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- W1990993722 abstract "A new class of organosilicon compounds containing a pentacoordinate silicon atom, (aroyloxymethyl)trifluorosilanes (AFS), has been prepared. The presence of an intramolecular coordinate F3Si ← OC bond is supported by X-ray diffraction, IR spectroscopy and dipole moment data. Si ← O coordination in AFS has been shown to remain intact in the gaseous and liquid states below 420 K as well as in solution in most organic solvents. The dielectric constant of the medium significantly affects the nature of the coordinate Si ← O bond and that of the SiF, CO, COC bonds. In pyridine the intramolecular coordinate Si ← O interaction is disturbed or greatly weakened. At 420–500 K a reversible reaction takes place: ArCOOCH2SiF3 α ArCOOCH2SiF3 The changes in enthalpy and entropy are equal in this case: −△H 8.1 ± 0.7 kcal/mol; −°S 15.3 ± 0.8 e.u. T 450 K An assignment of bands in the IR spectra of AFS resulting from vibrations of atoms in the SiF3, >CO and COC groups is given. The electron impact-induced primary disintegration of the molecular ion 4-XC6H4COOCH2Si mainly involves abstraction of a fluorine atom." @default.
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- W1990993722 date "1980-11-01" @default.
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- W1990993722 title "(Aroyloxymethyl)trifluorosilanes: a new class of pentacoordinate silicon compounds" @default.
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- W1990993722 doi "https://doi.org/10.1016/s0022-328x(00)92574-9" @default.
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