Abstract
Hyperconjugation between the CH 2Si bond and the charged pyridinium π system in the N-methyl 4-trimethylsilylmethyl pyridinium ion ( 8), manifests in the crystal structure as lengthening of the CH 2Si bond, shortening of the CH 2C ipso bond and smaller but systematic effects on the CC bond distances within the pyridinium ring. The structural effects are supported in solution by systematic effects on the 29Si– 13C and 13C– 13C one-bond coupling constants.
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