Investigations into the stability of tethered palladium(II) pincer complexes during heck catalysis

William J. Sommer, Kunquan Yu, John S. Sears, Yaying Ji, Xiaolai Zheng, Robert J. Davis, C. David Sherrill, Christopher W. Jones, Marcus Weck

Research output: Contribution to journalArticle

Abstract

A variety of palladated PCP pincer complexes are covalently tethered onto polymeric and silica supports via either amide or ether linkages and are evaluated in the Heck reaction of iodobenzene and n-butyl acrylate. The decomposition under reaction conditions of all complexes studied is established through poisoning and kinetic studies. Furthermore, the initial steps of the decomposition pathway of PCP as well as SCS pincer Pd(II) complexes are proposed and validated using in situ NMR, mass spectroscopy, and XAS as well as computational methods. These findings together with our previous reports strongly suggest that all Pd(II) pincer complexes are simply precatalysts during the Heck reaction that decompose to form catalytically active Pd(0) species.

Original languageEnglish (US)
Pages (from-to)4351-4361
Number of pages11
JournalOrganometallics
Volume24
Issue number18
DOIs
StatePublished - Aug 29 2005

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Palladium
Catalysis
catalysis
palladium
Decomposition
Computational methods
Amides
Silicon Dioxide
Ether
decomposition
poisoning
Nuclear magnetic resonance
Spectroscopy
acrylates
linkages
amides
Kinetics
ethers
mass spectroscopy
silicon dioxide

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry

Cite this

Investigations into the stability of tethered palladium(II) pincer complexes during heck catalysis. / Sommer, William J.; Yu, Kunquan; Sears, John S.; Ji, Yaying; Zheng, Xiaolai; Davis, Robert J.; Sherrill, C. David; Jones, Christopher W.; Weck, Marcus.

In: Organometallics, Vol. 24, No. 18, 29.08.2005, p. 4351-4361.

Research output: Contribution to journalArticle

Sommer, WJ, Yu, K, Sears, JS, Ji, Y, Zheng, X, Davis, RJ, Sherrill, CD, Jones, CW & Weck, M 2005, 'Investigations into the stability of tethered palladium(II) pincer complexes during heck catalysis', Organometallics, vol. 24, no. 18, pp. 4351-4361. https://doi.org/10.1021/om048992v
Sommer, William J. ; Yu, Kunquan ; Sears, John S. ; Ji, Yaying ; Zheng, Xiaolai ; Davis, Robert J. ; Sherrill, C. David ; Jones, Christopher W. ; Weck, Marcus. / Investigations into the stability of tethered palladium(II) pincer complexes during heck catalysis. In: Organometallics. 2005 ; Vol. 24, No. 18. pp. 4351-4361.
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