Journal ArticleDOI
NMR study of orgnasilicon compounds
Jan Schraml,R. Ponec,V. Chvalovský,G. Engelhardt,H. Jancke,Heinrich Kriegsmann,M. F. Larin,V. A. Pestunovich,M. G. Voronkov +8 more
TLDR
In this paper, single and dual substituent parameter analysis was performed for a series of meta and para substituted phenoxytrimethylsilanes and the results showed that the increased silicon shift sensitivity to substituents in phenoxysilanes is due to higher sensitivity of silicon shielding (ϱ shield ) to electron density in these compounds rather than to a bettr transmission of electronic effects.About:
This article is published in Journal of Organometallic Chemistry.The article was published on 1979-09-25. It has received 20 citations till now. The article focuses on the topics: CNDO/2 & Substituent.read more
Citations
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Book ChapterDOI
29Si-NMR Spectroscopic Results
TL;DR: In this paper, it was shown very early that the isotope 29Si is very valuable for NMR research, severe technical difficulties had to be overcome before silicon spectra could be recorded.
Book ChapterDOI
Recent Advances in Silicon-29 NMR Spectroscopy
TL;DR: In this article, the recent advances made in silicon-29 nuclear magnetic resonance (NMR) spectroscopy were discussed, and the more recently obtained results in 29 Si NMR were presented.
Journal ArticleDOI
29Si N M R spectroscopy of trimethylsilyl tags
Jan Schraml,Jan Schraml +1 more
TL;DR: In this article, the authors present the results of one such traditional chemical approach to the perennial problem of NMR analysis of polyfunctional compounds and their mixtures, which they call the "tagging technique".
Journal ArticleDOI
Beiträge zur Chemie der Silicium-Schwefel-Verbindungen. XXIX. 29Si-NMR-Untersuchungen
W. Wojnowski,J. Pikies +1 more
TL;DR: In this article, the sterischen and induktiven Wirkungen der Silicium-Schwefel-Verbindungen (RO)3SiSR'(I), (i-PrO)4−nSi(SEt)n (II) and cyclic SiS-Verconnections (III) were discussed.
Journal ArticleDOI
29Si-13C spin-spin couplings over Si-O-Carom link.
Jan Sýkora,Vratislav Blechta,Vladimír Sychrovský,Jiří Hetflejš,Stanislav Šabata,Ludmila Soukupová,Jan Schraml +6 more
TL;DR: These properties render the 29Si–13C couplings suitable for line assignment in the spectra of silylated polyphenols suitable for couplings between other nuclei, in reasonable agreement with theoretical calculations.
References
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Journal ArticleDOI
Use of the CNDO Method in Spectroscopy. I. Benzene, Pyridine, and the Diazines
Janet E. Del Bene,H. H. Jaffé +1 more
TL;DR: In this article, the CNDO method was modified by substitution of semi-empirical Coulomb integrals similar to those used in the Pariser-Parr-Pople method, and by introducing a new empirical parameter κ to differentiate resonance integrals between σ orbitals from those between π orbitals.
Journal ArticleDOI
Calculation of Nuclear Magnetic Resonance Spectra of Aromatic Hydrocarbons
C. E. Johnson,Frank A. Bovey +1 more
TL;DR: In this article, the free electron model of Pauling was used to calculate the magnetic field around a benzene ring which is rotating rapidly about all axes in an external magnetic field.
Journal ArticleDOI
"Aromatic" substituent constants for structure-activity correlations
Journal ArticleDOI
Electronegativity. I. Orbital Electronegativity of Neutral Atoms
Jurgen. Hinze,H. H. Jaffe +1 more
Journal ArticleDOI
Field and resonance components of substituent effects
C. Gardner Swain,Elmer C. Lupton +1 more