Xanthene[n]arenes: Exceptionally Large, Bowl-Shaped Macrocyclic Building Blocks Suitable for Self-Assembly
journal contributionposted on 2021-10-19, 18:26 authored by Jonathan Pfeuffer-Rooschüz, Lucius Schmid, Alessandro Prescimone, Konrad Tiefenbacher
A new class of macrocycles denoted as “xanthene[n]arenes” was synthesized. In contrast to most other macrocycles, they feature a conformationally restricted bowl shape due to the attached alkyl groups at the linking methylene units. This facilitates the synthesis of cavitands and the self-assembly to molecular capsules via noncovalent interactions. The derivatization potential of the novel macrocycles was demonstrated on the xanthenearene scaffold. Besides a deep cavitand and an oxygen-embedded zigzag hydrocarbon beltarene, a modified macrocycle was synthesized that self-assembles into a hydrogen-bonded tetrameric capsule, demonstrating the potential of xanthene[n]arenes as a new set of macrocyclic building blocks.