The formation of the cationic species is achieved after rac- 1 is methylated to form rac-(EBI)ZrMe2 (rac- 2 ) by MAO and/or free Al2Me6 contained in MAO. The same sequential reaction has been performed by using rac(EBI)ZrCl2 (rac- 3 ) for the comparison. MAO cannot generate the...
In the NMR-scale reaction using CD2Cl2 as a solvent, a small amount of MAO ([Al]/[Zr] = 30) was enough to completely activate rac -1 to give cationic methylzirconium cations that can polymerize propylene. The resulting isotactic polypropylene (iPP) isolated in this reaction showed ...