Aromaticity of Organosulphur Compounds

The term aromaticity has been the subject of many discussions in recent years although no definition has been generally accepted. For the experimental chemist a compound may be aromatic if its chemistry is like that of benzene, while for the theoretical chemists a compound is aromatic if it has low ground-state enthalpy and other characteristic ground-state properties such as bond equalization, ring-current effect, Faraday effect etc. 

Labarre and Crasnier believe that the only way to avoid confusion will be a purely theoretical definition When the theory allows us to predict quantically the experimental signs of aromaticity, it will be possible to 

Galasso, Chem. Phys. Letters, 1973, 21, 54 V. Galaisso and N. Trinajstid, J. Chim. phys., 1973, 70, 1489. 

Gelius, B. Roos and P. Siegbahn, Theor. Chim. Acta, 1972, 27, 171. 

Some of these results are discussed in the following sections. 

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