Hetero-dicarbene Complexes of Palladium(II): Syntheses and Catalytic Activities
Hetero-dicarbene Complexes of Palladium(II): Syntheses and Catalytic Activities
复制标题
钯(II)杂二碳烯配合物：合成和催化活性
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Huynh
中科院分区：
文献类型：
--
作者：
D. Yuan;H. Huynh
合成了一系列含顺式螯合杂二卡宾的二溴化钯配合物2-6，它们含有两种不同类型的由丙烯链连接的NHC。在大多数情况下，N-甲基苯并咪唑啉-2-亚基部分被保留为一个NHC供体，而另一个随着不同的杂环主链而变化。作为例外，配合物8中的杂-diNHC通过组合1，2，4-三唑和吲唑前体而衍生。通过将上述溴代配合物与AgO_2CCF_3或AgOTf在CH_3CN中反应，合成了携带更不稳定的CF_3CO_2-或CH_3CN配体的类似配合物9-17。对9-17在五氟苯与4-氯溴苯直接芳基化反应中的催化活性进行了系统的比较，发现含有更大体积和更少给电子配体的配合物具有更高的活性。配合物12，携带mesitylimidazolin-2-ylidene单元，被证明是最有效的，其活性也进行了测试，在直接芳基化的四氟苯。
A series of Pd(II) dibromido complexes 2–6 bearing cis-chelating hetero-dicarbenes, which contain two different types of NHCs linked by a propylene chain, have been synthesized. In most cases, the N-methylbenzimidazolin-2-ylidene moiety was kept as one NHC donor, while the other one varies with different heterocyclic backbones. As an exception, the hetero-diNHC in complex 8 is derived by combining 1,2,4-triazole and indazole precursors instead. Analogous complexes 9–17, carrying more labile CF3CO2 – or CH3CN ligands, were synthesized by reacting the aforementioned bromido complexes with AgO2CCF3 or AgOTf in CH3CN. A systematic catalytic comparison of 9–17 in the direct arylation of pentafluorobenzene with 4-chlorobromobenzene was carried out, and complexes that contain bulkier and less electron-donating ligands were found to be more active. Complex 12, carrying the mesitylimidazolin-2-ylidene unit, proved to be the most efficient, and its activity was also tested in the direct arylation of tetrafluorobenz...
影响因子：
2.8
作者：
Martin D;Melaimi M;Soleilhavoup M;Bertrand G
通讯作者：
Bertrand G
影响因子：
15
作者：
Do, Hien-Ouang;Khan, Rana M. Kashif;Daugulis, Olafs
通讯作者：
Daugulis, Olafs
影响因子：
15
作者：
Do, Hien-Quang;Daugulis, Olafs
通讯作者：
Daugulis, Olafs