The Key Role of the Nonchelating Conformation of the Benzylidene Ligand on the Formation and Initiation of Hoveyda-Grubbs Metathesis Catalysts
作者:Bartosz Bieszczad、Michał Barbasiewicz
DOI:10.1002/chem.201501959
日期:2015.7.13
Experimental studies of Hoveyda–Grubbsmetathesiscatalysts reveal important consequences of substitution at the 6‐position of the chelating benzylideneligand. The structural modification varies conformational preferences of the ligand that affects its exchange due to the interaction of the coordinating site with the ruthenium center. As a consequence, when typical S‐chelated systems are formed as
Probing of the Ligand Anatomy: Effects of the Chelating Alkoxy Ligand Modifications on the Structure and Catalytic Activity of Ruthenium Carbene Complexes
Structural modifications of the Hoveyda–Grubbs ruthenium metathesis complex via electronic and structural withdrawing of the chelatingalkoxyligand were investigated. By decreasing the donor properties of the oxygen atom, an acceleration in catalyticactivity was achieved based on facilitation of the initiation step. Conformational constraints of the chelating ether linkage led to the unexpected disturbance