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The ring currents as described by Pauling 1 and Lonsdale 2 , is a freedom of movement of electrons in Pz orbital of benzene and other aromatic hydrocarbons between adjacent carbon atoms. It is occurred in the presence of an external magnetic field to form interatomic π currents above and below the molecular plane. 1,2 It considered a prominent feature of aromatic compounds. Aromatic and antiaromatic systems can be distinguished according to their magnetic properties. 3 Since an aromatic species have the ability to support a diatropic ring current (anticlockwise, opposed ring current circulation), but antiaromatic compounds support a paratropic ring currents (clockwise, aligned ring current circulation). 4 Therelation between aromaticity and ring currents was proved by nuclear magnetic resonance spectroscopyNMR. 5

The Calculations of Ring Current of Some Benzenoids using Randić Model