THE INTERACTIONS OF (=O-]SI)-(BENZOYLOXYMETHYL)TRIFLUOROSILANE AND (=O-]SI)-(BENZOYLOXYMETHYL)METHYLDIFLUOROSILANE WITH A SOLVENT

The IR spectra of solutions of (=O-->Si)-(benzoyloxymethyl)trifluorosi lane (1), -(benzoyloxymethyl)methyldifluorosilane (2), and butyl benzo ate (3) are examined in the region of the v(C=O) stretching vibrations in 24 solvents. The ability of compounds 1-3 to undergo specific inte rmolecular interactions is evaluated from the dependence of v(C=O) on the Kamlet-Taft (pi, alpha, beta) parameters, which was obtained for the carbonyl groups involved in the intramolecular coordinate (=O-->Si ) bond and for free carbonyl groups. The corresponding values of the c oefficients in the Kamlet-Taft equations are indicative of a weak abil ity of pentacoordinate silicon compounds 1 and 2 to undergo acid-base interactions.