
- Siberian State Medical University
- Tomsk 634050
| | - Pavel S. Postnikov
- Tomsk Polytechnic University
- Tomsk 634050
- Russian Federation
- Department of Solid State Engineering, University of Chemistry and Technology
- Prague
| | | | | | - Dage Sundholm
- Department of Chemistry
- University of Helsinki
- Helsinki FIN-00014
- Finland
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9
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Areephong J, Mattson KM, Treat NJ, Poelma SO, Kramer JW, Sprafke HA, Latimer AA, Read de Alaniz J, Hawker CJ. Triazine-mediated controlled radical polymerization: new unimolecular initiators. Polym Chem 2016. [DOI: 10.1039/c5py01563d] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Triazine-based unimolecular initiators are shown to mediate the controlled radical polymerization of several monomer classes, yielding polymers with low dispersities, targeted molecular weights, and active chain ends.
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Affiliation(s)
- J. Areephong
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
| | - K. M. Mattson
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
- Department of Chemistry and Biochemistry
| | - N. J. Treat
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
- Materials Department
| | - S. O. Poelma
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
- Department of Chemistry and Biochemistry
| | | | - H. A. Sprafke
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
| | - A. A. Latimer
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
- Department of Chemistry and Biochemistry
| | - J. Read de Alaniz
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
- Department of Chemistry and Biochemistry
| | - C. J. Hawker
- Materials Research Laboratory
- University of California
- Santa Barbara
- USA
- Department of Chemistry and Biochemistry
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10
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Ballard N, Mecerreyes D, Asua JM. Redox Active Compounds in Controlled Radical Polymerization and Dye-Sensitized Solar Cells: Mutual Solutions to Disparate Problems. Chemistry 2015; 21:18516-27. [PMID: 26449200 DOI: 10.1002/chem.201503098] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Controlled radical polymerization (CRP) and dye-sensitized solar cells (DSSCs) are two fields of research that at an initial glance appear to have little in common. However, despite their obvious differences, both in application and in scientific nature, a closer look reveals a striking similarity between many of the compounds widely used as control agents in radical polymerization and as redox couples in dye-sensitized solar cells. Herein, we review the various redox active compounds used and examine the characteristics that give them the ability to perform this dual function. In addition we explore the advances in the understanding of the structural features that enhance their activity in both CRP and DSSCs. It is hoped that such a comparison will be conducive to improving process performance in both fields.
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Affiliation(s)
- Nicholas Ballard
- POLYMAT and Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, Donostia-San Sebastián, 20018 (Spain).
| | - David Mecerreyes
- POLYMAT and Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, Donostia-San Sebastián, 20018 (Spain)
| | - José M Asua
- POLYMAT and Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, Donostia-San Sebastián, 20018 (Spain)
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11
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Johnston CW, Schwantje TR, Ferguson MJ, McDonald R, Hicks RG. Metal coordination, and metal-ligand redox non-innocence, modulates allosteric C-N bond homolysis in an N-benzyl tetrazine. Chem Commun (Camb) 2014; 50:12542-4. [PMID: 25196495 DOI: 10.1039/c4cc06235c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Remote coordination of a Ru(hfac)2 moiety to a chelating N-benzyl tetrazine lowers the C-N homolytic bond dissociation enthalpy by approximately 20 kJ mol(-1). The significant bond strength perturbation is believed to arise as a consequence of metal-ligand redox non-innocence.
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Affiliation(s)
- Cooper W Johnston
- Department of Chemistry, University of Victoria, PO Box 3065 STN CSC, Victoria, BC V8W3V6, Canada.
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12
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Price JT, Paquette JA, Harrison CS, Bauld R, Fanchini G, Gilroy JB. 6-Oxoverdazyl radical polymers with tunable electrochemical properties. Polym Chem 2014. [DOI: 10.1039/c4py00829d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
6-Oxoverdazyl radical polymers were synthesized and their tunable redox properties studied in solution and the solid-state.
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Affiliation(s)
- Jacquelyn T. Price
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Joseph A. Paquette
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Christopher S. Harrison
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Reg Bauld
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London N6A 5B7, Canada
- Department of Physics and Astronomy
- The University of Western Ontario
| | - Giovanni Fanchini
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London N6A 5B7, Canada
- Department of Physics and Astronomy
- The University of Western Ontario
| | - Joe B. Gilroy
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
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13
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Demetriou M, Berezin AA, Koutentis PA, Krasia-Christoforou T. Benzotriazinyl-mediated controlled radical polymerization of styrene. POLYM INT 2013. [DOI: 10.1002/pi.4566] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Maria Demetriou
- Department of Mechanical and Manufacturing Engineering; University of Cyprus; PO Box 20537 1678 Nicosia Cyprus
| | - Andrey A. Berezin
- Department of Chemistry; University of Cyprus; PO Box 20537 1678 Nicosia Cyprus
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