Abstract
A comparative study has been carried out of the relation of the1H chemical shifts of the SiH3 and CH3 groups in phenyl- and butylsilanes and in toluene on the value of the field at infinite dilution in 17 solvents with different volume permeabilities, in order to obtain reliable information on the properties of the Si-H bond in “isolated” molecules of monoorganosilanes. It is shown that the shielding constants for the hydrogens in the SiH3 group are more sensitive to field changes than are those of the CH3 group. There was no ring current effect on the chemical shift of the hydrogens of the SiH3 group in phenylsilane, and this is connected with π-d conjugation of the aromatic ring with the silicon atom.
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