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首页> 外文期刊>Chemistry: A European journal >Ethene/Norbornene Copolymerization with Palladium(II) alpha-Diimine Catalysts: From Ligand Screeing to Discrete Catalyst Species
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Ethene/Norbornene Copolymerization with Palladium(II) alpha-Diimine Catalysts: From Ligand Screeing to Discrete Catalyst Species

机译：乙烯/降冰片烯与钯（II）α-二胺催化剂的共聚合：从配体刮擦到离散的催化剂种类

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摘要

Sixteen palladium(II) alpha-diimine catalysts were investigated in a screening-like procedure for the copolymerization of ethene with norbornene. The resulting copolymers were characterized by ~13C NMR spectroscopy, differential scanning calorimetry, gel permeation chromatography, and viscosimetry. The degree of incorporation of norbornene in the polymer chain is very high for most of the calalysts. To validate the results achieved in the scrrening, two catalysts, [{ArN=CHCH=NAr}Pd(Me)-(CH_3CN)]BAr_4~f(1b'; Ar=2,6-Me_2C_6H_3, BAr_4~f=b[3,5-(C_6H_3(CH_3)_2]_4} [{ArN=C(CH_3)C(CH_3)=NAr}Pd(Me)-(CH_3CN)]BAr_4~F (2C'; Ar=2,6-iPr_2C_6H_3), were synthesized as discrete catalytically active specids, and their copolymerization behavior was investigated in detail. In agreement with the screening results 1b' incorporates norbornene much better in the polymer chain than ethene, a property that has no analogue in metal-locene catalysts.
机译：以类似筛选的程序研究了十六种钯（II）α-二亚胺催化剂，用于乙烯与降冰片烯的共聚。通过〜13 C NMR光谱，差示扫描量热法，凝胶渗透色谱法和粘度测定法对所得共聚物进行表征。对于大多数催化剂，降冰片烯在聚合物链中的掺入度非常高。为了验证在粗磨中获得的结果，使用两种催化剂[{ArN = CHCH = NAr} Pd（Me）-（CH_3CN）] BAr_4〜f（1b'; Ar = 2,6-Me_2C_6H_3，BAr_4〜f = b [ 3,5-（C_6H_3（CH_3）_2] _4} [{ArN = C（CH_3）C（CH_3）= NAr} Pd（Me）-（CH_3CN）] BAr_4〜F（2C'; Ar = 2,6-合成了iPr_2C_6H_3作为离散的催化活性物种，并对它们的共聚行为进行了详细的研究，与筛选结果相符，1b'在聚合物链中的降冰片烯的掺混性能比乙烯好，在金属-茂金属催化剂中没有类似物。

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