Isotope-induced chemical shifts 2Δ10/11B(29Si) in alkenylsilanes containing three- and four-coordinate boron. A new tool for studying weak intramolecular boron–element bonds
✍ Scribed by Bernd Wrackmeyer; Oleg L. Tok
- Book ID
- 102523955
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 150 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1036
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✦ Synopsis
Abstract
Numerous alkenylsilanes with silyl and boryl groups in cis ‐positions at the CC bond were studied for the first time by ^29^Si NMR with regard to isotope‐induced chemical shifts Δ^10/11^B(^29^Si). Such effects are transmitted across an Si—X—B bridge (X = H, OR, SR, Cl) most efficiently if the interactions in this bridge are weak. In the absence of an Si—X—B bridge, ^3^Δ^10/11^B(^29^Si) effects were not observed. In such cases, where, depending on the substituents, both weak and strong B—X bonding are possible, the ^2^Δ^10/11^B(^29^Si) effects were readily observed only for weak B—X interactions (except for X = Cl), whereas for strong B—X bonding the effects were small or not detectable. Thus, the ^2^Δ^10/11^B(^29^Si) values provide another tool for probing weak interactions which are not clearly reflected by other NMR data. Copyright © 2002 John Wiley & Sons, Ltd.