Fused polycyclic hydrocarbons, nomenclature

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 ... 

Advanced Chemistry Development Labs. Fused Polycyclic Hydrocarbons. http //www.acdlabs.com/iupac/nomenclature/79/r79 63.htm (accessed February 17, 2015). 

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. 

This chapter provides a historical perspective on the discovery of and classical approaches to carbon-rich molecules prior to 1970. Carbon-rich is defined here as a ratio of at least one C atom per H atom. Due to the tremendous amount of research in this field, this chapter focuses on the pioneering synthetic efforts and key successes thereafter and will not attempt to serve as an inclusive document on the subject. Several excellent references have been compiled which can provide further information [1], Additionally, the overwhelming plethora of substituted variants, while important in relation to derivatization and molecular diversity, will not be addressed unless unique in application or properties. Examples include the numerous alkyl-substituted or partially reduced derivatives of polycyclic aromatic hydrocarbons described in detail by Clar [la]. Finally, fused benzenoid structures are described with classical numerical nomenclature instead of the alphabetical lUPAC methodology used by Harvey [Icj. 

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