“…The efficiency of the different solid fluoride sources strongly depends on the counter ion, especially if polymer‐supported, that has an influence on the availability and nucleophilicity of the fluoride ion towards silicon atom. This is not surprising, also on the basis of our previous experience on the influence of the solid polymeric support on the efficiency of an immobilized catalyst 12,15,17,19,20,22. A striking example is given by the different efficiency showed by Amberlite ® IRA 400F (a gel‐type polystyrene resin) and Amberlite ® IRA 900F (a macroreticular polystyrene resin) (Table 1, entry 2 vs. 6).…”