Circulene
Class of chemical
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Quadrannulene ([4]circulene)
The simple [4]circulene compound itself has not been synthesized, but a derivative, tetrabenzo[4]circulene, also called quadrannulene, has.
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[8]Circulenes
The isolation of the [8]circulene derivative 2,5,6,9,10,13,14-octamethyl-3,4,7,8,11,12,15,16-octa(4-tolyl)[8]circulene has been reported. Tetrabenzo[8]circulene (TB8C), a functionally stable form of the parent molecule [8]circulene has also been reported.
Heterocyclic circulenes
A heterocyclic circulene is one in which the fused rings around the periphery are not simple hydrocarbons, but instead contain at least one other element. Sulflower is a stable heterocyclic octacirculene based on thiophene.