Abstract
The studies performed during the last ten years on the possibility to determine an aromaticity criterion based on the energy of the occupied π orbitals has been described. The evolution of the research studies to obtain the D criterion defined as {[π1+ Σn2(π1-πn)]0/[π1+ Σn2(π1- πn)]} x a was described. The correlations between D and some other common aromaticity criteria have been presented showing a good relationship between D and other aromatic criteria; D values were used to determine some limits of other aromatic criteria. The role of both DFT functionals and basis sets have been discussed.
Keywords: Aromaticity, Π orbitals, DFT calculation, pentatomic heterocycles, hexaatomic aromatic compounds, condensed aromatic compounds, annulenes, substituted aromatic compounds.
Graphical Abstract
Call for Papers in Thematic Issues
Catalytic C-H bond activation as a tool for functionalization of heterocycles
The major topic is the functionalization of heterocycles through catalyzed C-H bond activation. The strategies based on C-H activation not only provide straightforward formation of C-C or C-X bonds but, more importantly, allow for the avoidance of pre-functionalization of one or two of the cross-coupling partners. The beneficial impact of ...read more
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