Synthesis of new bis(trimethylsilylcyclopentadienyl) complexes of hafnium
| Autor: | Jeffrey B. Hoke, Eric W. Stern |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Stereochemistry
Organic Chemistry chemistry.chemical_element Nuclear magnetic resonance spectroscopy Borohydride Biochemistry Medicinal chemistry Hafnium Inorganic Chemistry Hexane chemistry.chemical_compound chemistry Yield (chemistry) Alkoxide Materials Chemistry Methanol Physical and Theoretical Chemistry Metallocene |
| Zdroj: | Journal of Organometallic Chemistry. 412:77-84 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/0022-328x(91)86044-q |
| Popis: | The new trimethylsilylcyclopentadienyl hafnocene complexes, (Me3SiCp)2Hf(Cl)(BH4), (Me3SiCp)2Hf(H)(BH4), (Me3SiCp)2HfMe2, (Me3SiCp)2Hf(OR)2 (R = Me and Et), and (Me3SiCp)2Hf(Cl)(OMe), have been prepared in good yield from the reactions of (Me3SiCp)2HfCl2 with LiBH4, MeLi, Et3N/ROH (R = Me and Et), or NaOMe. All were isolated as volatile, low melting solids or oils. In the reaction of (Me3SiCp)2HfCl2 with LiBH4 in hexane, either the borohydride-chloride complex, (Me3SiCp)2Hf(Cl)(BH4) or the borohydride-hydride complex, (Me3SiCp)2Hf(H)(BH4), was isolated depending on the reaction temperature. Although the expected bis(borohydride) complex, (Me3SiCp)2Hf(BH4)2, was not obtained, 11B NMR spectroscopy suggests that it may be formed as an intermediate which subsequently loses BH3 to form (Me3SiCp)2Hf(H)(BH4). |
| Databáze: | OpenAIRE |
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