Linking Molecular Rings

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Science  28 May 2004:
Vol. 304, Issue 5675, pp. 1207
DOI: 10.1126/science.304.5675.1207d

In organic synthesis, closing a ring in a molecule is often challenging enough, but chemists can now manage the closure of one ring through an existing ring on another molecule. Two reports now take ring linking to extremes by exploiting supramolecular interactions to guide the assembly process (see the Perspective by Siegel). Chichak et al. (p. 1308) have formed a molecular Borromean ring, in which three rings are linked such that cutting one link also separates the other two. Wang et al. (p. 1312) link two molecules, each with four rings, through the other set of rings.

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