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Gauthier ES, Rodríguez R, Crassous J. Metal‐Based Multihelicenic Architectures. Angew Chem Int Ed Engl 2020; 59:22840-22856. [DOI: 10.1002/anie.202004361] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Indexed: 11/10/2022]
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Gauthier ES, Rodríguez R, Crassous J. Metal‐Based Multihelicenic Architectures. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004361] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Beránek T, Žádný J, Strašák T, Karban J, Císařová I, Sýkora J, Storch J. Synthesis of a Helical Phosphine and a Catalytic Study of Its Palladium Complex. ACS OMEGA 2020; 5:882-892. [PMID: 31956841 PMCID: PMC6964522 DOI: 10.1021/acsomega.9b03830] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 12/18/2019] [Indexed: 05/28/2023]
Abstract
In this study, 9-(diphenylphosphanyl)[7]helicene was prepared as a suitable ligand for the subsequent synthesis of palladium complexes. The corresponding PdL2Cl2 complex was then successfully obtained in both racemic and enantiopure forms. The PdL2Cl2 complex emerges exclusively in the trans arrangement showing dynamic interconversion between its homo- and heterochiral forms as evidenced by 31P NMR. The trans arrangement was ultimately confirmed by X-ray crystallography using single crystals of the homochiral complex. Additionally, the PdL2Cl2 complex was subjected to screening of its catalytic activity in a Suzuki-type reaction of aryl bromides with aryl boronic acids showing fair yields of the resulting biaryls. However, the final asymmetric reactions catalyzed by the optically pure PdL2Cl2 complex provided targeted binaphtyls only in negligible enantiomeric excess.
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Affiliation(s)
- Tomáš Beránek
- Institute
of Chemical Process Fundamentals, v.v.i., The Czech Academy of Sciences, Rozvojová 1/135, 165 02 Prague 6, Czech Republic
- Department
of Organic Chemistry, University of Chemistry
and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Jaroslav Žádný
- Institute
of Chemical Process Fundamentals, v.v.i., The Czech Academy of Sciences, Rozvojová 1/135, 165 02 Prague 6, Czech Republic
| | - Tomáš Strašák
- Institute
of Chemical Process Fundamentals, v.v.i., The Czech Academy of Sciences, Rozvojová 1/135, 165 02 Prague 6, Czech Republic
| | - Jindřich Karban
- Institute
of Chemical Process Fundamentals, v.v.i., The Czech Academy of Sciences, Rozvojová 1/135, 165 02 Prague 6, Czech Republic
| | - Ivana Císařová
- Department
of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Jan Sýkora
- Institute
of Chemical Process Fundamentals, v.v.i., The Czech Academy of Sciences, Rozvojová 1/135, 165 02 Prague 6, Czech Republic
| | - Jan Storch
- Institute
of Chemical Process Fundamentals, v.v.i., The Czech Academy of Sciences, Rozvojová 1/135, 165 02 Prague 6, Czech Republic
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