Abstract

Carbon-13 NMR data for 25 phenylsilanes have been obtained and analyzed. Several substituents (viz. n-butyl, vinyl, allyl, t-butoxy) not previously considered were included in this study. The results, combined with earlier work, indicate no anomalous behavior of the silicon—phenyl bond as a function of the other substituents on the silicon atom. The importance of steric effects on the chemical shift due to groups three ( gauche) and four ( syn-axial) bonds removed from the phenyl group is demonstrated. Hammett σ + values for several silyl groups are estimated and correlations between 19F and 13C data for phenylsilanes are noted.

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