Silicon migration in N-(trimethylsilyl)-3,5-dimethylazoles
| Autor: | Nickolay M Sergeyev, G.S. Goldin, N.A. Viktorov, A.N. Koltsova, V. N. Torocheshnikov, V.G. Poddubny |
|---|---|
| Rok vydání: | 1974 |
| Předmět: |
Trimethylsilyl
Silicon Proton Stereochemistry Organic Chemistry Intermolecular force chemistry.chemical_element Carbon-13 NMR Ring (chemistry) Biochemistry Inorganic Chemistry Metal chemistry.chemical_compound Crystallography chemistry visual_art Materials Chemistry visual_art.visual_art_medium Imidazole Physical and Theoretical Chemistry |
| Zdroj: | Journal of Organometallic Chemistry. 70:347-352 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/s0022-328x(00)83367-7 |
| Popis: | The 1 H and 13 C NMR spectra of the following six compounds have been examined over a wide range of temperatures: four derivatives of 3,5-dimethylpyrazole substituted at the nitrogen atom by organometallic groups such as Si(CH 3 ) 3 (I), Si(C 2 H 5 ) 3 (II), Si(OC 2 H 5 ) 3 (III), Ge(CH 3 ) 3 (IV), 3,5-dimethyl-1-trimethylsilyl-1,2,4-triazole (V) and 1-trimethylsilylimidazole (VI). Activation energies of the metal migration have been found for the compounds (I–V) by the total NMR line-shape analysis. Proton and carbon spectra of the compound (VI) show equivalence of the positions 4 and 5 in the imidazole ring. No temperature-dependent changes in the spectra were observed at –80 to +80°. These facts may be interpreted by assuming that the organometallic group undergoes an intermolecular exchange. |
| Databáze: | OpenAIRE |
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