Stereoselective synthesis of functionalized hexene oligomers catalyzed by chiral ansa-zirconocene in the presence of Al- and B-containing activators

Enantiomerically enriched (38–93% ee) diastereomerically pure (99% dr) functionally substituted dimers and oligomers with the starting Me-group were obtained by the reaction of 1-hexene with AlMe₃ in the presence of enantiomerically pure dichloro[(R,R)-ethylenebis(4,5,6,7-tetrahydroinden-1-yl)]- zirconium(IV). Modified methylaluminoxane MMAO-12 as the activator was somewhat superior to boron-containing compound [Ph₃C][B(C₆F₅)₄].