Möbius Aromaticity

      There's also two conditions to be met for an aromatic system to be Mobius:

1. The "4n" rule.
   • Like the "4n+2" rule, this rule is an equation that is set equal to the number of π electrons within the system, and as with the "4n+2" rule, "n" must equal an integer when solved for.
2. There must be an odd number of phase changes within the orbitals. 
   
   

     Additonal Information:

          Under these conditions, if the "4n+2" rule is fulfilled rather than the "4n" rule, the system is considered antiaromatic.

          The edge of the compound is placed at the bottom of a Frost Circle.

          Most stable Möbius aromatic molecules need to contain at least 8 electrons, although 4-electron Möbius aromatic transition states are well known.

Figure 1:) Möbius System

     In the figure, the orbitals are twisting until an inversion occurs, causing a phase change to occur.