| 摘要 |
Disclosed is a method for. preparing N-fluoropyridinium salt of the general formula (I): <See formula I) which method comprises reacting a pyridine compound of the following general formula (II) with a Br~nsted acid of the general formula XH, but excluding hydrogen halide and fluorine, wherein a mole ratio of said formula (II) pyridine compound to said Br~nsted acid that is in the range of 1.01 to 1.2: <See formula II> and wherein, in each of said general formula (I) and (II), R1 to R5 are each selected from the group consisting of hydrogen, halogen, alkyl, aryl, acyl, aldoxycarbonyl, aryloxycarbonyl, carbamoyl, nitro, cyano, alkylsulfonyl, arylsulfonyl hydroxy, alkoxy, aryloxy, acyloxy, acylthyio, amido, alkansulfonyloxy and arenesulfonyloxy.
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