Polycyclic compound, nomenclature

Polyaza six-membered ring systems, 3, 1039-1086 Poly-e-caprolactone production, 7, 589 Polycyclic compounds nomenclature, 1, 14-28 Polyfuroxans, 6, 426 Polygermacyclopentanes, 1, 609... 

The nomenclature of oligosilsesquioxanes (as well as of their homo derivatives) has not been elaborated. These compounds are polyhedral oligocyclic systems of general formula (XiSiOi.5) with n = 2m (m 2), i.e., n = 4, 6, 8,10,12, etc. and X is the substituent at the silicon atom. In the simplest case, all the substituents Xj may be the same. On the basis of the existing lUPAC rules for naming polycyclic compounds, oligosilsesquioxanes may be termed in two ways ... 

Current IUPAC and Chemical Abstracts nomenclature has been employed in this index with the former given preference. Substitutive nomenclature has been given preference over radicofunc-tional, additive, subtractive, conjunctive or replacement nomenclature, except where this becomes unwieldy. With many bicyclic and polycyclic compounds bearing heteroatoms, standard bicyclic or polycyclic oxa, aza, and thia replacement nomenclature has often been used. With certain functional groups, where the names are rather complex and probably not familiar to most organic chemists, such as ylides, those compounds have simply been named as sulfur, tellurium and arsonic ylides. Metal catbenes have been treated similarly. With more complex functionality and many heterocycles, the Beilstein Commander Crossfire nomenclature system has been used with certain modifications. 

Instead attention is next directed to polycyclic compounds for which there is a different formal bond order than that which simplistic graph theory would imply. Unlike the subject matter introduced in Chapter 2, here traditional covalent bonds, in contradistinction to consideration of hydrogen bonds, are an integral part of the nomenclature. As a first example, note that, unlike the larger propellanes, the bond order is equal to zero between the bridgehead carbon atoms in [l,l,l]-propellane [40] (Figure 7). This "anomoly" is accounted for in the nomenclature by the name ... 

Monocyclic and polycyclic compounds with rings built exclusively of arsenic or antimony atoms are the scope of this chapter. The monocycles are known as cyclopolyarsanes (RAs) or cyclopolystibanes (RSb) with R = alkyl or aryl and n = 3-6. The lUPAC nomenclature suggests the following specific names for each ring size ... 

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