ABSTRACT
An aromatic compound present enhanced thermodynamic stability, which is relative to acyclic structural analogs, and tends to retain the structural type during the chemical transformations. The quantum mechanical origins of aromaticity were modeled for the first time in 1931 by E. Huckel who separate the bonding electrons in sigma and pi electrons. Aromaticity can be described using a collection of physicochemical properties which determine specific features of cyclic and polycyclic molecules containing π-electrons. The aromaticity concept can also be extended on chars. Known for their ability to improve fertility and to immobilize hazardous compounds, chars can also be used in producing green energy, offering an ecological perspective to the concept of organic waste management. As a consequence, for organic aromatic substitution reactions were developed inorganic analogs, leading to designing of new materials.
