Polycyclic aromatic compounds ( PAC ) are a huge class of organic molecules that can be found
everywhere. They called attention of scientists by their interesting and sometimes peculiar physical and chemical
properties. That is why, there are a number of research articles and books in which their synthesis, properties,
reactions, and theoretical investigations have been communicated. In this survey will be outlined several simple
methods for assessing the partition of π-electrons in rings of some classes of PAC.
Keywords: Aza-derivatives of benzenoid hydrocarbons, benzenoid hydrocarbons, electron content of a ring, electron
excess, phenylenes, polycyclic aromatic compounds.
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