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Bite angle dependence of the rate of reductive elimination from diphosphine palladium complexes

Authors
Journal
Inorganica Chimica Acta
0020-1693
Publisher
Elsevier
Publication Date
Volume
220
Identifiers
DOI: 10.1016/0020-1693(94)03876-7
Keywords
  • Key Words: Bite Angle
  • Reductive Elimination
  • Palladium Complexes
  • Alkyl Complexes
  • Diphosphine Complexes

Abstract

Abstract The thermal stability of a set of complexes of the type P 2PdMeR, generated in situ, has been investigated in the temperature range −30 °C to ambient, with the intention of determining the relationship between the ligand bite angle and reactivity in reductive elimination. In this series P 2 was either 1,3-(diphenylphosphino)propane (dppp), 1,1′-(diphenylphosphino)ferrocene (dppf) or 1,1′-(diphenylphosphino)ruthenocene (dppr), and R was phenyl or E-2-(4-methoxyphenyl)ethenyl. Clear trends were observed; the dppp complexes were much more stable than the others, and the phenylpalladium complexes were more stable than their vinylpalladium counterparts. The observed trends fit with the idea that the reductive elimination step in palladium cross-coupling is facilitated by a ligand with a large interchelate angle. The dppr complexes were significantly more labile than their dppf analogues.

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