A new yttrium(iii) complex with the pincer type bis(phosphinophenyl)amide ligand was synthesized and its activity and selectivity in the isoprene polymerization reaction was studied. An ultrahigh molecular weight polyisoprene with a > 99% content of 1,4-cis units was obtained.

中文翻译：

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异戊二烯聚合中钇（iii）钳形配合物的比较活性

合成了一种新型的带有钳型双(膦基苯基)酰胺配体的钇(iii)配合物，并研究了其在异戊二烯聚合反应中的活性和选择性。获得了 1,4-顺式单元含量 > 99% 的超高分子量聚异戊二烯。