1,3-Diketonato titanium complexes

Titanium complexes with acetylacetonate (acac) ligands were first tested for the polymerization of styrene by Ishihara et al." and Zambelli et al When activated with MAO, Ti(acac)2Cl2 and Ti(acac)3 can produce syndiotactic polystyrene with low activities, whereas their zirconium analogues only afford atactic polystyrene. Hu and coworkers studied a series of MAO activated 1,3-diketonato titanium complexes (Figure 14.11, 53-57) and found that their activities increased in the following... 

Keppler BK, Friesen C, Moritz HG, Vongerichten H, Vogel E (1991) Tumor-Inhibiting Bis (/1-Diketonato) Metal Complexes. Budotitane, cis-Diethoxybis (l-phenylbutane-1,3-dionato) titanium (IV). 78 97-128... 

Theoretical calculations at DFT level for ethylene insertion into Ti-Me bonds of cationic alkylamidinato complexes [TiMe(R1NGRNR1)2]+ (R = H, Ph R1 = H, SiMe3) have been performed,320 as have calculations for a bis(/5-diketonato)titanium model system (Scheme 137) in the presence of ethylene. Special attention is paid to the possible occurrence of agostic alkyl complexes and to the mechanism of ethylene uptake, chain propagation, and termination.321... 

Table 7.4. Experimentally determined and calculated isomer distributions ofbis(/ -diketonato) complexes of cobalt(III) and titanium(IV)1301.

Table 8.4 Experimentally determined and calculated isomers distributions of bis(p-diketonato) complexes of cobalt(lll) and titanium(IV) [255],...

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