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Synthesis and reactions of 6-chloro-7-fluoro-4-oxo-4 H -chromene-3-carboxylic acid are described. The molecular structure of its achiral heterotopic 3-diethoxy-methyl precursor has been determined by NMR spectroscopy and X-ray crystallography. C 14 H 14 ClFO 4  is monoclinic, space group  P 2 1 / a , with unit cell dimensions  a  = 14.923(5),  b  = 6.615(2),  c  = 14.921(5) Å,  β  = 101.44(3)°,  V  = 1443.7(8) Å 3 ,  Z  = 4,  D  calc.  = 1.383 g/cm 3 .

zeitschrift für kristallographie - crystalline materials

Synthesis and properties of 6-fluoro-7-chloro-4-oxo-4 H -chromene 3-carboxylic acid. X-ray structure of achiral heterotopic 3-diethoxymethyl-6-fluoro-7-chloro-4-oxo-4 H -chromene