Well-Defined Ruthenium Olefin Metathesis Catalysts: Mechanism and Activity

摘要

Several ruthenium-based olefin metathesis catalysts of the formula (PR_3)_2X_2Ru=CHCHCPh_2 have been synthesized, and relative catalyst activities were determined by monitoring the ring-closing metathesis of the acyclic diene diethyl diallylmalonate. The following order of increasing activity was determined: X=I＜Br＜Cl and PR_3=PPh_3≤P~ⅰPr_2Ph＜PC_y2Ph＜P~ⅰPr_3＜PC_y3.