Diphosphan-tetraphenylnickelacyclopentadien |
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Authors: | Heinz Hoberg Wolfgang Richter |
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Institution: | Max-Planck-lnstitut für Kohlenforschung, Postfach 011325, D-4330 Mülheim a.d. Ruhr B.R.D. |
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Abstract: | Reaction of 1,2-bis(diorganophosphino)ethanenickel dibromide (I) with 1,2,3,4-tetraphenyl-1,4-dilithiumbutadiene (II) at ?30°C yields diphosphannickelacyclopentadiene (III) which at elevated temperatures isomerizes to diphosphanecyclobutadienenickel(0) (IV). The thermodynamic and kinetic parameters of the rearrangement were determined. The structural and conformational analyses of III were carried out by means of 13C NMR, 31P NMR and Raman spectroscopy. The reactions of III and IV with CH3COOH, CO, RCCR and RNCNR have been axamined and the observed reactivities III ? IV are discussed. |
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