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Functional Group Identification by Two-Dimensional 29Si NMR Spectroscopy with Reversed Detection and Signal Winnowing

Volume 44, Number 3 (April 1990) Page 396-400

Pelnař, Jan; Blechta, Vratislav; Schraml, Jan

Trimethylsilylation followed by recording of 29Si NMR spectra is a useful method for functional group analysis, especially as the 29Si lines can be assigned to a particular group by exact experimental techniques. The low sensitivity of these techniques can be overcome by application of reversed methods employing 1H-detection. Adaptation of heteronuclear multiple quantum coherence 2D NMR spectroscopy to the measurements of 29Si-1H correlations is described, and preparatory experiments for winnowing signals of protons coupled to a 29Si nucleus are presented. The winnowing experiments designed to optimize 2D experiments have a wider application in identifying the signals of protons that are geminal to the functional group.