Abstract
η 5-Cyclopentadienyl-η 1-η 2-alk-4-enylnickel complexes has been prepared by treatment of nickelocene either with the appropriate alkenylmagnesium halide or with isopropylmagnesium bromide and an alkadiene. 1H and 13C NMR results indicate that the C=C bond is complxed to the nickel atom. The cyclopentadienylalk-3-enylnickel compounds do not isomerize to the corresponding cyclopentadienyl-η 3-allylnickel complexes, if β-H-elimination is suppressed by substituting β-H by methyl. Cyclopentadienylalk-5-enylnickel compounds isomerize readily to the alk-4-enylnickel complexes.
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