It is generated by the reduction of the Zr(IV) parent complex using excess sodium amalgam (Scheme 1, top), however, if the isopropyl groups are replaced by phenyl groups, the Zr(IV) starting material could not be generated (Scheme 1, bottom).
It is generated by the reduction of the Zr(IV) parent complexusing excess sodium amalgam (Scheme 1, top), however, if the isopropylgroups are replaced by phenyl groups, the Zr(IV) startingmaterial could not be generated (Scheme 1, bottom).