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, -N3, -NCO, -CNO, -NCS, and -NCSe.
Specific embodiments for these catalysts are:
本发明涉及新型
钌基和
锇基催化剂,用于具有高 Z 选择性的烯烃偏析反应。这种效果是通过利用两种立体要求非常不同的单阴离子
配体(X)和(L1)获得的。即使在有空气或酸存在的情况下,催化剂也能选择性地提供 Z 异构体。
权利要求为式 (A) 和 (B);
阴离子
配体 "X "定义为-CN、-N3、-NCO、-CNO、-
NCS 和-
NCSe。
这些催化剂的具体实施例如下: