Nomenclature fused polycyclic compounds

Polycyclic parent hydrides. These are classified as bridged polyalkanes (also known as von Baeyer bridged systems, from the nomenclature system developed to name them), spiro compounds, fused polycyclic systems and assemblies of identical rings. The four systems may be either carbocyclic or heterocyclic. In developing their names, the following principles are used. 

Unlike the lack of logic in the IUPAC system that results when additional "fused polycyclic hydrocarbons" are named by addending rings to one of these "privileged" 35 reference compounds at specified locations, it is highly desirable that the nomenclature for all ring systems uses the same criteria. This is another virtue of proposed system. Meanwhile a close scrutiny of the molecules depicted in Tables 1 and 2 reveal ... 

Extended series of trivial names that are to be retained (or just too frequently used to be simply omitted) have already been compiled in various tables of Chapter 1 of this book (fused polycycles Table l,p. 16, heterocycles Tables 2 and 3, p. 44,50). For the numerous trivial names to be dealt with in the domain of the functional compound classes of Chapter 2 it has been found more appropriate not to include them directly in the text but to confine them to a tabular appendix. Specific hydrocarbon systems such as terpenes and steroids, whose nomenclature is widely dominated by trivial names, are also accounted for in this appendix. 

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