The infrared spectra of gaseous propionic, butyric and n-hexanoic anhydrides adsorbed on solid aluminum chloride catalyst are investigated to afford a spectroscopic contribution to knowledge of the acylation mechanism of these anhydrides with aluminum chloride. We have investigated to ≈ 2300 cm—1 the spectrum of these anhydrides to determine, in analogy with the behaviour of the acetic anhydride, if they give “oxocarbonium” ions by adsorbing on the catalyst. The presence of a strong and characteristic band in this range of the spectra of every anhydride assures us of the formation of “oxocarbonium” ions by adsorbing on the catalyst.
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Con il contributo del Ministero per i Beni e le Attività Culturali