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The η 5 -cyclopentadienyl-bis(η 2 -methylenecyclopropane)cobalt complexes 5 and 6 were prepared by reaction of CpCo-bis(ethylene) (4) with methylenecyclopropane (1) and 2,2,3,3-tetramethylm ethylenecyclopropane (2), which on heating isomerise via non-isolable cobaltacyclopentanes and 4-m ethylene-cobaltacyclohexanes to give the CpCo-1,3-butadiene derivatives 10, 11 and 12. The same type of isomerisation can be observed by reacting CpCo(triphenylphosphane)( acrylonitrile) with 1 leading to the CpCo-1,3-butadiene derivative (15). With diphenylm ethylenecyclopropane (3) only a CpCo-monomethylenecyclopropane complex is formed, which isomerises immediately to give CpCo(1,1-diphenyl-1,3-butadiene) (13) and in minor amounts the fluxional binuclear cobalt complex 14. All new cobalt complexes were fully characterised by means o f high resolution NM R spectroscopy.

zeitschrift für naturforschung b

Metallacycloalkane, VIII η 5 -Cjclopentadienyl-η 2 -methylencyclopropan-Cobaltkomplexe und deren Umwandlung in η 4 -Butadien-Cobaltkomplexe über Cobaltacyclopentane/ Metallacycloalkanes. VIII η 5  -Cyelopentadienyl-η 2 -Methylenecyclopropane Complexes of Cobalt and their Transformation into η 4 -Butadiene Complexes via Cobaltacyclopentanes