STUDIES ON THE REACTIVITY AND STRUCTURE OF PHENYL 7-FLUORO-4-CHROMONE-3-SULFONATE

The new, fluorinated benzoxathiinopyrazole 4 and the hitherto unknown fluorinated benzoxathiino-dihydropyridine 5 can be produced by reactin g the title compound 1 with cyanoacetic hydrazide (3) in the presence of sodium acetate. The structures of the compounds 4 and 5 were confir med with the help of spectroscopic techniques, and their respective pa ths of formation have been discussed. The structure of the ester 1 was extensively studied by single crystal X-ray analysis, then compared w ith that of the unfluorinated phenylsulfonate 2.