Abstract
(Arylimido)vanadium(V) complexes containing anionic ancillary donor ligands of type, V(NAr)Cl2(L) (Ar = 2,6-Me2C6H3, L = aryloxo, ketimide phenoxyimine, etc.) exhibited high catalytic activities for ethylene polymerization in the presence of Al cocatalyst; V(NAr)Cl2(O-2,6-Me2C6H3) showed the exceptionally high activities in the presence of halogenated Al alkyls such as Et2AlCl, EtAlCl2, etc. (Arylimido)vanadium(V)-alkylidene complexes, V(CHSiMe3)(NAr)(L′) (L′ = N=CtBu2, O-2,6-iPr2C6H3) exhibited the remarkable catalytic activities for ring-opening metathesis polymerization of norbornene. (Imido)vanadium(V) complexes containing the (2-anilidomethyl)pyridine ligand, V(NR)Cl2[2-Ar′NCH2(C5H4N)] (R = 1-adamantyl, cyclohexyl, phenyl, Ar′ = 2,6-Me2C6H3, 2,6-iPr2C6H3), exhibit the remarkable activities for ethylene dimerization in the presence of MAO, affording 1-butene exclusively (selectivity 90.4 to >99%). The steric bulk of the imido ligand plays an important role in the selectivity, and the electronic nature directly affects the activity.
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Acknowledgments
K.N. expresses his heartfelt thanks to former group members who contributed this project as coauthors, and S.Z. expresses his sincere thanks to JSPS for a postdoctoral fellowship (P08361). The research by K.N. was partly supported by Grant-in-Aid for Scientific Research on Priority Areas (No. 19028047, “Chemistry of Concerto Catalysis”) from Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Zhang, S., Nomura, K. (Imido)vanadium Complexes as Efficient Catalyst Precursors for Olefin Polymerization/Oligomerization. Catal Surv Asia 15, 127–133 (2011). https://doi.org/10.1007/s10563-011-9116-x
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DOI: https://doi.org/10.1007/s10563-011-9116-x