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New Synthetic Methodology and Biologically Active Substances
Authors:Colin Eaborn
Affiliation:School of Chemistry and Molecular Sciences, University of Sussex, Brighton BN1 9QJ Great Britain
Abstract:The η5-cyclopentadienyl-η2-propenealkylnickel complexes 4–9 (alkyl  CH3, CD3, CH2SiMe3, CH2 CH3, CH2 CH2 CH3 and CH(CH3)2) have been prepared by treating nickelocene (1) with the appropriate organomagnesium halides 2a–2f and propene at ?20 to ?10°C. Temperature dependent 1H-NMR spectra result from rotation of the propene molecule around the nickel—olefin axis; in the case of 4 and 8, two rotamers a and b can be distinguished below ca. ?60°C. The decomposition pathways for 4 and 8 are discussed.
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