Abstract
For polycyclic heterocyclic compounds containing one or more heterocyclic nuclei of aromatic or nonaromatic character, together with one or more benzene or hydroaromatic rings, the systematic treatment of constitutive effects is rather involved. The types of systems are more numerous than in the case of monocyclic heterocyclic compounds : the electroactive group may be either in a heterocyclic or in a benzene ring ; similarly, the substituent also may be either in a heterocyclic or in a benzene ring and, moreover, it may be either in the same ring as the electroactive group or in another ring. Finally, the number of types of reaction series is increased by the possibility that in the system of condensed rings the electro-reduction or -oxidation of one of the rings may be considerably facilitated.
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