Homo aromatic, quasi aromatic, fulvalen system, NICS , benzanoid system January 15, 2023

Sure, I can provide you with a description of HOMO and Quasi-Aromatic.
HOMO stands for Highest Occupied Molecular Orbital. It is a term used in quantum chemistry to describe the highest energy electron-containing molecular orbital. HOMO is important in the study of chemical reactions because it determines the reactivity of a molecule. A high energy HOMO means that the molecule is more likely to participate in chemical reactions and will be more reactive.
Quasi-Aromatic refers to a type of ring system that resembles an aromatic ring but does not strictly adhere to all the criteria for aromaticity. Aromatic rings, such as benzene, are characterized by a planar structure, alternating double bonds, and the presence of delocalized electrons that contribute to the stability of the ring. Quasi-aromatic systems, on the other hand, are similar in structure but do not have all the properties of an aromatic ring. They can still exhibit aromatic character and contribute to the stability of a molecule, but they are not considered true aromatics.
I hope this helps you understand the concepts of HOMO and Quasi-Aromatic.