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      Stereoselective synthesis of a composite knot with nine crossings

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          Efficient and Recyclable Monomeric and Dendritic Ru-Based Metathesis Catalysts

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            Chemical topology: complex molecular knots, links, and entanglements.

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              Molecular borromean rings.

              The realization of the Borromean link in a wholly synthetic molecular form is reported. The self-assembly of this link, which is topologically achiral, from 18 components by the template-directed formation of 12 imine and 30 dative bonds, associated with the coordination of three interlocked macrocycles, each tetranucleating and decadentate overall, to a total of six zinc(II) ions, is near quantitative. Three macrocycles present diagonally in pairs, six exo-bidentate bipyridyl and six endo-diiminopyridyl ligands to the six zinc(II) ions. The use, in concert, of coordination, supramolecular, and dynamic covalent chemistry allowed the highly efficient construction, by multiple cooperative self-assembly processes, of a nanoscale dodecacation with an approximate diameter of 2.5 nanometers and an inner chamber of volume 250 A(3), lined with 12 oxygen atoms.
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                Author and article information

                Journal
                Nature Chemistry
                Nature Chem
                Springer Nature America, Inc
                1755-4330
                1755-4349
                September 10 2018
                Article
                10.1038/s41557-018-0124-6
                30202101
                daf2f0a3-4972-4dca-8254-734d68f5a502
                © 2018

                http://www.springer.com/tdm

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