α-Zirconium phosphonates as new supports for metallocene catalysts

“Bound but Not Gagged”Immobilizing Single-Site α-Olefin Polymerization Catalysts

“…Bochmann and co-workers recently reported the first application of homoleptic and mixed α-zirconium phosphonates as support material for metallocene precatalysts . The supports were impregnated with zirconocene dichloride (sublimation or slurry methods), while Cp*ZrCl 3 was covalently attached to a functionalized α-zirconium phosphonate α-Zr(O 3 PR) 2 -n (O 3 PCMe 2 CH 2 OH) n (Scheme ).…”

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

“…Zirconium phosphonates Zr(O 3 PR) 2 (R = organic groups), with each layer consisting of planes of 5 zirconium bridged through phosphonate groups that alternate above and below the Zr atom planes, oriented away from the basal surfaces in a bilayered fashion in the interlayer region, have various surface and structure characteristics which allows zirconium phosphonates with potential opportunities for novel catalysts and precursors or supports of catalysts [36]- [39]. Specifically, zirconium phosphonates have been developed as catalysts for esterification of acetic acid with ethanol [36], synthesis pyrroles by Paal-Knorr condensation [37], oxidation of phenol [38], and as supports for metallocene polymerization catalysts [39]. As crystalline compounds could provide a well-defined uniform support surface, the two-dimensional geometry prevents substrate transport limitations.…”

UV‐curable nanocomposites containing zirconium vinylphosphonate or zirconia

“…Zirconium vinylphosphonate (ZrVP) hybrid material was obtained by hydrothermal method according to Refs. 39 and 40 at nanosized scale.…”