Dendrimer crown-ether tethered multi-wall carbon nanotubes support methyltrioxorhenium in the selective oxidation of olefins to epoxides

Abstract

Benzo-15-crown-5 ether supported on multi-wall carbon nanotubes (MWCNTs) by tethered poly(amidoamine) (PAMAM) dendrimers efficiently coordinated methyltrioxorhenium in the selective oxidation of olefins to epoxides.

Assembly of SBA‐15 Derived Hybrid Heterogeneous Catalysts for Liquid Phase Cyclopentene Epoxidation

“…Indeed, recyclability test testified that no significant leaching of W species occurred and SBA-15-NH(PO 3 H 2 )-W could be recycled 10 times, and the use of a low dose of heterogeneous catalyst (W = 20 μmol) and a green oxidant of H 2 O 2 , along with the absence of co-solvent or other additives makes cyclopentene epoxidation reaction an environmenttally benign chemical process. Moreover, additional investigation of these materials, including catalytic performance in other olefins epoxidation reactions, [27] is still required for deep understanding.…”

Dendrimeric Structures in the Synthesis of Fine Chemicals

“…PAMAM dendrimers can also perform as a coordinative functional platform for the immobilization of reactive heavy-metal/benzo-15-crown-5 ether complexes on multi-wall carbon nanotubes (MWCNTs) [ 61 ]. Three different heterogeneous catalysts were obtained by the following procedures: (i) introduction of ethylene diamine spacer on inert MWCNTs and decoration of the amine functionalities with benzo-15-crown-5 ether to yield linear dendrimer species ( Scheme 12 ); (ii) dendrimerization of the diamine spacer on the carbonaceous nanotube by methyl acrylate addition followed by crown ether coupling ( Scheme 13 ).…”

Dendritic polyamide-amine modified phosphomolybdovanadic hybrid microspheres as a catalyst for methacrolein to methacrylic acid

“…22,23 In recent years, the development of dendritic HPA hybrids has led to the advancement of novel catalysts for various oxidation reactions. [24][25][26][27] Among those screened, Chen 17 synthesized dendritic phosphotungstate hybrids for the selective oxidation of alcohols by H 2 O 2 through introducing H 3 PW 12 O 40 into the PAMAM matrix, while endowing the hybrids with a reusable phase transfer function. Song et al 28 prepared highly active Na 5 CoII(H 2 O) PW 11 O 39 /PAMAM organic-inorganic composites for liquidphase oxidation of isobutyraldehyde (IBA) to isobutyric acid (IBAC).…”