13C and 29Si NMR spectra and intramolecular interactions in derivatives of phosphaalkenes R-P=C[Si(CH3)3]2

1988 ◽  
Vol 24 (6) ◽  
pp. 699-702
Author(s):  
Yu. P. Egorov ◽  
M. I. Povolotskii ◽  
V. D. Romanenko
Keyword(s):  
Nmr Spectra ◽  
Intramolecular Interactions ◽  
29Si Nmr ◽  
29Si Nmr Spectra ◽  
Derivatives Of

Routine use of inept technique for measurements of 29Si NMR spectra of trimethylsilyl derivatives

1983 ◽  
Vol 48 (12) ◽  
pp. 3402-3406 ◽  
Author(s):  
Jan Schraml
Keyword(s):  
Nmr Spectra ◽  
Chemical Shifts ◽  
29Si Nmr ◽  
Practical Applications ◽  
Unknown Structure ◽  
29Si Nmr Spectra ◽  
Standard Set ◽  
Trimethylsilyl Derivatives ◽  
Low Sensitivity ◽  
Derivatives Of

Low sensitivity of 29Si NMR, slow 29Si relaxation, and negative Overhauser effect severly limit practical applications of 29Si NMR. The need for the large amount of the sample or of spectrometer time is dramatically reduced if the spectra can be recorded by INEPT technique. It is shown that a standard set of acquisition parameters allows routine measurements of proton decoupled 29Si NMR spectra by INEPT technique in trimethylsilyl derivatives of organic compounds with unknown structure. The INEPT technique makes measurements of 29Si chemical shifts from as litle as 20μmol of compound practical.

29Si NMR spectra of trimethylsilyl andtert-butyldimethylsilyl derivatives of purines and pyrimidines

1998 ◽  
Vol 36 (1) ◽  
pp. 55-63 ◽  
Author(s):  
Jan Schraml ◽  
Magdalena Kvíčalová ◽  
Vratislav Blechta ◽  
Roman Řeřicha ◽  
Jef Rozenski ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
29Si Nmr ◽  
29Si Nmr Spectra ◽  
Derivatives Of ◽  
Purines And Pyrimidines

17O, 13C, and 29Si NMR spectra of some acyloxy- and diacetoxysilanes and acetoxygermanes

1986 ◽  
Vol 51 (11) ◽  
pp. 2582-2589 ◽  
Author(s):  
Antonín Lyčka ◽  
Jaroslav Holeček ◽  
Karel Handlíř ◽  
Josef Pola ◽  
Václav Chvalovský
Keyword(s):  
Periodic System ◽  
Time Scale ◽  
Nmr Spectra ◽  
Group Element ◽  
29Si Nmr ◽  
Carboxyl Group ◽  
29Si Nmr Spectra ◽  
Oxygen Atoms

The 17O, 13C, and 29Si NMR spectra of (CH3)3SiOC(O)R, CH3(XCH2)Si(OC(O)CH3)2, and R3GeOC(O)CH3 compounds are reported. In the 17O NMR spectra at 350 K the only signal is observed with the two latter series, but two well-resolved signals are displayed with the (CH3)3SiOC(O)R compounds. The equivalence of both oxygen atoms in carboxyl group on the NMR time scale is discussed from the viewpoint of a possible coordination of the oxygen atoms to the IVB group element of the periodic system.

Beiträge zur Chemie des Siliciums und Germaniums, XXXIX [1]. Darstellung, Eigenschaften und 29Si-NMR-Spektren von höheren Kaliumsilanylen KSinH2n+1 / Contributions to the Chemistry of Silicon and Germanium, XXXIX [1]. Preparation, Properties and 29Si-NMR Spectra of Higher Potassium Silanyls

1985 ◽  
Vol 40 (10) ◽  
pp. 1301-1305 ◽  
Author(s):  
Franz Fehér ◽  
Michael Krancher
Keyword(s):  
High Field ◽  
Nmr Spectra ◽  
The Other ◽  
29Si Nmr ◽  
Reaction Conditions ◽  
Low Field ◽  
Field Shift ◽  
29Si Nmr Spectra ◽  
Silicon And Germanium

Diluted solutions of potassium disilanyl, 2-potassium trisilanyl and 2-potassium isotetrasilanyl in m onoglym e have been prepared from potassium silyl and di- or trisilane under suitable reaction conditions. The purity of the silanyls varies between 95 and 99%. Their stability increases from potassium di- to 2-potassium isotetrasilanyl. The 29Si NMR spectra exhibit a strong high field shift for the metal substituted silicon atoms and a m oderate low field shift for the other silicon atoms compared with the signals of the corresponding silanes.

Assignment techniques for 29Si NMR spectra of pertrimethylsilylated products. 29Si satellites in 13C NMR spectra measured with selective 29Si decoupling

1985 ◽  
Vol 50 (9) ◽  
pp. 2060-2064 ◽  
Author(s):  
Jaan Past ◽  
Jüri Puskar ◽  
Jan Schraml ◽  
Endel Lippmaa
Keyword(s):  
Nmr Spectra ◽  
29Si Nmr ◽  
13C Nmr Spectra ◽  
Difference Spectroscopy ◽  
Experimental Scheme ◽  
H Nmr ◽  
Correct Assignment ◽  
Sensitivity And Selectivity ◽  
29Si Nmr Spectra ◽  
C Nmr

It is shown that measurement of 29Si satellites in proton decoupled 13C NMR spectra with selective 29Si decoupling allows correct assignment of lines in 29Si NMR spectra of pertrimethylsilylated products. The experimental scheme, where selective decoupling and FID phase alternation are used (difference spectroscopy), has sufficient sensitivity and selectivity, provided the 29Si lines are well separated. The main advantage of the method is that it can be applied to compounds with unresolved 1H NMR spectra or with no protons in γ position to the silicon atom.

Kinetics of interaction of 3-aminopropyltriethoxysilane with silica gel using elemental analysis and 29Si NMR spectra

1997 ◽  
Vol 275 (7) ◽  
pp. 672-680 ◽  
Author(s):  
A. Yoshino ◽  
H. Okabayashi ◽  
I. Shimizu ◽  
C. J. O’Connor
Keyword(s):  
Silica Gel ◽  
Elemental Analysis ◽  
Nmr Spectra ◽  
29Si Nmr ◽  
29Si Nmr Spectra ◽  
Kinetics Of

The fine structure of high-resolution solid state 29Si NMR spectra of zeolites X and Y

1986 ◽  
Vol 127 (6) ◽  
pp. 563-565 ◽  
Author(s):  
Xinsheng Liu ◽  
Jacek Klinowski ◽  
J.M. Thomas
Keyword(s):  
Fine Structure ◽  
Solid State ◽  
High Resolution ◽  
Nmr Spectra ◽  
29Si Nmr ◽  
29Si Nmr Spectra
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