Etude des composés d'addition des acides de LEWIS XXIX. Composés d'addition entre acides aromatiques et SbCl5, AlCl3, TiCl4, SnCl4 ou ZnCl2

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Abstract
The adducts of benzoic, p‐toluic, mesitoic and cinnamic acids with SbCl5, AlCl3, TiCl4, SnCl4 and ZnCl2 have been prepared, and the IR. absorption spectra of the compounds, in the solid state or in solution in CCl4, studied. The lowering of the carbonyl frequency shows that the acceptor is linked by a dative bond to the carbonyl oxygen atom acting as donor. A calculation, by the Wilson GF method, of force constants and their contributions in potential energy of vibration for monomeric benzoïc acid and its adduct with TiCl4 confirmed that the carbonyl stretching force constant, and therefore the CO bond order, is lowered by the formation of the adducts.

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