contrast, the [AlOC(CF3)3}4]- anion in 7 is much more stable and gives rise to a highly active and longer lived catalyst. The overall productivity and selectivity of the catalyst is dependent upon both cocatalyst stability and the nature of the anion present, and a reason for this effect has been suggested. Selectivity control by the cocatalyst has been ascribed to interaction of the anion with the
已经研究了将Cr /
PNP / AlEt 3催化剂体系与多种助催化剂结合使用将
乙烯三聚和四聚为
1-己烯和1-
辛烯的方法。助催化剂B(C 6 F 5)3(1),Al(OC 6 F 5)3(2),[(Et 2 O)2 H] [Al(OC 6 F 5)4 ](3),[ Ph 3 C] [Ta(OC 6 F 5)6 ](4),(Et 2 O)Al OCH(C6 F 5)2 } 3(5),(Et 2 O)Al OC(CF 3)3 } 3(6),[Ph 3 C] [Al OC(CF 3)3 } 4 ](7) ,[Ph 3 C] [AlF OC(CF 3)3 } 3 ](8),[Ph 3 C] [(F 3 C)3 CO} 3 Al-F-Al OC(CF 3)3 } 3 ](9),[Ph 3 C] [CB 11 H 6 Br 6 ](10)。所获得的对
1-己烯和1-
辛烯的相对选择性显示出对助