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Abstract

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

Analysis of polyfunctional compounds Trimethylsilylation NMR Two-dimensional NMR Line assignment Correlation spectra Satellite winnowing

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

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