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The syntheses and characterization of 10 dibenzo-substituted macrocycles incorporating mixed nitrogen, oxygen and/or sulfur donor sets are reported. The new systems, which incorporate six potential donor sites, extend the range of related (potentially tetradentate and pentadentate) macrocyclic systems reported previously.

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The syntheses of 16 new 16-to 19-membered dibenzo macrocycles are reported. These rings incorporate nitrogen together with oxygen andlor sulfur heteroatoms. The X-ray structure of the 17-membered macrocycle containing an 0 2 N 2 S heteroatom set is described.