The reaction of 2,3-epoxy-3-(2-nitrophenyl)propiophenone(2-nitrochalcone epoxide) with ethereal hydrogen chloride gives 6-chloro-1,3-dihydroxy-2-phenylquinolin-4(1H)-one; the corresponding unchlorinated product is obtained in the presence of quinol.
I. P. Sword, J. Chem. Soc. C, 1971, 820 DOI: 10.1039/J39710000820
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