Synthesis, Characterization, and Ethylene Polymerization Activities of Neutral Nickel(II) Complexes Derived from Anilino-Substituted Enone Ligands Bearing Trifluoromethyl and Trifluoroacetyl Substituents
作者:Lei Zhang、Maurice Brookhart、Peter S. White
DOI:10.1021/om050931p
日期:2006.4.1
A series of neutral Ni(II) complexes derived from anilino-substituted enone ligands bearing electron-withdrawing trifluoromethyl and trifluoroacetyl groups have been synthesized and characterized: [η2-ArNC(R1)CC(R2)C(O)CF3]Ni(PPh3)Ph (3a, Ar = 3,5-i-Pr2C6H3, R1 = H, R2 = COCF3; 3b, Ar = 3,5-i-Pr2C6H3, R1 = Me, R2 = COCF3; 3c, Ar = 3,5-i-Pr2C6H3, R1 = Me, R2 = H; 3d, Ar = 3,5-Me2C6H3, R1 = Me, R2 =
一系列衍生自中性的Ni(II)复合物的苯胺基取代的配体烯酮轴承吸电子三氟甲基和三氟乙酰基团已被合成和表征:[η 2 -ArNC(R 1)C C(R 2)C(O)CF 3 ] Ni(PPh 3)Ph(3a,Ar = 3,5- i -Pr 2 C 6 H 3,R 1 = H,R 2 = COCF 3 ; 3b,Ar = 3,5- i -Pr 2 C 6 H 3,R 1 = Me,R 2= COCF 3;3c,Ar =3,5- i- Pr 2 C 6 H 3,R 1= Me,R 2= H;3d,Ar = 3,5-Me 2 C 6 H 3,R 1= Me,R 2= COCF 3)。当它们被Ni(COD)2或B(C 6 F 5)3活化时,这些络合物对于乙烯聚合成支链聚乙烯具有活性。配合物3a特别活跃且寿命长,周转频率为5×105,在60℃和乙烯为200psig,半衰期在35℃下超过15小时,和一个总转换数超过10