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Iannace V, Sabrià C, Xu Y, Delius MV, Imaz I, Maspoch D, Feixas F, Ribas X. Regioswitchable Bingel Bis-Functionalization of Fullerene C 70 via Supramolecular Masks. J Am Chem Soc 2024; 146:5186-5194. [PMID: 38311922 PMCID: PMC10910506 DOI: 10.1021/jacs.3c10808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 01/13/2024] [Accepted: 01/16/2024] [Indexed: 02/06/2024]
Abstract
Isomer-pure functionalized fullerenes are required to boost the development of fullerene chemistry in any field, but their multiple functionalization renders a mixture of regioisomers that are very difficult to purify by chromatography. For the specific case of C70, its nonspherical geometry makes its regioselective functionalization more challenging than that of spherical C60. In this work, the supramolecular mask approach is applied for the first time to C70, which is encapsulated in two different nanocapsules to achieve the Bingel bis-cyclopropanation at α-bonds of opposite poles. Based on the tetragonal prismatic geometry imposed by the smaller supramolecular mask tested, the obtained major bis-adduct is completely reversed (major 5 o'clock) compared to bare C70 functionalization (major 2 o'clock). Moreover, by further restricting the accessibility of C70 using a three-shell Matryoshka mask and dibenzyl-bromomalonate, a single regiospecific 2 o'clock bis-isomer is obtained, owing to the perfect complementarity of the mask and the addend steric properties. The outcome of the reactions is fully explained at the molecular level by means of a thorough molecular dynamics (MD) study of the accessibility of the α-bonds to produce the different bis-adducts.
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Affiliation(s)
- Valentina Iannace
- Institut
de Química Computacional i Catàlisi (IQCC) and Departament
de Química, Universitat de Girona,
Campus Montilivi, 17003 Girona, Catalonia, Spain
| | - Clara Sabrià
- Institut
de Química Computacional i Catàlisi (IQCC) and Departament
de Química, Universitat de Girona,
Campus Montilivi, 17003 Girona, Catalonia, Spain
| | - Youzhi Xu
- Institute
of Organic Chemistry, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Max von Delius
- Institute
of Organic Chemistry, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Inhar Imaz
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra, Catalonia, Spain
| | - Daniel Maspoch
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra, Catalonia, Spain
- ICREA, Passeig de Lluís Companys
23, 08010 Barcelona, Catalonia, Spain
| | - Ferran Feixas
- Institut
de Química Computacional i Catàlisi (IQCC) and Departament
de Química, Universitat de Girona,
Campus Montilivi, 17003 Girona, Catalonia, Spain
| | - Xavi Ribas
- Institut
de Química Computacional i Catàlisi (IQCC) and Departament
de Química, Universitat de Girona,
Campus Montilivi, 17003 Girona, Catalonia, Spain
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Li M, Zhao R, Dang J, Zhao X. Theoretical study on the stabilities, electronic structures, and reaction and formation mechanisms of fullerenes and endohedral metallofullerenes. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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