An ionic liquid-tagged second generation Hoveyda–Grubbs ruthenium carbene complex as highly reactive and recyclable catalyst for ring-closing metathesis of di-, tri- and tetrasubstituted dienes

Synthesis of Polypentenamer and Poly(Vinyl Alcohol) with a Phase‐Separable Polyisobutylene‐Supported Second‐Generation Hoveyda–Grubbs Catalyst

“…Some of the most commonly employed strategies to obtain supported metathesis catalysts consist of immobilizing the ruthenium alkylidene complex on to insoluble polymers, [19][20][21][22] soluble polymers, [23][24][25][26] inorganic supports, 27-29 perfluorinated 30,31 and ionic-liquid tags. [32][33][34][35] ( Figure 1). Herein we will focus on the use of soluble polymer supported Nheterocyclic carbene (NHC) Ru metathesis catalysts.…”

Toward green catalytic synthesis—Transition metal-catalyzed reactions in non-conventional media

“…An almost identically tagged, second generation Grubbs-Hoveyda ruthenium carbene complex was reported by Yao et al [359,360]. The complex was highly active for the RCM of di-, tri-and tetra-substituted diene and enyne Scheme 49. substrates in the mixed solvents ([bmim]PF 6 /CH 2 Cl 2 , 1/9).…”

RTILs in Catalytic Olefin Metathesis Reactions

“…The more reactive second generation of both types of complexes was logically prepared shortly after the first generation with the aim of increasing the stability of the catalysts and improving their performances with sterically demanding substrates [66,67]. These goals were only partially reached since complex C8 proved ineffective for the challenging RCM of 18 even under optimized solvent mixture of [bmim] [PF 6 ]/toluene (25/75) whereas it could be reused in the RCM of 16 and 17 (Scheme 12) [68].…”