Copolymerization of Propylene and Polar Monomers Using Pd/IzQO Catalysts
Copolymerization of Propylene and Polar Monomers Using Pd/IzQO Catalysts
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DOI：
10.1021/jacs.5b06948
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发表时间：
2015-09-02
影响因子：
15
通讯作者：
Nozaki, Kyoko
中科院分区：
文献类型：
--
作者：
Nakano, Ryo;Nozaki, Kyoko
钯催化剂携带咪唑[1,5-a]喹啉-9-油酸-1-酰基（IzQO）配体聚合α -烯烃，同时加入极性单体。n -杂环羰基（NHC）提供的空间环境使α -烯烃和极性单体能够在区域选择性插入，生成聚丙烯、丙烯/羧酸丙烯酯共聚物和丙烯/丙烯酸甲酯共聚物。已知的含有nhc基配体的聚合催化剂分解迅速，而目前的催化剂由于结构限制而耐用，其中nhc平面与金属方平面共面。目前的催化剂体系可以方便地获得一类新的功能化聚烯烃，并有助于构思一个新的基本原则来设计基于nhc的配体。
Palladium catalysts bearing imidazo[1,5-a]quinolin-9-olate-1-ylidene (IzQO) ligands polymerize alpha-olefins while incorporating polar monomers. The steric environment provided by N-heterocyclic-carbene (NHC) enables regioselective insertion of alpha-olefins and polar monomers, yielding polypropylene, propylene/allyl carboxylate copolymers, and propylene/methyl acrylate copolymer. Known polymerization catalysts bearing NHC-based ligands decompose rapidly, whereas the present catalyst is durable because of structural confinement, wherein the NHC-plane is coplanar to the metal square plane. The present catalyst system enables facile access to a new class of functionalized polyolefins and helps conceive a new fundamental principle for designing NHC-based ligands.