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Extended porphyrin
Extented porphyrins, or porphyrins with extended pi-system, form a class of porphyrins in which the pyrrole rings are fused with external aromatic fragments via the β-carbon atoms. The best known and most useful representatives of this class are the linearly annelated π-extended porphyrins, i.e. tetrabenzoporphyrins (TBP), tetranaphthoporphyrins (TNP), tetraanthraporphyrins (TAP), the optical and other properties of which are the subjects of materials research.
==Synthesis and structure==
Until recently, the only viable approach to tetrabenzoporphyrins and other extended porphyrins was based on the main synthetic strategy in phthalocyanine chemistry, in which the isoindole residues came from phthalimide or its close analogues being
condensed at high temperature in the presence of metal salts acting as templating agents.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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