Catalytic silylotropy inN-trimethylsilylpyrazole derivatives |
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| Authors: | V A Lopyrev L I Larina A I Albanov M S Sorokin G V Dolgushin |
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| Institution: | (1) Irkutsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, l ul. Favorskogo, 664033 Irkutsk, Russian Federation |
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| Abstract: | Silylotropy in 4-substitutedN-trimethylsilypyrazoles is studied by dynamic1H,13C, and29Si NMR spectroscopy. The catalytic 1,2-migration of a trimethylsilyl group in 4-halo-N-trimethylsilylpyrazoles was detected. Silylotropy inN-trimethylsilylpyrazoles in the presence of halogens of trimethylhalosilanes is believed to proceed through formation ofN,N -bis(trimethylsilyl)pyrazolium salts, the barrier of silylotropy in pyrazoles being markedly reduced.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 3011–3013, December, 1996. |
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| Keywords: | silylotropy dynamic1H 13C and29Si NMR N-trimethylsilylpyrazoles halogens trimethylhalosilanes |
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