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Synthesis and structure of new macrocyclic bisindolylmaleimides

Mandl, C. ; Zabel, M. ; König, B.


We report synthesis and structure of three new macrocyclic bisindolylmaleimides. The UV spectra of the xylene-bridged compounds 4 and 6 show significant differences. A dependence of the absorption properties on the maleimide-indole torsion angles is likely. A first attempt to use induced changes in ring conformation of the more flexible macrocyclic crown ether derivative 8 to signal the presence of metal cations failed.

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