Umemoto, Teruo published the artcileSyntheses and properties of N-fluoropyridinium salts, Safety of 1-Fluoropyridiniumtriflate, the publication is Bulletin of the Chemical Society of Japan (1991), 64(4), 1081-92, database is CAplus.
Various stable N-fluoropyridinium salts with a non- or weakly nucleophilic counter anion such as triflate, FSO3–, BF4–, SbF6–, ClO4–, CH3SO3– etc., or with an electron-donating or -withdrawing substituent(s) on the pyridine ring were synthesized and their properties investigated. N-Fluoropyridinium-2-sulfonates, N-fluoroquinolinium triflate, and highly hindered N-fluoro-2,6-di-tert-butylpyridinium salts were also synthesized. They were synthesized by counter anion displacement reactions of unstable pyridine-F2 compounds, fluorination of salts of pyridines with protonic acids or silyl esters with F, and/or fluorination of Lewis acid complexes of pyridines. The scope of each method was examined in detail. The stability of the N-fluoropyridinium salts depended on the nucleophilicity or basicity of the counter anions and electronic nature or position of the ring substituents. These results and NMR analyses clearly showed the unstable pyridine-F2 compounds to have N-fluoropyridinium fluoride salt structure. Some N-fluoropyridinium triflates were hydrolyzed and the products were examined, suggesting a unique hydrolysis mechanism. The authors warn of the toxicity of fluorine.
Bulletin of the Chemical Society of Japan published new progress about 107263-95-6. 107263-95-6 belongs to pyridine-derivatives, auxiliary class Fluorination reagent, name is 1-Fluoropyridiniumtriflate, and the molecular formula is C9H12O, Safety of 1-Fluoropyridiniumtriflate.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem