This text is an attempt to outline the basic facts concerning Kekul structures in benzenoid hydrocarbons: their history, applica- tions and especially enumeration. We further pOint out the numerous and often quite remarkable connections between this topic and various parts of combinatorics and discrete mathematics. Our book is primarily aimed toward organic and theoretical chemists interested in the enume- ration of Kekule structures of conjugated hydrocarbons as well as to scientists working in the field of mathematical and computational chemistry. The book may be of some relevance also to...

The mathematical treatment of coronoid hydrocarbons is a continuation of the authors' previous book "Kekule Structures" "in Benzenoid Hydrocarbons" (Lecture Notes in Chemistry, Vol. 46). The book addresses theoretical and mathematical chemists and graduate students. The treatment includes topological properties of coronoid systems, their enumeration and classification, the number of Kekule structures and of aromatic sextets.

In the last hundred years benzenoid hydrocarbons have constantly attracted the attention of both experimental and theoretical chemists. In spite of the fact that some of the basic concepts of the theory of benzenoid hydrocarbons have their origins in the 19th and early 20th century, research in this area is still in vigorous expansion. The present book provides an outline of the most important current theoretical approaches to benzenoids. Emphasis is laid on the recent developments of these theories, which can certainly be characterized as a significant advance. Em phasis is also laid on...