Chloroform → N-Ethyl-N-phenyl-5-chloro-1,2-dihydro-4-hydroxy-1-methyl-2-oxo-3-quinolinecarboxamide iron (III) salt

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N-Ethyl-N-phenyl-5-chloro-1,2-dihydro-4-hydroxy-1-methyl-2-oxo-3-quinolinecarboxamide sodium salt (5.0 g, 13.2 mmol) was dissolved in water (80 ml) at 40° C. and chloroform (100 ml) was added. A solution of iron(III)sulphate pentahydrate (0.95 eq., 2.09 mmol, 1.023 g) dissolved in water (30 ml) was added. The two-phase system was stirred vigorously and pH in the aqueous phase was adjusted to 8 with 1 M NaOH. The deep-red organic phase was separated, dried with sodium sulphate, and solvents were removed to give the title compound as a red amorphous glassy mass (4.22 g, 85% yield). MS-ESI: m/z 1122 [MH]+. The glassy mass was dissolved in methanol and red crystals of the title compound were formed. The crystals were filtered, washed with methanol, and dried under vacuum to give the title compound (3.96 g, 80% yield). Anal. Calcd for C57H48N6O9Cl3Fe: C, 61.0; H, 4.31; N, 7.48, Found C, 62.7; H, 4.37; N, 7.27, EDTA-titriometric determination of iron (III) gave a content of 4.90% (theoretical content is 4.97%).

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