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Issue 6, 1979
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Evidence for a reversible 1,2-hydrogen shift (α elimination) in some bis(η-cyclopentadienyl)tungsten compounds

Abstract

The reaction of [W(η-C5H5)2(C2H4)Me][PF6] with PMe2Ph gives [W(η-C5H5)2(CH2CH2PMe2Ph)Me][PF6](2) which eliminates ethylene when heated to give, in sequence, [W(η-C5H5)2(CH2PMe2Ph)H][PF6](3) and [W(η-C5H5)2Me(PMe2Ph)][PF6](4). Repeating this sequence with the deuteriated methyl analogues shows that the CD3 unit in (2) is reformed quantitatively in (4) and supports the proposal that the mechanism of the reaction involves a reversible 1,2-hydrogen shift equilibrium between the intermediates [W(η-C5H5)2Me]+ and [W(η-C5H5)2(CH2)H]+. The compounds [W(η-C5H5)2L(Me)](L = SEt2 or PPh3) and [W(η-C5H5)2Me(I)] have also been prepared and treated with PMe2Ph to give (3). Some implications of the 1,2-hydrogen shift (α elimination) are discussed.

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Article information


J. Chem. Soc., Dalton Trans., 1979, 1121-1127
Article type
Paper

Evidence for a reversible 1,2-hydrogen shift (α elimination) in some bis(η-cyclopentadienyl)tungsten compounds

N. J. Cooper and M. L. H. Green, J. Chem. Soc., Dalton Trans., 1979, 1121
DOI: 10.1039/DT9790001121

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