| Volume 15 describes the methods of synthesis of six-membered hetarenes with one nitrogen or phosphorus atom. It follows the volume dealing with six-membered hetarenes with one chalcogen, and precedes the volume with sections on six-membered hetarenes with two or more heteroatoms. As the present volume deals with major hetarenes such as pyridines, quinolines and isoquinolines, including the related pyridinones, quinolinones and isoquinolinones, it is very substantial in size. These rather mature hetarenes together make up approximately 75% of the volume content. The remaining nitrogen heterocyclic systems, the quinolizinium salts, naphthyridines, acridines (and acridinones), and phenanthridines (and phenanthridinones), are relatively short but no less interesting in their particular ways. The sections on the related phosphorus systems are also relatively brief, reflecting the rather recent but nevertheless growing development of this area.
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