Capping Arene Ligated Rhodium-Catalyzed Olefin Hydrogenation: A Model Study of the Ligand Influence on a Catalytic Process That Incorporates Oxidative Addition and Reductive Elimination

Capping Arene Ligated Rhodium-Catalyzed Olefin Hydrogenation: A Model Study of the Ligand Influence on a Catalytic Process That Incorporates Oxidative Addition and Reductive Elimination
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封端芳烃连接铑催化烯烃氢化:配体对氧化加成和还原消除催化过程影响的模型研究

DOI:
10.1021/acs.organomet.2c00317
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发表时间:
2022
期刊:
影响因子:
2.8
通讯作者:
Gunnoe, T. Brent
Gunnoe, T. Brent
中科院分区:
化学2区
文献类型:
--
作者:
Zhang, Ke;Musgrave, Charles B.;Dickie, Diane A.;Goddard, William A.;Gunnoe, T. Brent

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研究了6-FP(8,8‘-(1,2-亚苯基)二喹啉)、6-η(8,8’-(2,3-萘)联喹啉)、5-FP(1,2-二(N-7-氮杂环丁基)苯)和5-NPFP[2,3-双(N-7-氮杂环丁基)萘]等四种封端芳烃催化剂前驱体(FP)Rh(C2H4)Cl{FP=封端芳烃配体对烯烃加氢反应的影响。研究表明,催化烯烃加氢的相对速率遵循(6-FP)Rh(η2-C2H4)Cl≫(5-FP)Rh(η2-C2H4)Cl的趋势。结合实验和密度泛函理论模拟研究,我们认为(6-FP)Rh(η2-C2H4)Cl和(5-FP)Rh(η2-C2H4)Cl催化的烯烃加氢反应速率的差异很可能归因于二氢氧化加成反应活化能的不同。用(6-NPFP)Rh(η2-C2H4)Cl和(5-NPFP)Rh(η2-C2H4)Cl作为催化剂前驱体,由于(5-NPFP)Rh(η2-C2H4)Cl能较快地形成不配位5-NPFP的活性催化剂,因此不能直接比较烯烃加氢反应的速率。
The ligand influence on olefin hydrogenation using four capping arene ligated Rh(I) catalyst precursors (FP)Rh(η2-C2H4)Cl {FP = capping arene ligands, including 6-FP (8,8′-(1,2-phenylene)diquinoline), 6-NPFP (8,8′-(2,3-naphthalene)diquinoline), 5-FP (1,2-bis(N-7-azaindolyl)benzene) and 5-NPFP [2,3-bis(N-7-azaindolyl)naphthalene]} has been studied. Our studies indicate that relative observed rates of catalytic olefin hydrogenation follow the trend (6-FP)Rh(η2-C2H4)Cl > (5-FP)Rh(η2-C2H4)Cl. Based on combined experimental and density functional theory modeling studies, we propose that the observed differences in the rate of (6-FP)Rh(η2-C2H4)Cl and (5-FP)Rh(η2-C2H4)Cl-catalyzed olefin hydrogenation are most likely attributed to the difference in the activation energies for the dihydrogen oxidative addition step. We are unable to directly compare the rates of olefin hydrogenation using (6-NPFP)Rh(η2-C2H4)Cl and (5-NPFP)Rh(η2-C2H4)Cl as the catalyst precursor since (5-NPFP)Rh(η2-C2H4)Cl undergoes relatively rapid formation of an active catalyst that does not coordinate 5-NPFP.
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