Catalysis of linear alkene metathesis by Grubbs-type ruthenium alkylidene complexes containing hemilabile α,α-diphenyl-(monosubstituted-pyridin-2-yl)methanolato ligands

• Tegene T. Tole,
• Johan H. L. Jordaan and
• Hermanus C. M. Vosloo

Beilstein J. Org. Chem. 2019, 15, 194–209, doi:10.3762/bjoc.15.19

• precatalysts can be attributed to electronic and steric effects associated with the adjacent bulky phenyl groups. Keywords: Grubbs-type precatalyst; hemilabile; 1-octene metathesis; pyridinyl-alcoholato ligand; Introduction The alkene metathesis reaction is now well established as a powerful synthetic tool

• pyridinyl-alcoholato ligand was in the “closed” (coordinated) position; δCHPh 18.05 ppm, δCHHx 16.71 ppm and δCHH 16.08 ppm [10]. The other two was attributed to the benzylidene (δCHPh 19.48 ppm) and methylidene (δCHH 19.76 ppm) species in the “open” (uncoordinated) position with the uncoordinated

• bidentate pyridinyl-alcoholato ligand by Me and OMe groups. We synthesised the 3-, 4-, and 5-methyl and 3-methoxy-substituted 5d precatalysts. The catalytic activity, selectivity and stability results of the Me- and OMe-substituted 5d precatalysts, in 1-octene metathesis, showed promising results at high