title: Z-Selective olefin metathesis reactions promoted by tungsten oxo alkylidene complexes.
abstract: Addition of LiOHMT (OHMT = O-2,6-dimesitylphenoxide) to W(O)(CH-t-Bu)(PMe(2)Ph)(2)Cl(2) led to WO(CH-t-Bu)Cl(OHMT)(PMe(2)Ph) (4). Subsequent addition of Li(2,5-Me(2)C(4)H(2)N) to 4 yielded yellow W(O)(CH-t-Bu)(OHMT)(Me(2)Pyr)(PMe(2)Ph) (5). Compound 5 is a highly effective catalyst for the Z-selective coupling of selected terminal olefins (at 0.2% loading) to give product in >75% yield with >99% Z configuration. Addition of 2 equiv of B(C(6)F(5))(3) to 5 afforded a catalyst activated at the oxo ligand by B(C(6)F(5))(3). 5·B(C(6)F(5))(3) is a highly active catalyst that produces thermodynamic products (~20% Z).
authors: Department of Chemistry 6-331, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: Dmitry V
authors: DV
authors: Peryshkov
authors: Richard R
authors: RR
authors: Schrock
authors: Michael K
authors: MK
authors: Takase
authors: Peter
authors: P
authors: Müller
authors: Amir H
authors: AH
authors: Hoveyda
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D002384:Catalysis; D056831:Coordination Complexes / Q000737:chemistry*; D008968:Molecular Conformation; D014414:Tungsten / Q000737:chemistry*
chemical_list: D000475:Alkenes; D056831:Coordination Complexes; D014414:Tungsten