Exclusive C-C oxidative addition in a rhodium thiophosphoryl pincer complex and computational evidence for an ν 3-C-C-H agostic intermediate

Michael Montag, Irena Efremenko, Yael Diskin-Posner, Yehoshoa Ben-David, Jan M L Martin, David Milstein

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The room-temperature reaction between the Rh(I) precursor [Rh(COE) 2(acetone) 2]BF 4 (COE = cyclooctene) and a new thiophosphoryl-based SCS pincer ligand leads to oxidative addition of an sp 2-sp 3 C-C bond as the only observed outcome, despite the presence of accessible sp 3 C-H bonds. A DFT study reveals that the chemistry of the SCS system is controlled by π repulsion between occupied rhodium d orbitals and the lone-pair electrons on the two sulfur atoms. This repulsion gives rise to the thermodynamic selectivity for C-C over C-H cleavage, as it is attributed to the higher electronegativity of a methyl versus hydride ligand, thereby allowing more effective release of excessive π electron density. It is also demonstrated that the observed C-C and unobserved C-H cleavage pathways originate from a common intermediate that features a novel ν 3-C-C-H agostic interaction. The COE ligand is shown to play an important role by greatly stabilizing this intermediate, making it the only available entry point to both reaction pathways.

Original languageEnglish
Pages (from-to)505-512
Number of pages8
JournalOrganometallics
Volume31
Issue number1
DOIs
Publication statusPublished - Jan 9 2012

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Rhodium
rhodium
Ligands
ligands
cleavage
Electronegativity
Acetone
Sulfur
entry
Discrete Fourier transforms
Hydrides
acetone
hydrides
Carrier concentration
sulfur
selectivity
Thermodynamics
chemistry
orbitals
Atoms

ASJC Scopus subject areas

  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Exclusive C-C oxidative addition in a rhodium thiophosphoryl pincer complex and computational evidence for an ν 3-C-C-H agostic intermediate. / Montag, Michael; Efremenko, Irena; Diskin-Posner, Yael; Ben-David, Yehoshoa; Martin, Jan M L; Milstein, David.

In: Organometallics, Vol. 31, No. 1, 09.01.2012, p. 505-512.

Research output: Contribution to journalArticle

Montag, Michael ; Efremenko, Irena ; Diskin-Posner, Yael ; Ben-David, Yehoshoa ; Martin, Jan M L ; Milstein, David. / Exclusive C-C oxidative addition in a rhodium thiophosphoryl pincer complex and computational evidence for an ν 3-C-C-H agostic intermediate. In: Organometallics. 2012 ; Vol. 31, No. 1. pp. 505-512.
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