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THERMAL DECOMPOSITION OF η5-CYCLOPENTADIENYL-η2-PROPENEALKYLNICKEL COMPLEXES
Pasynkiewicz, S.,Lehmkuhl, H.
, p. 189 - 200 (2007/10/02)
Thermolysis of compounds of the type CpNiR (η2-propene) (R=CH3 (1), CD3 (2), CH2CH3 (3), CH2CH2CH3 (4) and CH2SiMe3 (5)) was studied.The methyl complex 1 gives mainly methane, ethane and (CpNi)3CH.Toluene-d8 has no effect on the composition of the gaseous products and does not yield gases containing deuterium.In the CD3 complex 2 a H-D exchange reaction between the complexed propene and the CD3 group takes place.Decomposition of the trimethylsilylmethyl complex 5 gave tetramethylsilane.The complexes 3 and 4 containing a β-hydrogen atom, decompose via a β-elimination reaction giving the corresponding olefin.The unstable formed in the reaction reacts with giving the corresponding alkane and a mixture of non-isolated cyclopentadienylnickel clusters.The complexes studied undergo insertion of the coordinated olefin into the Ni-C ?-bond, which results in the formation of higher hydrocarbons.
