A Thermally Switchable Latent Ruthenium Olefin Metathesis Catalyst

A latent s‐chelated ruthenium benzylidene initiator for ring‐opening metathesis polymerization

“…6 Recently, we developed highly stable sulfur-chelated ruthenium complexes that display latency at room temperature, and determined that their activities at higher temperatures could be modulated as a function of steric acceleration factors. 7 As dormancy in polymerization reactions is a sought asset, 8 we decided to study whether this appealing characteristic is maintained in Additional Supporting Information may be found in the online version of this article.…”

Latent sulfur chelated ruthenium catalysts: Steric acceleration effects on olefin metathesis

“…With this in mind, we envisioned that the use of a sulfur chelating atom on an analogue of Hoveyda-Grubbs catalyst 2 would strengthen the ligation to ruthenium and lower the reaction rate. Thus, we reported the synthesis, characterization and thermo-switchable olefin metathesis activity of a latent sulfur chelated ruthenium catalyst [6]. A different approach to influence reactivity of olefin metathesis catalysts is by steric effects.…”

Latent and Delayed Action Polymerization Systems

“…An intriguing case is finally found in S ‐chelating alkylidene ligands. Lemcoff and co‐workers were able to show that the sulphur‐containing analogue to the Grubbs‐Hoveyda catalyst exists in cis ‐dichloro configuration ( 60 ) . The catalyst displayed excellent latent properties in RCM, and even allowed for switching between “on–off” states repeatedly, by simple change of reaction temperature.…”