Cross conjugation at the heart of understanding the electronic theory of organic chemistry

Abstract

There has been almost no book and textbook of organic chemistry that stress the importance of the concept of cross-conjugation in unsaturated conjugated systems. The author has been analyzing this problem by using the graph-theoretical molecular orbital method, and clarified that this concept is playing an important role for verifying and understanding the essence of the electronic theory of organic chemistry. Further, he could also show the limit of this theory for actual application. The present author’s theory can be extended to another important problem of aromaticity and anti-aromaticity. Although this theory is based on the conventional HMO method, the essence of the present result will not be changed even by elaborating the level of the theory.