Clar's rule

Clar's Rule is a principle used in the field of organic chemistry, particularly in the study of polycyclic aromatic hydrocarbons (PAHs). It relates to the structure and stability of these compounds by focusing on the concept of resonance. Specifically, Clar's Rule states that the most stable resonance structures of PAHs can be determined by identifying the maximum number of completely benzenoid (aromatic) systems within the molecule.