195008-48-1Relevant academic research and scientific papers
Photoinduced rac/meso interconversions of bridged bis(indenyl) zirconium dichlorides
Kaminsky, Walter,Schauwienold, Anne-Meike,Freidanck, Frank
, p. 37 - 42 (1996)
Upon irradiation of a C2-symmetric rac-isomer of an ansa-zirconocene dichloride, an interconversion into the C(s)-symmetric meso-form is observed until a photostationary state between the two diastereomers is reached. The final rac/meso-proportion and the interconversion rate depend on the structure of the different metallocenes. Results of α-olefin polymerization catalyzed by [Me2Si(2-Me-4,6-(i)Pr2 Ind)2]ZrCl2 rac and meso, respectively, and methylalumoxane (MAO) as cocatalyst are reported. In propene polymerization the rac-diastereomer shows the higher activity whereas in pentene, hexene, and octene polymerization the meso-isomer is significantly more active. For all polymers a lower molecular weight is found using the meso-diastereomer as catalyst.
