Methyltrioxorhenium heterogenized on commercially available supporting materials as cyclooctene metathesis catalyst

Strategies to Immobilize Well‐Defined Olefin Metathesis Catalysts: Supported Homogeneous Catalysis vs. Surface Organometallic Chemistry

“…[124] Similarly, when MeReO 3 is contacted with oxide supports, which contain Lewis acid sites, it also generates highly active catalysts such as [MeReO 3 /SiO 2 -Al 2 O 3 ], [124,125] [MeReO 3 /Al 2 O 3 ], [126] [MeReO 3 /Y zeolite], [127] and [MeReO 3 /Nb 2 O 5 ]. [128] While Re is fixed strongly (and irreversibly) to the Lewis site of the oxide supports, [125] the nature of the active site is unknown and is still under debate.…”

Zirconium phenylphosphonate-anchored methyltrioxorhenium as novel heterogeneous catalyst for epoxidation of cyclohexene

“…Various inorganic and organic materials, such as acidic metal oxides (niobia [18], [19], zeolites [20]- [24], or alumina [25]- [27]), polymers [28], [29], natural polysaccharides [30] and functionalized silica matrices [31]- [33] have been employed as supports for the immobilization of MTO. Meanwhile, several important methods for improving the catalyst performance have been revealed by surface chemistry and computational studies, for instance, the structural feature and bonding mode of the MTO species on the support surface, the beneficial pyridine effect manifested in both homogeneous and heterogeneous MTO-catalyzed epoxidation, and the modification of support surface with organic or polymeric functional groups.…”

The role of alumina in the supported Mo/HBeta–Al2O3 catalyst for olefin metathesis: A high-resolution solid-state NMR and electron microscopy study

“…Heterogeneous catalysts for metathesis reactions are of further interest due to their ease of separation, good persistence, and recyclability [4,5]. A number of solid catalysts have been reported for the olefin metathesis, the most feasible of which are those based on Re, W, and Mo [6][7][8][9][10][11][12][13][14][15][16]. Of these, supported Re 2 O 7 /Al 2 O 3 is highly active and selective even at room temperature, and its catalytic performance can be improved by using composite supports, such as Al 2 O 3 -SiO 2 [9], Al 2 O 3 -B 2 O 3 [10,11], and Al 2 O 3 -P 2 O 5 [12].…”