Control of Stereochemistry in Cyclopolymerization of Dienes Using New Symmetrical Palladium Catalyst

我们使用具有非对称或低对称结构的钯催化剂聚合烯烃、二烯和三烯。这些配合物促进了末端二烯和双末端三烯的环聚合，并在聚合物上生成了具有环状结构的聚合物。聚合的立体化学反应受催化剂结构的影响，低对称结构的催化剂也提供了调控聚合物。我们研究了由大环配体支撑的二钯配合物的合成及其作为几种单体聚合的用途。虽然配合物不能很好地催化二烯的环聚合，但烯烃的聚合和烯烃与极性单体的共聚产生了新的聚合物合成反应。共聚得到了具有高杨氏模量的弹性体高分子材料。

We used the palladium catalyst having non- or low-symmetrical structures for polymerization of olefins, dienes, and trienes. Cyclopolymerization of terminal dienes and bis-terminal trienes were promoted by the complexes and yielded the polymers having cyclic structures along the polymers in a regulated form. The stereochemistry of the polymerization is influenced by the structures of the catalysts, and low-symmetrical structure catalyst also provided the regulated polymers. We examined synthesis of the dipalladium complexes supported by a macrocyclic ligand and their use as the polymerization of several monomers. Although the cyclopolymerization of diene was not well catalyzed by the complexes, polymerization of olefins and copolymerization of olefins with polar monomers resulted in new polymer synthetic reactions. The copolymerization afforded elastomeric polymer materials with high Young's modulus.