Etude de composés d'addition d'acides de Lewis, XXXIV [1] Composés d'addition de benzoquinone‐1, 4 avec TiCl4

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Abstract
The adduct 1,4‐benzoquine · TiCl4 has been prepared in CH2Cl2 solution at about −60°. Its IR. spectrum has been recorded at the same temperature. The experimental study of the vibrational frequencies has been completed by the calculation of the fundamental vibrations in the molecular plane, using Wilson's FG method, with slightly simplified models of 1,4‐benzoquinone · TiCl4 (13 masses) and 1,4‐benzoquinone · 2 TiCl4 (14 masses); analysis by use of internal and symmetry coordinates. An assignment of most of the observed bands is proposed and the conclusion is reached that the complex, when solid, is (1,4‐benzoquinone · TiCl4)n.The force constants F(CO) are 9,85 · 105 dyne/cm for the quinone and 8,8 · 105 dyne/cm for the disturbed carbonyl bond of the polymerized complex in the model proposed.At ordinary temperature in benzene solution of the components the adduct 1,4‐benzoquinone. TiCl4 · benzene precipitated; with the help of the models, the fundamental vibrations of its IR. spectrum have been assigned.

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