ChemInform Abstract: Novel Heterocyclic Systems. Part 40. First Synthesis of 3-Mercapto-2( 1H)-pyridinone (IV), a Simple Disubstituted Pyridine Useful for Synthesis of the 4-Azaphenoxathiine Ring System and Its Novel Diazaphenoxathiine Analogues: 1,6-Diazaphenoxathiine and 2,6- Diazaphenoxathiine.

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