The pivotal role of symmetry in the ruthenium-catalyzed ring-closing metathesis of olefins

Chiara Costabile, Annaluisa Mariconda, Luigi Cavallo, Pasquale Longo, Valerio Bertolasi, Francesco Ragone, Fabia Grisi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The synthesis of Ru-based precatalysts with N-heterocyclic carbene (NHC) ligands bearing syn- and anti-methyl groups on the NHC backbone and aryl N-substituents with differing steric bulk was carried out. The catalytic behavior of the monophospine Ru precatalysts (7 a, 7 b, 8 a, and 8 b) was compared to the corresponding family of phosphine-free catalysts (9 a, 9 b, 10 a and 10 b) in the ring-closing metathesis (RCM) of olefins. These catalysts showed high efficiency in RCM reactions and the syn-isomers 7 a and 9 a, in particular, proved to be among the most active catalysts in the formation of tetrasubstituted olefins through RCM. DFT studies on the entire RCM catalytic cycle of hindered olefins were performed to rationalize the different behaviors of catalysts with syn- and anti-methyl groups on the NHC backbone. Theoretical results not only disclosed how NHC symmetry influences the overall activity of the catalyst, but also gave relevant and more general indications on the crucial steps of the RCM of olefins.

Original languageEnglish (US)
Pages (from-to)8618-8629
Number of pages12
JournalChemistry - A European Journal
Volume17
Issue number31
DOIs
StatePublished - Jul 25 2011
Externally publishedYes

Keywords

  • density functional calculations
  • metathesis
  • N-heterocyclic carbenes
  • ring-closing metathesis
  • ruthenium

ASJC Scopus subject areas

  • Chemistry(all)

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