Analogies and Differences in Palladium-Catalyzed CO/Styrene and Ethylene/Methyl Acrylate Copolymerization Reactions

被引:26
作者
Rosar, Vera [1 ]
Meduri, Angelo [2 ]
Montini, Tiziano [1 ]
Fini, Francesco [3 ]
Carfagna, Carla [3 ]
Fornasiero, Paolo [1 ]
Balducci, Gabriele [1 ]
Zangrando, Ennio [1 ]
Milani, Barbara [1 ]
机构
[1] Univ Trieste, Dept Chem & Pharmaceut Sci, I-34127 Trieste, Italy
[2] Univ Salerno, Dept Biol & Chem, I-84084 Fisciano, SA, Italy
[3] Univ Urbino, Dept Biomol Sci, I-61029 Urbino, Italy
关键词
alkenes; copolymerization; N ligands; palladium; homogeneous catalysis; POLAR VINYL MONOMERS; COORDINATION-INSERTION COPOLYMERIZATION; BIDENTATE NITROGEN LIGANDS; CARBON-MONOXIDE; ALTERNATING COPOLYMERIZATION; MECHANISTIC INSIGHTS; PD(II) CATALYSTS; FUNCTIONAL POLYOLEFINS; BRANCHED POLYETHYLENE; METAL CATALYSTS;
D O I
10.1002/cctc.201402192
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The catalytic CO/styrene and ethylene/methyl acrylate copolymerizations are compared for the first time by applying the same precatalysts. With this aim, Pd-II neutral, [Pd(CH3) Cl(N-N)], and monocationic, [Pd(CH3)(L)(N-N)][PF6] (L= CH3CN, DMSO), complexes with 1-naphthyl- and 2-naphthyl-substitued alpha-diimines with both an acenaphthene and a diazabutadiene skeleton as chelating nitrogen-donor ligands (N-N) have been studied. In the case of the complexes with the 1-naphthyl-substituted ligands, syn and anti isomers are found both in solid state and in solution. All the monocationic complexes generate active catalysts for the CO/styrene copolymerization leading to atactic or isotactic/atactic stereoblock copolymers depending on the ligand bonded to palladium. Instead, in the case of the ethylene/methyl acrylate copolymerization only the complexes with the 1-naphthyl-substituted ligands generate catalysts for this reaction.
引用
收藏
页码:2403 / 2418
页数:16
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