Toward Larger Cyclo‐9,10‐Anthryleneparaphenylenes

Nanohoops of different sizes can be generated from various aromatic building blocks. By a cross‐coupling strategy of an anthracene‐based kinked precursor and 9,10‐diborylated anthracene, nanohoops based on diphenylanthracene units were synthesized and isolated up to the nonamer with 36 para‐connected aromatic rings. Their three‐dimensional structures were investigated by X‐ray diffraction, and their reactivity against oxygen was studied. The trimeric macrocycle was rearomatized to the corresponding cyclo‐9,10‐anthryleneparaphenylene (CAPP) in solution, which turned out to be prone to oxidation.