+++Thanks_Ol.Lo_1 article from chem het compds

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Chemistry of Heterocyclic Compounds, July 1978, Volume 14, Issue 7, pp 725-727
Structures of bromo-substituted pyrone-4-carboxylic acids obtained by direct bromination

G. A. Khutornenko, S. G. Rozenberg, A. E. Vasil'ev

DOI:

http://dx.doi.org/10.1007/BF00471636

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http://link.springer.com/article/10.1007/BF00471636

[Ol.Lo]