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1
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Sharp-Bucknall L, Sceney M, White KF, Dutton JL. Synthesis, structural characterization, reactivity and catalytic activity of mixed halo/triflate ArI(OTf)(X) species. Dalton Trans 2023; 52:3358-3370. [PMID: 36809478 DOI: 10.1039/d3dt00275f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Both mixed λ3-iodoarenes and λ3-iodoarenes possessing -OTf ligands are coveted for their enhanced reactivities. Here we describe the synthesis, reactivity, and comprehensive characterisation of two new ArI(OTf)(X) species, a class of compound that were previously only invoked as reactive intermediates where X = Cl, F and their divergent reactivity with aryl substrates. A new catalytic system for electrophilic chlorination of deactivated arenes using Cl2 as the chlorine source and ArI/HOTf as the catalyst is also described.
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Affiliation(s)
| | - Marcus Sceney
- Department of Chemistry, La Trobe University, Melbourne, Victoria, Australia.
| | - Keith F White
- Department of Chemistry, La Trobe University, Melbourne, Victoria, Australia.
| | - Jason L Dutton
- Department of Chemistry, La Trobe University, Melbourne, Victoria, Australia.
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2
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Davis BA, Tania, Dutton JL. Kinetic study on the activation of PhICl 2 with Lewis bases for aromatic chlorination. Dalton Trans 2022; 51:12384-12388. [PMID: 35912852 DOI: 10.1039/d2dt01842j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A study on the kinetics of the activation of PhICl2 using catalytic chloride or pyridine in electrophilic chlorination of arenes has been carried out. The results indicate that both catalysts induce the release of Cl2 from PhICl2 and that the Cl2 is the active reagent for chlorination in these reactions.
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Affiliation(s)
- Benjamin A Davis
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Tania
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Jason L Dutton
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
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3
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Dai PF, Xu H. Novel Chlorination of Imidazo‐Fused Heterocycles via Dichloro(aryl)‐λ3‐iodanes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peng-Fei Dai
- First Affiliated Hospital of Anhui Medical University Department of Nuclear Medicine 218 Jixi Road 230022 Hefei CHINA
| | - Huiqin Xu
- First Affiliated Hospital of Anhui Medical University Department of Nuclear Medicine 230022 NanJing CHINA
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4
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Tania, Molino A, Sharp-Bucknall L, Wilson DJD, Dutton JL. On the potential intermediacy of PhIBr 2 as a brominating agent. Org Biomol Chem 2022; 20:8454-8460. [DOI: 10.1039/d2ob01418a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PhIBr2 has been invoked as a brominating agent, however PhIBr2 does not appear to exist but rather forms PhI and Br2, with Br2 being responsible for bromination.
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Affiliation(s)
- Tania
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia
| | - Andrew Molino
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia
| | - Lachlan Sharp-Bucknall
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia
| | - David J. D. Wilson
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia
| | - Jason L. Dutton
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia
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5
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Farshadfar K, Ariafard A. Catalytic role of amines in activation of PhICl 2 from a computational point of view. Chem Commun (Camb) 2021; 57:9108-9111. [PMID: 34498641 DOI: 10.1039/d1cc03618a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We thoroughly investigated mechanistic features of dichlorination of diazoacetates using PhICl2 catalysed by pyridine. We found that the pyridine serves as a catalyst for decomposition of PhICl2 to PhI and Cl2, leading to the dichlorination step being driven by the in situ generated Cl2. This type of activation was found to be applicable to other amine-catalysed chlorination reactions using PhICl2.
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Affiliation(s)
- Kaveh Farshadfar
- Department of Chemistry, Islamic Azad University, Central Tehran Branch, Poonak, Tehran 1469669191, Iran
| | - Alireza Ariafard
- Department of Chemistry, Islamic Azad University, Central Tehran Branch, Poonak, Tehran 1469669191, Iran.,School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart TAS 7001, Australia.
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6
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Tania, Poynder TB, Kaur A, Barwise L, Houston SD, Nair AJ, Clegg JK, Wilson DJD, Dutton JL. PhICl 2 is activated by chloride ions. Dalton Trans 2021; 50:11986-11991. [PMID: 34378593 DOI: 10.1039/d1dt02565a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A study on the potential activating role of pyridine in the electrophilic chlorination of anisole by PhICl2 has led to the discovery that soluble sources of chloride ions activate PhICl2 in the reaction at catalytic loadings, greatly increasing the rate of chlorination. It is further shown that presence of chloride increases the rate of decomposition of PhICl2 into PhI and Cl2. The specific mechanism by which chloride induces electrophilic chlorination and decomposition of PhICl2 remains an open question.
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Affiliation(s)
- Tania
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Tiffany B Poynder
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Aishvaryadeep Kaur
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Lachlan Barwise
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Sevan D Houston
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Akshay J Nair
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - David J D Wilson
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Jason L Dutton
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
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