The Initiation Reaction of Hoveyda–Grubbs Complexes with Ethene

The Initiation Reaction of Hoveyda–Grubbs Complexes with Ethene
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HoveydaâGrubbs 配合物与乙烯的引发反应

DOI:
10.1021/acscatal.8b03445
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发表时间:
2019
期刊:
影响因子:
12.9
通讯作者:
H. Plenio
H. Plenio
中科院分区:
化学1区
文献类型:
--
作者:
N. Peschek;K.-J. Wannowius;H. Plenio

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用紫外-可见光谱研究了三种Hoveyda-Grubbs配合物GH(H)、GH(4-NO2)和GH(5-NO2)与乙烯的引发反应。缺电子配合物GH(4-NO2)和GH(5-NO2)对乙烯的引发速率分别是对1-己烯的1.2倍和1.7倍。详细的多波长分析的吸光度-时间的痕迹揭示了多步骤的性质的反应的Hoveyda-Grubbs配合物与乙烯。除了已确定的速率常数k1(在乙烯中为一级反应)外,还确定了另外两个与烯烃无关的反应k2和k3:k2取决于GH预催化剂的性质,而k3几乎与预催化剂无关。与k1相关的反应先于fasterk 2,导致从各自的Hoveyda-Grubbs络合物和乙烯形成的中间体的低静止浓度,对应于postinitiation物种。
The initiation reactions of the three Hoveyda–Grubbs complexes (GH(H),GH(4-NO2), andGH(5-NO2)) with ethene were studied via UV–vis spectroscopy. The unsubstituted complexGH(H)initiates approximately 5 times slower with ethene than with 1-hexene, and the electron-deficientGH(4-NO2)andGH(5-NO2)initiates 1.2 and 1.7 times slower with ethene than with 1-hexene. A detailed multiwavelength analysis of the absorbance–time traces reveals the multistep nature of the reaction of the Hoveyda–Grubbs complexes with ethene. In addition to the established rate constantk1(being first order in ethene), two additional,c(olefin) independent reactionsk2andk3were identified:k2depends on the nature of the GH precatalyst, whilek3is nearly independent of the precatalyst. The reaction associated withk1precedes the fasterk2leading to low stationary concentration of an intermediate formed from the respective Hoveyda–Grubbs complex and ethene, corresponding to a postinitiation species.
DOI: 10.1021/ja907805f
发表时间: 2009-11-18
影响因子: 15
作者:
Meek, Simon J.;Malcolmson, Steven J.;Li, Bo;Schrock, Richard R.;Hoveyda, Amir H.
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发表时间: 2018-05-01
期刊: ACS CATALYSIS
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