New olefin metathesis catalysts with fluorinated unsymmetrical imidazole-based ligands
作者:Timur R. Akmalov、Salekh M. Masoud、Dmitry A. Petropavlovskikh、Maria A. Zotova、Sergey E. Nefedov、Sergey N. Osipov
DOI:10.1016/j.mencom.2018.11.015
日期:2018.11
Newolefinmetathesiscatalysts, unsaturated analogues of the Grubbs II and Hoveyda–Grubbs II ones, bearing bulky (alkoxy)hexafluoroisopropyl groups in one of the aryl substituent of NHC ligand provide high conversions in model ring closing metathesis of diallyl- and allylmethallylmalonates.
Metathesis Catalysts with Fluorinated Unsymmetrical NHC Ligands
作者:Salekh M. Masoud、Artur K. Mailyan、Vincent Dorcet、Thierry Roisnel、Pierre H. Dixneuf、Christian Bruneau、Sergey N. Osipov
DOI:10.1021/om501077w
日期:2015.6.8
The synthesis of new fluorinated ruthenium(II) carbene second-generation precatalysts with unsymmetrical N-heterocyclic carbene ligands has been developed. The reaction profiles of these complexes have been studied in RCM with model substrates such as diethyl diallyl- and allylmethallyl-malonate, and CM model reaction of allylbenzene with 1,4-diacetoxybut-2-ene. In olefin metathesis reactions, the new fluorinated second-generation Grubbs complexes exhibit comparable activity with respect to commercially available Grubbs catalysts. On the other hand, in RCM reactions, the Hoveyda-type catalysts present a latent character, which is not present in the classical second-generation Hoveyda catalyst.