Efficient Polymer-Supported Sharpless Alkene Epoxidation Catalyst

Abstract

Homogeneous linear poly(tartrate ester) ligands provide high chemical yields and enantiomeric excesses in the epoxidation of trans-hex-2-en-1-ol using Ti(OPr i ) 4 -tert-butyl hydroperoxide. Branched poly(tartrate ester) can be use as heterogeneous ligands in the epoxidation of trans-hex-2-en-1-ol using Ti(OPr i ) 4 -tert-butyl hydroperoxide. Removal and recovery of the polymer catalyst is a simple filtration at the end of reactions.

Polymer‐supported reagents, catalysts, and sorbents: Evolution and exploitation—A personalized view

“…With regard to the application of supported reactive species in chemistry, we have contributed in terms of polymeric reagents (phosphines,39, 71 peracids,72 and chiral borohydride73) and polymer‐supported chiral74 and achiral75 phase‐transfer catalysts and, perhaps most importantly of all, in the area of polymer‐supported transition‐metal complex catalysts, notably supported Pd(II),76 Mo (VI),77 V(V),78 Ti (IV),79 Mn (III),80 Pt(O),81 and Pd(O)82 species. Reactions and processes of interest have varied from commodity chemicals76, 77 to fine chemicals, the latter involving primarily asymmetric catalytic systems 79, 80. Much of the work we have described has been of technological potential, and commercialization of some of these systems remains on the agenda.…”

Oxidation of phenol, styrene and methyl phenyl sulfide with H2O2 catalysed by dioxovanadium(V) and copper(II) complexes of 2-aminomethylbenzimidazole-based ligand encapsulated in zeolite-Y

“…There are three general methods to heterogenise homogeneous catalysts: (i) by polymerization of homogeneous catalyst itself [1][2][3][4][5] and thus making them insoluble in solvents, (ii) by immobilization of homogeneous catalyst through covalent bonding with polymeric materials [6][7][8][9] or materials like functionalized MCM-41, SBA-15, etc. [10,11] and (iii) by encapsulating them in the nanocavity of, e.g.…”

Polymer-anchored oxoperoxo complexes of vanadium(V), molybdenum(VI) and tungsten(VI) as catalyst for the oxidation of phenol and styrene using hydrogen peroxide as oxidant

“…Immobilization of the homogeneous catalysts on insoluble polymer support is more specialized method because this enhances the thermal stability, selectivity, recyclability and easy separation of the catalyst from reaction products leading to the operational flexibility [8,9]. Chloromethylated polystyrene crosslinked with divinylbenzene is one of the most widely employed macromolecular supports for immobilization of homogeneous catalysts [10][11][12][13][14][15]. Synthetic organic chemistry and pharmaceutical industry have used such catalyst considerably [16,17].…”