Phenothiazine

Phenothiazine is a tricyclic heterocyclic compound with two benzene rings fused to a central ring containing sulfur and nitrogen. Its structure is the parent scaffold for numerous chemical derivatives.

Heterocyclic compound: A cyclic compound whose ring contains at least one atom other than carbon. Phenothiazine belongs to this broad structural family because its central ring contains sulfur and nitrogen.
Phenothiazine antipsychotic: A drug in the phenothiazine-derived class used chiefly to treat psychosis. Substitution on the parent scaffold produced drugs such as chlorpromazine.
August Bernthsen: A German chemist known for research on aromatic compounds and the chemistry of phenothiazine. His nineteenth-century investigations helped establish phenothiazine's preparation and structure.
Thioxanthene: A tricyclic sulfur-containing aromatic scaffold whose central ring lacks phenothiazine's nitrogen atom. Replacing phenothiazine's ring nitrogen with carbon gives a closely related scaffold.
Aromaticity: A molecular property associated with cyclic, conjugated systems that gain stability from delocalized electrons. The fused benzene rings contribute aromatic character to phenothiazine's scaffold.
Methylene blue: A phenothiazine-derived dye used as a stain, redox indicator, and medicine. Its colored, redox-active structure is a prominent application of phenothiazine chemistry.
Phenothiazine synthesis: Methods for constructing the phenothiazine tricyclic ring system from aromatic precursors. Synthetic routes made the parent scaffold accessible for derivatization.
Dibenzothiazepine: A tricyclic scaffold containing two benzene rings fused to a seven-membered sulfur- and nitrogen-containing ring. Its expanded central ring distinguishes it from phenothiazine's six-membered central ring.
Benzene: A six-carbon aromatic ring with molecular formula C₆H₆. Two benzene rings form the outer portions of phenothiazine's tricyclic framework.
Thioridazine: A phenothiazine antipsychotic formerly used to treat schizophrenia and other psychotic disorders. It demonstrates how side-chain changes yield distinct therapeutic derivatives.

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