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Dynamic and Polymerization Behavior of Tetrabenzofluorenyl Titanium Complexes

6 DYNAMIC AND POLYMERIZATION BEHAVIOR OF TETRABENZOFLUORENYL TITANIUM COMPLEXES [Pg.117]

NMR spectroscopy reveals that in solution, both isomers rapidly interconvert as instead of a twofold signal set, which would be indicative of two isomers, only half the signal set can be observed at ambient temperature. Thus, temperature-dependent NMR experiments were conducted in order to determine the energetic barrier for interconversion of both isomers (Rg. 6.19). [Pg.117]

Run No. Catalyst Polymerization Time (min) Activity Melting Point (°C) [Pg.120]

The efficient syntheses of IVa allows an effective access to the organometallic chemistry of the Tbf moieties. Using the remarkable r -coordinated lithium salts y and VI, monosubstituted titanium(IV) alkoxides and aryloxides become available. The Tbf moiety is coordinated as a sterically demanding Cp derivative in an ii fashion to the titanium centers. The formal benzannula-tion of the fluorenyl system, as present in the Tbf titanium complexes, leads to large mono Cp complexes of high thermal stability compared to ii -fluorenyl titanium derivatives. Due to its heUcal twist, the T -coordinated Tbf ligands show Cl symmetry in the solid state but seem to interconverse in solution. Additionally, the titanium complexes were subjected to polymerization experiments of styrene to some extent. [Pg.120]

Janiak, C, Schumann, H. Bulky or supracyclopentadienyl derivatives in organo-metalUc chemistry. Adv. Organomet. Chem.,33,291-393 (1991). [Pg.120]




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