32191-46-1Relevant academic research and scientific papers
Well-Defined, Versatile and Recyclable Half-Sandwich Nickelacarborane Catalyst for Selective Carbene-Transfer Reactions
Wang, Linghua,Perveen, Saima,Ouyang, Yizhao,Zhang, Shuai,Jiao, Jiao,He, Gang,Nie, Yong,Li, Pengfei
supporting information, p. 5754 - 5760 (2021/03/08)
Catalytic carbene-transfer reactions constitute a class of highly useful transformations in organic synthesis. Although catalysts based on a range of transition-metals have been reported, the readily accessible nickel(II)-based complexes have been rarely used. Herein, an air-stable nickel(II)-carborane complex is reported as a well-defined, versatile and recyclable catalyst for selective carbene transfer reactions with low catalyst loading under mild conditions. This catalyst is effective for several types of reactions including diastereoselective cyclopropanation, epoxidation, selective X?H insertions (X = C, N, O, S, Si), particularly for the unprotected substrates. This represents a rare example of carborane ligands in base metal catalysis.
Catalytic O-H bond insertion reactions using surface modified sewage sludge as a catalyst
Baell, Jonathan B.,He, Yide,Huang, Fei,Huang, He,Xu, Yao,Yi, Xiangyan,Yu, Yang,Zhang, Zhipeng
, p. 1594 - 1604 (2020/03/26)
Developing a greener, sustainable catalyst is a very important but challenging task in organic synthesis. Herein, for the first time, we choose more economical and greener surface modified sewage sludge-derived carbonaceous materials (SW) treated by perch
Photochemical O-H Functionalization of Aryldiazoacetates with Phenols via Proton Transfer
Empel, Claire,Jana, Sripati,Pei, Chao,Nguyen, Thanh Vinh,Koenigs, Rene M.
supporting information, p. 7225 - 7229 (2020/10/02)
In this work, we report a thorough investigation of the reaction of phenols with aryldiazoacetates. Mechanistic studies using different spectroscopic methods and theoretical calculations suggest a hydrogen bond between phenol and aryldiazoacetates, which can be modulated by the phenol acidity. The pKA of phenol and therefore the hydrogen bond plays an important role in a subsequent photoinduced proton transfer reaction to give the formal O-H functionalization product of phenols.
Application of sludge carbon catalyst with modified surface
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Paragraph 0086-0088, (2019/01/05)
The invention discloses application of a sludge carbon catalyst with a modified surface in reaction of inserting O-H into carbene and constructing a C-O bond. Alpha-diazonium ester and a phenolic compound serve as starting materials, modified sludge carbo
(C6F5)3B Catalyzed Chemoselective and ortho-Selective Substitution of Phenols with α-Aryl α-Diazoesters
Yu, Zhunzhun,Li, Yongfeng,Shi, Jiameng,Ma, Ben,Liu, Lu,Zhang, Junliang
, p. 14807 - 14811 (2016/11/23)
The development of an efficient method for the site-selective substitution of unprotected phenols has long been considered as an attractive but challenging task. Herein, we describe a highly chemo- and ortho-selective substitution reaction of phenols with α-aryl α-diazoacetates with commercially available (C6F5)3B as the catalyst. This reaction proceeds under simple and mild conditions with high efficiency, it features a wide substrate scope and can be easily scaled up.
Origins of unique gold-catalysed chemo- and site-selective C-H functionalization of phenols with diazo compounds
Liu, Yuan,Yu, Zhunzhun,Zhang, John Zenghui,Liu, Lu,Xia, Fei,Zhang, Junliang
, p. 1988 - 1995 (2016/03/05)
In past decade, gold revealed more and more unique properties in carbene chemistry. It was disclosed in our recent communication (J. Am. Chem. Soc. 2014, 136, 6904) that gold carbenes have unprecedented chemo- and site-selectivity and ligand effect toward
Highly site-selective direct C-H bond functionalization of phenols with α-aryl-α-diazoacetates and diazooxindoles via gold catalysis
Yu, Zhunzhun,Ma, Ben,Chen, Mingjin,Wu, Hai-Hong,Liu, Lu,Zhang, Junliang
supporting information, p. 6904 - 6907 (2014/06/09)
An unprecedented direct C-H bond functionalization of unprotected phenols with α-aryl α-diazoacetates and diazooxindoles was developed. A tris(2,4-di-tert-butylphenyl) phosphite derived gold complex promoted the highly chemoselective and site-selective C-H bond functionalization of phenols and N-acylanilines with gold-carbene generated from the decomposition of diazo compounds, furnishing the corresponding products in moderate to excellent yields at rt. The salient features of this reaction include readily available starting materials, unprecedented C-H functionalization rather than X-H insertion, good substrate scope, mild conditions, high efficiency, and ease in further transformation. To the best of our knowledge, this is the first example of C-H functionalization of unprotected phenols with diazo compounds.
Design of reaction media for nucleophilic substitution reactions by using a catalytic amount of an amphiphilic imidazolium salt in water
Asano, Keisuke,Matsubara, Seijiro
experimental part, p. 989 - 1002 (2010/10/19)
Molecules of an amphiphilic imidazolium salt assemble in water to form a hydrophobic membrane including an interface consisting of ammonium species. Such an interface works as a reaction medium like an ionic liquid. We used the medium for nucleophilic substitution reactions between alkyl halides and anionic nucleophiles. This procedure allowed the reactions to proceed efficiently in water without any organic solvent.
