97355-53-8Relevant articles and documents
Air-stable μ2-hydroxyl bridged cationic binuclear complexes of zirconocene perfluorooctanesulfonates: their structures, characterization and application
Zhang, Xiaohong,Xu, Xinhua,Li, Ningbo,Liang, Zhiwu,Tang, Zilong
supporting information, p. 1926 - 1932 (2018/03/21)
Three air-stable zirconocene perfluoro-octanesulfonates were successfully synthesized by treatment of C8F17SO3Ag with (RCp)2ZrCl2 [R = H, n-Bu, t-Bu]. According to X-ray analysis, they have μ2-hydroxyl bridged cationic binuclear structures: (i) [CpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·2THF·4H2O (1a·2THF·4H2O), (ii) [n-BuCpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·6H2O (2a·6H2O), and (iii) [t-BuCpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·2C3H6O·8H2O (3a·2C3H6O·8H2O). The ligands of water and organic molecules in the complexes originated from the moist air and solvent during their recrystallization. These complexes were characterized with different techniques, and found to show water tolerance, air/thermal stability as well as strong Lewis acidity. Moreover, the complexes showed highly catalytic activity in various reactions of C–C bond formation. With good recyclability, they should find wide applications in organic chemistry.
Supported iron catalysts for Michael addition reactions
Ye, Rong,Faucher, Franco F.,Somorjai, Gabor A.
, p. 65 - 71 (2018/02/13)
Heterogeneous catalysts have been widely used for chemical transformations and offer easy product separation in addition to their high activity. Iron is an earth-abundant metal, but it has not been studied thoroughly as heterogeneous catalysts for organic
Sulfonic acid-functionalized magnetic nanoparticles as a recyclable and eco-friendly catalyst for atom economical Michael addition reactions and bis indolyl methane synthesis
Mahmoudi, Hajar,Jafari, Abbas Ali,Saeedi, Soroosh,Firouzabadi, Habib
, p. 3023 - 3030 (2015/02/05)
A modified sulfonic acid functionalized magnetic nanoparticle composite (Fe3O4@γFe2O3-SO3H) is prepared by the use of ultrasonic irradiation. By this modification, the size of the nano-particles was r
From waste biomass to solid support: Lignosulfonate as a cost- Effective and renewable supporting material for catalysis
Sun, Shaohuan,Bai, Rongxian,Gu, Yanlong
supporting information, p. 549 - 558 (2014/04/03)
Lignosulfonate (LS) is an organic waste generated as a byproduct of the cooking process in sulfite pulping in the manufacture of paper. In this paper, LS was used as an anionic supporting material for immobilizing cationic species, which can then be used as heterogeneous catalysts in some organic transformations. With this strategy, three lignin-supported catalysts were prepared including 1) lignin- SO3Sc(OTf)2, 2) lignin-SO3Cu(OTf), and 3) lignin-IL@NH2 (IL= ionic liquid). These solid materials were then examined in many organic transformations. It was finally found that, compared with its homogeneous counterpart as well as some other solid catalysts that are prepared by using different supports with the same metal or catalytically active species, the lignin-supported catalysts showed better performance in these reactions not only in terms of activity but also with regard to recyclability.
Gluconic acid aqueous solution as a sustainable and recyclable promoting medium for organic reactions
Zhou, Binghua,Yang, Jie,Li, Minghao,Gu, Yanlong
supporting information; experimental part, p. 2204 - 2211 (2011/10/03)
For the first time, gluconic acid aqueous solution (GAAS), a biobased weakly acidic liquid, was used as an effective promoting medium for organic reactions, such as the Michael addition of indoles to α,β-unsaturated ketones, the electrophilic ring-opening
Sulfamic acid as a cost-effective and recyclable solid acid catalyst for Friedel-Crafts alkylation of indole with α,β-unsaturated carbonyl compound and benzyl alcohol
Yang, Jing,Zhang, Juan,Chen, Tian Tian,Sun, De Mei,Li, Ji,Wu, Xue Fen
experimental part, p. 1391 - 1394 (2012/06/01)
Sulfamic acid was proved to be a cost-effective and recyclable catalyst for Friedel-Crafts type reaction of indole with α,β-unsaturated carbonyl compound and benzyl alcohol. Various indoles, α,β-unsaturated carbonyl compounds and a benzyl alcohol were suc
Zirconium tetrakis(dodecylsulfate) as an efficient and recyclable lewis acid-surfactant-combined catalyzed C-C and C-N bond forming under mild and environmentally benign conditions
Jafarpour, Maasoumeh,Rezaeifard, Abdolreza,Aliabadi, Marzieh
scheme or table, p. 94 - 99 (2010/04/23)
A green catalytic method for C-C and C-N bond forming via Michael addition of aromatic amines and indoles to electron-deficient olefins using Zirconium tetrakis(dodecylsulfate) in water under mild conditions with high yields and selectivity has been developed. The reusability of the catalyst has been successfully examined without any noticeable loss of its catalytic activity.
Antimony(III) sulfate catalyzed condensation reaction of indoles with carbonyl compounds
Srinivasa, Aswathanarayana,Varma, Putta Prabhakar,Hulikal, Vijaykumar,Mahadevan, Kittappa M.
, p. 111 - 115 (2008/09/21)
Antimony sulfate was found to be on effective catalyst for the condensation reaction of indoles with carbonyl compounds at room temperature. This catalyst is inexpensive, easily available and it was also found that this catalyst could be recovered quantitatively and reused without much loss of catalytic activity.
Synthesis of 3-substituted indoles promoted by pulverization-activation method catalyzed by Bi(NO3)3·5H2O
Khodaei, Mohammad M.,Mohammadpoor-Baltork, Iraj,Memarian, Hamid R.,Khosropour, Ahmad R.,Nikoofar, Kobra,Ghanbary, Parvin
, p. 377 - 381 (2008/09/20)
(Chemical Equation Presented) A new, facile, efficient, "green" and chemoselective procedure for the synthesis of indole derivatives has been developed with pulverization-activation method catalyzed by Bi(NO 3)3·5H2O (PAMC- Bi(NO3) 3·5H2O) through grinding of indoles with aldehydes or Michael acceptors in the presence of catalytic amounts of Bi(NO 3)3·5H2O under solvent-free conditions.
Triflic acid-catalyzed Michael reactions of indole and pyrrole compounds with α,β-unsaturated ketones in water
Zhang, Hai-Bo,Liu, Li,Liu, Yu-Liang,Chen, Yong-Jun,Wang, Jun,Wang, Dong
, p. 173 - 181 (2007/10/03)
The Michael reactions of indole and pyrrole compounds to α,β-unsaturated ketones catalyzed by triflic acid (HOTf, 0.1-1 mol%) were performed in water to give alkylated indoles (3a-m) and dialkylsubstituted pyrroles (6a-b) in good to excellent yields. Copy