Alkynyl mercury compounds of the type Hg(C=C-R)r (I), R'-Hg-C=C-R (II) and R'-Hg-GC-Hg-R' (III) have been studied by 'H, 13C and lPHg NMR. Chemical shifts (6'H, S"C, SIWHg) and coupling constants J(lWHg'H), J('99Hg'3C), J(13C'H) and J('3C5'3C) (in natural abundance) are reported. The changes in magn
Synthesis and 13C, 29Si, 199Hg nuclear magnetic resonance spectroscopy of alkynyl(trimethylsilyl)mercurials
โ Scribed by Angelika Sebald; Bernd Wrackmeyer
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 370 KB
- Volume
- 42
- Category
- Article
- ISSN
- 1386-1425
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โฆ Synopsis
Alkynyl(trimethylsilyl)
mercuriaB are formed by a fast and quantitative reaction between bis(alkynyl)-and bis(trimethylsilyl)me.rcury in chloroform or benzene at ambient temperature. They decompose slowly in solution to alkynyltrimethylsilanes and mercury. r3C, x%i, rg9Hg NMR data serve for the characterization. The polarixability of the Hg-Si bond and the great polarizing ability of the alkynyl group is clearly reflected by the NMR data.
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Silicon-29 spin-lattice relaxation times and 29Si-(1H} nuclear Overhauser enhancements are reported for five trialkylsilanes and for sym-tetramethyldisiloxane, all of which contain a direct Si-H bond. Relaxation rate contributions from (Si, H) dipolar interactions and from other mechanisms are evalu