Department of Chemistry, Faculty of Science and Engineering, Tokyo Metropolitan University, 1-1 minami Osawa, Hachioji, Tokyo 192-0397, Japan.
J Am Chem Soc. 2015 Apr 15;137(14):4662-5. doi: 10.1021/jacs.5b02149. Epub 2015 Apr 2.
(Arylimido)vanadium(V)-alkylidene complexes, V(CHSiMe3)(N-2,6-X2C6H3)(OC6F5)(PMe3)2 [X = Me (2), Cl (4)], exhibited remarkable catalytic activities for ring-opening metathesis polymerization (ROMP) of norbornene, and the ROMP by 2 proceeded in a living manner, affording ultrahigh molecular weight polymers. Cis-specific ROMP was achieved with the alkoxo analogues, V(CHSiMe3)(N-2,6-X2C6H3)[OC(CH3)(CF3)2]-(PMe3)2 [X = Me (5), Cl (6)]. Both the activity and the selectivity increased upon addition of PMe3, even at 50 °C.
（芳基亚氨基）钒（V）-亚烷基配合物，V(CHSiMe3)(N-2,6-X2C6H3)(OC6F5)(PMe3)2 [X = Me (2), Cl (4)]，对降冰片烯的开环复分解聚合（ROMP）表现出显著的催化活性，并且 2 的 ROMP 以活性质点方式进行，得到超高分子量聚合物。用烷氧基类似物，V(CHSiMe3)(N-2,6-X2C6H3)OC(CH3)(CF3)22 [X = Me (5), Cl (6)]，实现了顺式特异性 ROMP。即使在 50°C 下，添加 PMe3 也会提高活性和选择性。
