| 摘要 |
The present invention refers to novel ruthenium- and osmium-based catalysts for olefin metathesis reactions with high Z-selectivity. The effect is obtained by utilising two monoanionic ligands (X) and (L1) of very different steric requirement. The catalysts selectively provide the Z-isomer even in presence of air or of acids.
Claimed are formulae (A) and (B);
The anionic ligand "X" is defined as -CN, -N 3 , -NCO, -CNO, -NCS, and -NCSe.
Specific embodiments for these catalysts are: |
