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Cyclic conjugation in the "empty" central ring of tetrabenzo-  [bc,ef,op,rs]circumanthracene (TBCA) is stronger than in its neighboring  "nonempty" rings, contradicting the predictions of Kekulè-structure-based  theoretical models. Earlier examples of such anomalous cyclic conjugation  were observed in highly strained, non-planar benzenoid systems. Because the  molecule of TBCA is perfectly planar and strain-free, its cyclic conjugation  pattern could be tested and verified by means of high-level, B3LYP/6-  311+G(d,p), ab initio DFT calculations

Verifying the modes of cyclic conjugation in tetrabenzo[bc,ef,op,rs]circumanthracene