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Analysis of Complex Networks by Frank Emmert-Streib, Matthias Dehmer

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9.11 Aromatic Properties

Aromatic rings are made of a conjugated system of unsaturated bonds with delocalized pi electron clouds [115, 116]. Such systems are planar and exhibit stronger stabilization than would be expected by conjugation alone. To assign aromatic properties to rings we select the smallest rings first and then use the breadth-first search (BFS) algorithm to identify conjugated bonds. This is not enough to assign aromaticity to individual rings; the whole rings system has to be taken into account.

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