Reactions of nickelocene with methyl-, ethyl- and vinyl-lithium compounds. Hydrogen elimination and cyclopentadienyl ring hydrogenation |
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| Authors: | S Pasynkiewicz W Buchowicz J Pop
awska A Pietrzykowski J Zachara |
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| Institution: | Faculty of Chemistry, Warsaw Technical University, Koszykowa 75, 00-662, Warsaw, Poland |
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| Abstract: | It has been shown that bis(cyclopentadienyl)(μ-cyclopentadiene)dinickel, (NiCP)2(η-C5H6), and (η5-cyclopentadienyl) (η3-cyclopentenyl)nickel, CpNi(η3-C5H7), are formed in the reaction of nickelocene with methyl-lithium and with 1-phenyl-2-methyl-propenyl-lithium. The compound (NiCp)2(μ-C5H6) can be only formed as a result of the reduction of the cyclopentadienyl ring bonded to the nickel atom whereas the formation of CpNi(η3-C5H7) can be explained by the further hydrogeneration of cyclopentadiene formed in the earlier reaction steps. (NiCp)2(μ-C5H6) has been fully characterised spectrometrically and its X-ray structure determined. It crystallises in the orthorhombic system, space group Pnma, with four molecules per unit cell. |
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| Keywords: | Nickel Lithium Cyclopentadienyl Nuclear magnetic resonance X-ray diffraction Crystal structure |
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