Chapter Nine – Calculating the Aromaticity of Heterocycles

Halina Szatyłowicz , Olga Stasyuk , Tadeusz Marek Krygowski

Abstract

Heterocycles play a very important role in chemistry, biochemistry, pharmacy, and related fields; therefore, the ability to describe their π-electron delocalization is essential. The description and the application of the most effective and popular aromaticity indices based on energetic, structural, magnetic as well as electronic properties are presented herein for heterocycles. A multidimensional character of aromaticity has again been confirmed for five- and six-membered heterocyclic rings and for their fused systems indicating that utilization of one index only cannot be sufficient for the estimation of the aromatic character of a given system. In turn, the usefulness of the Kohonen neuron networks for the classification of the π-electron cyclic systems into three sets, namely aromatic, nonaromatic, and antiaromatic, has been shown. Although for all these groups some linear correlations between various aromaticity descriptors may exist, for each separated subgroup these relationships fail.
Author Halina Szatyłowicz ZChF
Halina Szatyłowicz,,
- Department Of Physical Chemistry
, Olga Stasyuk ZChF
Olga Stasyuk,,
- Department Of Physical Chemistry
, Tadeusz Marek Krygowski
Tadeusz Marek Krygowski,,
-
Pages301-327
Publication size in sheets1.3
Book Scriven Eric F.V, Ramsden Christopher A. (eds.): Advances in Heterocyclic Chemistry, vol. 120, 2016, Elsevier, ISBN 9780128052488, 364 p.
Keywords in English Aromatic character; Aromaticity indices; Azine; Azole; Heterocycles; Nucleobases; Pyridine; Pyrrole; Tautomers; Thiophene
DOIDOI:10.1016/bs.aihch.2016.03.007
URL http://www.sciencedirect.com/science/article/pii/S0065272516300228
Languageen angielski
Score (nominal)25
Citation count*0
Cite
Share Share

Get link to the record
msginfo.png


* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Back