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0003240786
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Molecular necklaces constitute a subset of catenanes. For a given number of rings, a molecular necklace is uniquely defined. A molecular necklace consisting of a total of n rings (n - 1 small rings threaded onto one larger ring) is denoted as [n]MN, which is a topological stereoisomer of [n]catenane. For example, the molecular necklace [5]MN described here and olympiadane synthesized by Stoddart and coworkers (D. B. Amabilino, P. R. Ashton, A. S. Reder, N. Spencer, J. F. Stoddart, Angew. Chem. 1994, 106, 450;
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13
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33748215607
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Angew. Chem. Int. Ed. Engl. 1994, 33, 433) are topological stereoisomers. The minimal molecular necklace is [4]MN; the smaller molecular necklaces [2]MN and [3]MN are equivalent to [2]catenane and [3]catenane, respectively.
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Angew. Chem. Int. Ed. Engl.
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0001413546
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a) F. Bitsch, G. Hegy, C. Dietrich-Buchecker, E. Leize, J.-P. Sauvage, A. V. Dorsselaer, J. Am. Chem. Soc. 1991, 113, 4023;
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b) F. Bitsch, C. O. Dietrich-Buchecker, A.-K. Khemiss, J.-P. Sauvage, A. V. Dorsselaer, New J. Chem. 1994, 18, 801.
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Dorsselaer, A.V.5
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0032513696
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Very recently, Stoddart and co-workers also isolated and characterized a [4]MN in the synthesis of oligocatenanes: D. B. Amabilino, P. R. Ashton, V. Balzani, S. E. Boyd, A. Credi, J. Y. Lee, S. Menzer, J. F. Stoddart, M. Venturi, D. J. Williams, J. Am. Chem. Soc. 1998, 120, 4295.
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Amabilino, D.B.1
Ashton, P.R.2
Balzani, V.3
Boyd, S.E.4
Credi, A.5
Lee, J.Y.6
Menzer, S.7
Stoddart, J.F.8
Venturi, M.9
Williams, D.J.10
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23
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33747526534
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note
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3). Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB21EZ, UK (fax: (+44)1223-336-033; e-mail: deposit@ccdc.cam.ac.uk).
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24
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33747547498
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The numbers correspond to the distances from the central ring of the phenanthroline to the copper corners
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The numbers correspond to the distances from the central ring of the phenanthroline to the copper corners.
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25
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85088713334
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note
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1H NMR spectroscopy, yields a mixture from which we have been so far unable to isolate pure compounds (en = ethylenediamine).
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