A thermal stable α-diimine palladium catalyst for copolymerization of ethylene with functionalized olefins
摘要:
Copolymerization of polar monomers and olefins catalyzed by transition metal under mild conditions is a challenge. alpha-Diimine palladium complexes have great potential to catalyze the copolymerization of alkylacrylates and olefins. But they are prone to deactivation under mild conditions which limits their industrial application. A novel unsymmetrical alpha-diimine palladium complex with bulkier alpha-diimine ligand was provided in this paper. They were active in ethylene homopolymerization at 80 degrees C. At 50 degrees C they could produce ethylene/methylacrylate copolymer with moderate methylacrylate incorporation. The probable reason for the high thermal stability of these complexes was proposed. (C) 2014 Elsevier B.V. All rights reserved.
Palladium-Catalyzed Intramolecular C-H Amination in Water
作者:Lizheng Yang、Hao Li、Haifei Zhang、Hongjian Lu
DOI:10.1002/ejoc.201601043
日期:2016.12
found to be effective for intramolecular C–H amination in water. With 2-azidobiphenyls as substrates, the reaction efficiently provided various carbazoles with N2 as the sole byproduct. The reaction showed high functional-group tolerance and could be used in the synthesis of several natural carbazole alkaloids. The catalytic process was promoted by water, and the reaction was inefficient in the organic
发现钯 (II) 催化对水中的分子内 C-H 胺化有效。以 2-叠氮联苯为底物,该反应有效地提供了各种咔唑,N2 作为唯一的副产物。该反应显示出高官能团耐受性,可用于合成多种天然咔唑生物碱。催化过程受水促进,在所研究的有机溶剂中反应效率低下。
General and highly active catalyst for mono and double Hiyama coupling reactions of unreactive aryl chlorides in water
作者:Dong-Hwan Lee、Ji-Young Jung、Myung-Jong Jin
DOI:10.1039/c0cc03535a
日期:——
A new beta-diketiminatophosphane Pd catalyst was found to be highly effective in the mono and double Hiyama couplingreactions of unactivated arylchlorides in water.
Visible-light-promoted intramolecular C–H amination in aqueous solution: synthesis of carbazoles
作者:Lizheng Yang、Yipin Zhang、Xiaodong Zou、Hongjian Lu、Guigen Li
DOI:10.1039/c7gc03392c
日期:——
An effective and operationally simpleprotocol is reported for the synthesis of versatile carbazoles. With water as a co-solvent, visible-light rather than various metals is used to facilitate the conversion of readily available 2-azidobiphenyls under mild conditions. Various functionalized bioactive natural alkaloids, such as glycoborine, clausine C, clausine L, clausine H and clauszoline K, were
Facile synthesis of mono-, bis- and tris-aryl-substituted aniline derivatives in aqueous DMF
作者:Chun Liu、Xiaoxiao Song、Qijian Ni、Jieshan Qiu
DOI:10.3998/ark.5550190.0013.906
日期:——
A facile, efficient and general protocol for synthesizing a series of mono-, bisand tris-arylsubstituted anilinederivatives is described via the Pd(OAc)2-catalyzed aerobic and ligand-free Suzuki reaction of mono-, diand tribromoanilines with aryl boronic acids in aqueous N,Ndimethylformamide (DMF). This is the first example to prepare 2,6-bisaryl-4-nitroanilines and 2,6-bisarylanilines via a palladium-catalyzed
An Extremely Active and General Catalyst for Suzuki Coupling Reaction of Unreactive Aryl Chlorides
作者:Dong-Hwan Lee、Myung-Jong Jin
DOI:10.1021/ol102677r
日期:2011.1.21
2a acted as a powerful catalyst which allows easy access to the Suzukicouplingreaction of less reactive arylchlorides under mild conditions. A wide range of sterically hindered and deactivated arylchlorides could be efficiently coupled at a low catalyst loading of 0.1 mol %. Furthermore, this catalytic system also proved to be highly effective in one-pot multiple couplings.