Collect. Czech. Chem. Commun. 1985, 50, 2060-2064

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

Jaan Pasta, Jüri Puskara, Jan Schramlb and Endel Lippmaaa

a Institute of Chemical Physics and Biophysics, Estonian Academy of Sciences, Tallinn 200 001, U.S.S.R.
b Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol, Czechoslovakia


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.