Synthesis and Reactivity of Ruthenium Phosphite Indenylidene Complexes

Xavier Bantreil, Albert Poater, Cesar A. Urbina-Blanco, Yannick D. Bidal, Laura Falivene, Rebecca A. M. Randall, Luigi Cavallo, Alexandra M. Z. Slawin, Catherine S. J. Cazin

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

The synthesis of the four olefin metathesis precatalysts Caz-1a-d, featuring the NHC ligand N,N'-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene (SIMes) and four different phosphites (P((OPr)-Pr-i)(3), P(OPh)(3), P(OEt)(3), and P(OMe)(3)), is reported. The complexes are readily synthesized from commercially available [RuCl2(3-phenylinden-1-ylidene)-(pyridine)(SIMes)] (Ind-III) in yields of up to 88%. These complexes adopt an unusual cis configuration between the phosphite and the NHC ligands. NMR experiments and computational studies confirm that the cis complexes are thermodynamically favored in comparison to their trans counterparts. In addition, the isomerization from trans to cis occurs via a mononuclear and non-dissociative mechanism. Among the four precatalysts, cis-Caz-1a, featuring a P((OPr)-Pr-i)(3) ligand, displays the highest activity in ring-closing metathesis and cross-metathesis transformations. Experiments at low catalyst loadings demonstrated the potential of this catalyst, allowing better conversions than with commonly used commercially available precatalysts.

Original languageEnglish
Pages (from-to)7415-7426
Number of pages12
JournalOrganometallics
Volume31
Issue number21
DOIs
Publication statusPublished - 12 Nov 2012

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