Abstract
Publisher Summary This chapter explores fulvalene—compounds containing two cyclic polyenic systems with a central double bond. Depending on the ring size, cyclopropylidenecyclopropene, fulvalene, heptafulvalene, and the unsymmetrical hybrid molecules triapentafulvalene, triaheptafulvalene, and pentaheptafulvalene are members of this class of cyclic cross-conjugated systems. The general principle of heterocyclic chemistry to relate heterocyclic compounds to carbocyclic ones was the driving force for the synthesis and their application to heterofulvalenes. The chapter covers nitrogen-containing fulvalenes that can be obtained by replacement of CH=CH and/or CH. Compounds in which nitrogen atoms are arranged on the periphery of the cross-conjugated system as well as derivatives in which the central double bond contains heteroatoms are not included are presented in the chapter. It also discusses that concerning nomenclature, fulvalene and its related systems are the parent structures of this class of heterocyclic cross-conjugated compounds.
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