meta- and para-Bis[zirconyl(IV)amino]cyclophanes; 1,3- or 1,4-C6H4[N(SiMe3)]2 as bridging ligands†
Abstract
The structurally characterised meta- and para-dimetallacyclophanes [RN(C6H4)N(R)Zr(NMe2)2N(R)(C6H4)N(R)Zr- (NMe2)2] (R = SiMe3), obtained from [{Zr(NMe2)3(µ-NMe2)}2] and C6H4[N(H)R]2-1,3 or -1,4 (2 mol), are catalysts (with methylaluminoxane) for the polymerisation of ethylene.