104181-64-8Relevant academic research and scientific papers
Phenoxy substituted zirconocenes in ethylene polymerization
Repo, Timo,Jany, Gerhard,Salo, Mia,Polamo, Mika,Leskelae, Markku
, p. 363 - 366 (2007/10/03)
Zirconocene dichloride was reacted with either 2,6-di-tert-butyl-or 2,6-diisopropyl phenol to form bis(η5-cyclopentadienyl) zirconium(IV) monochloride complexes 1 and 2 respectively. A bisphenoxy derivative of Cp2ZrCl2, 3, was formed, when sterically less demanding 2,6-dimethyl phenol was utilized. The ability of the complexes 1, 2 and 3 in ethylene polymerization with MAO as cocatalyst was examined. Polymer analysis indicates that, regardless of which complex was used, only one kind of catalytically active metal center is formed and polymer properties resemble those obtained with the Cp2ZrCl2/MAO system. The solid state structure of bis(η5-cyclopentadienyl) zirconium(IV) 2,6-di-tert-butyl-phenoxy monochloride (1) is reported.
Bulky Metal Aryloxides, Arylamides, and Sulphur and Phosphorus Analogues Part 1. Synthetic and Chemical Studies of Titanium and Zirconium Aryloxides
Duff, Alan W.,Kamarudin, Rose A.,Lappert, Michael F.,Norton, Reginald J.
, p. 489 - 498 (2007/10/02)
The synthesis and characterisation of several classes of aryloxides (OR) of TiIV, TiIII, ZrIV, and Li are described.Those of TiIV are of eight distinct classes: , , , , , , , and (R' = alkyl, thf = tetrahydrofuran); the TiIII complexes are of types n> and ; the ZrIV complexes are of seven types: and , with X = OR, Cl, NMe2, OMe, OC(O)NMe2, or N(Ph)CNMe2; the new lithium aryloxides have formula n.Most of the results relate to the ligands 2,6-Me2C6H3O-, 2,6-Pri2C6H3O-, 2,6-But2C6H3O-, 4-Me-2,6-But2C6H2O-, 2,4,6-But3C6H2O-, 3,5-ButC6H3O-, and 2,4-But2C6H3O-.The new complexes are readily soluble in diethyl ether and many also in hydrocarbons.Synthetic procedures include the following systems: (i) LiBun-ROH-OEt2, for Li aryloxides; (ii) TiIV, TiIII, or ZrIV chlorides with n; (iii) for TiIII, a redox reaction of type (ii) using a TiIV chloride as precursor; (iv) a TiIV or ZrIV dimethylamide and ROH; and (v) for the ZrIV carbamate or ZrIV urea, a CO2 or PhNCO insertion into the appropriate ZrIV dimethylamide.
