The title cationic Cp-free zirconium hydrocarbyl has been synthesized by ligand abstraction from tetrabenzylzirconium with the strong Lewis acid tris (pentafluorophenyl)boron. NMR analysis indicates that the [Zr(CH2Ph)3]+ cation is stabilized by coordination of the phenyl ring of the anion [B(CH2Ph)(C6F5)3]-, and that this structure is maintained in aromatic solvents up to 100-degrees-C. The highly electrophilic zirconium cation reacts rapidly with Lewis bases such as THF, affording the 6-coordinate [Zr (CH2Ph)3 (THF)3]+ adduct. The title compound is the first non-metallocene group 4 cationic complex which functions as a single-component olefin polymerization catalyst.
Non-metallocene Group-4 Organometallic Complexes As Catalysts For Olefin Polymerization - Synthesis and Catalytic Activity of the Cationic Complex [zr(ch2ph)3]+ [b(ch2ph)(c6f5)3]-
PELLECCHIA, Claudio;GRASSI, Alfonso;
1993-01-01
Abstract
The title cationic Cp-free zirconium hydrocarbyl has been synthesized by ligand abstraction from tetrabenzylzirconium with the strong Lewis acid tris (pentafluorophenyl)boron. NMR analysis indicates that the [Zr(CH2Ph)3]+ cation is stabilized by coordination of the phenyl ring of the anion [B(CH2Ph)(C6F5)3]-, and that this structure is maintained in aromatic solvents up to 100-degrees-C. The highly electrophilic zirconium cation reacts rapidly with Lewis bases such as THF, affording the 6-coordinate [Zr (CH2Ph)3 (THF)3]+ adduct. The title compound is the first non-metallocene group 4 cationic complex which functions as a single-component olefin polymerization catalyst.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
