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Proton magnetic resonance spectra of vinyltrimethylsilane and divinyldimethylsilane in dilute cyclohexane solution, at 40 Me/sec, have been analyzed and the parameters compared with those obtained for alkylethylenes under similar conditions. The results indicate the presence of d,.-p" structures in these siIanes.Additional anisotropy effects due to the presence of Si may also be involved but are believed not to be solely responsible for the effects observed. All the vinyl coupling constants are considerably greater than those observed in the alkenes, but are comparable to values obtained for molecules containing vinyl-metal bonds.

Theoretical analyses of proton magnetic resonance spectra of ABC systems have on occasion resulted in more than one set of acceptable parameters. It is proposed that such ambiguities can be eliminated by requiring the parameters to satisfactorily predict not only the normal spectral patterns but also those of the C13–H satellite spectra. This procedure has been successfully applied to tetravinylsilane and acrylonitrile.