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It is known that the anion nature, in particular, BF4 has a significant influence on the reactivity of Pyrylium Salts. With the aim to demonstrate the presence of this anion firstly we used Mass Spectrometry but this technique proved to be useless. By using 19 F-NMR we have obtained remarkable results. In general, coupling constants 1 J(B-F) and 19 F chemical shift (δF) depend on the solvent, the concentration and the nature of the associated cation. Thus, we have analyzed the small but significant variations of chemical shifts from lightly and heavily modified tri-arylpyrylium cations.

In Search of Tetrafluoroborate Anion: <sup>19</sup>F-NMR Chemical Shifts Dependence of Substituents in Tri-Aryl Pyrylium Cations