Synthese, Struktur und Reaktivität zweikerniger Pentamethyl-Cyclopentadien-Nickelkomplexe mit verbrückenden Butadienliganden
| Autor: | Richard Goddard, Uwe Denninger, Christian W. Lehmann, Carl Krüger, Jörg J. Schneider |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
chemistry.chemical_classification
Magnesium Stereochemistry Dimer Organic Chemistry chemistry.chemical_element Alkyne Crystal structure Biochemistry Inorganic Chemistry Crystallography chemistry.chemical_compound Nickel chemistry One pot reaction Materials Chemistry Molecule Physical and Theoretical Chemistry Phosphine |
| Zdroj: | Journal of Organometallic Chemistry. 582:188-194 |
| ISSN: | 0022-328X |
| Popis: | [{(η 5 -Me 5 Cp)Ni} 2 (μ-η 2 :η 2 -C 4 H 6 )] 3 was obtained from [(η 5 -Me 5 Cp)Ni(acac)] 1 and magnesiumbutadiene. The crystal structure of 3 was determined by X-ray diffraction and displays an elongated Ni–Ni bond compared with the Ni–Ni bonded dimer [{(η 5 -Cp)NiPEt 3 } 2 ] 4 containing an unbridged Ni–Ni bond. Compound 3 contains the butadiene ligand in a nonplanar s- trans arrangement bridging two (η 5 -Me 5 Cp)Ni-fragments. In situ NMR experiments show that: (a) reaction of 3 with diphenylethyne gives [{(η 5 -Me 5 Cp)Ni} 2 (μ-C 2 Ph 2 )] 5 by displacement of butadiene and (b) reaction of 3 with triethylphosphine gives a mixture of [{(η 5 -Me 5 CpNi} (μ-η 3 :η 1 - syn -C 4 H 6 )[(η 5 -Me 5 Cp)Ni(PEt 3 )] 9a and [{(η 5 -Me 5 Cp)Ni}(μ-η 3 :η 1 - anti -C 4 H 6 )(η 5 -Me 5 Cp)Ni(PEt 3 )] 9b . Compounds 5 , 9a and 9b are accessible on a preparative scale via a one pot reaction of 1 with magnesium butadiene in the presence of either tolane, or PEt 3 . The molecular structure of 9a was determined by X-ray diffraction. |
| Databáze: | OpenAIRE |
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