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

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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.

Keywords: 29Si; Analysis of polyfunctional compounds; Correlation spectra; Line assignment; NMR; Satellite winnowing; Trimethylsilylation; Two-dimensional NMR

Document Type: Research Article


Affiliations: 1: Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, Prague 166 10 2: Institute of Chemical Processes Fundamentals, Czechoslovak Academy of Sciences, Prague 165 02, Czechoslovakia

Publication date: March 1, 1990

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