Group 4 metallocenes are important as reagents and catalysts. Besides their use as Ziegler-Natta catalysts they are also able to promote the catenation of silicon atoms to polysilanes. For this and other reasons the synthesis and investigation of silylated metallocenes has developed to an important area of research. It is striking that titanium is the least understood metal in this conjunction. Recent studies from our group have shown that titanium silyl compounds show a much stronger preference for the oxidation state +3 than expected. A more detailed investigation has shown that certain silyl groups also promote the stabilization of the oxidation state +3 for zirconium and hafnium. While metallocenes in the oxidation state +4 are extremely well investigated, information about the corresponding compounds in the oxidation state +3 is scarce. Preliminary results to this project have disclosed a novel synthetic access to these compounds which might be very general. A simple access to low-valent zircono- and hafnocenes would be particularly useful to investigate the properties and potential of these compounds in some detail.
|Effective start/end date||12/01/09 → 11/06/12|