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Communication | Special issue | Vol 18, No. 1, 1982, pp.101-105
Published online, 1st January, 1970
DOI: 10.3987/S(B)-1982-01-0101
Novel Heterocyclic Systems. Part 7. New Species Containing Two Pyridine Rings by Dehydration of 3-Hydroxy-2(1H)-pyridone Using Phosphorus Pentoxide.

Ian Matthews, Keith Smith,* and Jhon R. Turner

*Department of Chemistry, University College of Swansea, Singleton Park, Swansea SA2 8PP, U.K.


Dimeric dehydration products of 3-hydroxy-2(1H)-pyridone (1) are obtained by melting a mixture of (1) and P2O5 at 250-290°C. The major product is 3-hydroxy-1-(3-hydroxy-2-pyridyl)-2(1H)-pyridone (7). Also obtained are 1,6-diazaphenodioxin (5) and a novel betaine, 6-oxidodipyrido[2,1-b:2’,3’-d]oxazolium (6).