Frost Circle for Pi Orbital Energies

The Frost circle is a graphical method for showing the relative energies of pi molecular orbitals in planar, fully conjugated, monocyclic compounds. It is also called the inscribed polygon method. A. A. Frost and Boris Musulin first described this method in 1953.

To build a Frost circle, draw a p...

The Frost circle or the inscribed polygon method is a graphical method based on Hückel's rule to determine the number and relative energies of the π molecular orbitals of planar, monocyclic, and conjugated systems.

A Frost circle is drawn by inscribing a polygon, representing the cyclic compound, inside a circle with one of the vertices p...