Carbon-silicon hyperconjugation X-ray structural study of N-methyl-4-trimethylsilylmethylpyridinium triflate

摘要

Hyperconjugation between the CH-Si bond and the charged pyridinium pi system in the N-methyl 4-trimethylsilylmethyl pyridinium ion (8), manifests in the crystal structure as lengthening of the CH2-Si bond, shortening of the CH-Ci(ipso) bond and smaller but systematic effects on the C-C bond distances within the pyridinium ring. The structural effects are supported in solution by systematic effects on the Si-29-C-13 and C-13-C-13 one-bond coupling constants. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 34]