1694-20-8Relevant academic research and scientific papers
Cis/trans conversion of potassium derivatives of 2- and 4-nitrostilbenes
Todres, Zori V.
, p. 349 - 354 (1992)
Potassium derivatives of 2- and 4-nitrostilbenes exist in non-dissociating solvents as coordination complexes with localization of the metal at the nitro group.Stilbene components of the complexes undergo cis/trans conversion, the extent of which does not
Catalytic applications of 1,2,4-diazaphospholide-based ruthenium complexes in the Heck reaction
Yorke, Jake,Wan, Li,Xia, Aibing,Zheng, Wenjun
, p. 8843 - 8845 (2007)
The palladium-catalyzed Heck reaction was effected with two ruthenium complexes bearing unique heterocyclic 1,2,4-diazaphospholide ligands that contain sp2-hybridized phosphorus atoms.
A new recyclable Pd catalyst supported on vertically aligned carbon nanotubes for microwaves-assisted Heck reactions
Janowska, Izabela,Chizari, Kambiz,Olivier, Jean-Hubert,Ziessel, Raymond,Ledoux, Marc Jacques,Pham-Huu, Cuong
, p. 663 - 670 (2011)
Palladium supported on vertically aligned multi-walled carbon nanotubes (Pd/VA-CNTs) is used as catalyst for the C-C coupling reactions of p-iodonitrobenzene with styrene and ethyl acrylate under microwaves irradiation. Pd/VA-CNTs catalyst exhibits higher
Mild and rational synthesis of palladium complexes comprising C(4)-bound N-heterocyclic carbenes
Kluser, Evelyne,Neels, Antonia,Albrecht, Martin
, p. 4495 - 4497 (2006)
Oxidative addition of pyridyl-functionalised 4-iodoimidazolium salts to palladium(0) gives catalytically active complexes in which the N-heterocyclic carbene is bound to the palladium(ii) centre in a non-classical bonding mode via C(4). The Royal Society of Chemistry 2006.
Oxazoline Chemistry. Part 11: Syntheses of natural and synthetic isoflavones, stilbenes and related species via C-C bond formation promoted by a Pd-oxazoline complex
Eisnor, Charles R.,Gossage, Robert A.,Yadav, Paras N.
, p. 3395 - 3401 (2006)
The complex trans-[PdCl2(2-ethyl-2-oxazoline- κ1N)2] (1) is shown to be an active and oxidatively robust catalyst for C-C bond forming reactions (Heck, Sonogashira, Ullmann, Miyaura-Suzuki, etc.). These reactions can be carried out in air without rigorous solvent/substrate purification and in the absence of additional free ligand. The general methodology described above has been applied to the high yield and regio-selective formation, via Miyaura-Suzuki coupling, of natural and synthetic isoflavones (i.e., isoflavone, 2′-methylisoflavone [7b], 3′-methylisoflavone [7c] and 3′,4′-benzoisoflavone: [7d]). Compounds 7c and 7d are previously unknown. In addition, the synthesis of (E)-tris-O-methylresveratrol and (E)-3,5-dimethoxystilbene is also described; the former is a recognized anti-cancer agent while the latter is a biologically active extract from the bark of the conifer species Pinus armandii. Both of these latter products are produced as a result of a Heck coupling reaction promoted by 1.
Application of an air stable Pd oxazoline complex for Heck, Suzuki, Sonogashira and related C-C bond-forming reactions
Gossage, Robert A.,Jenkins, Hilary A.,Yadav, Paras N.
, p. 7689 - 7691 (2004)
The novel complex trans-[PdCl2(η1-N-2-ethyl-2- oxazoline)2] is shown to be an active and oxidatively robust catalyst for C-C bond-forming reactions (Heck, Sonogashira, Ullman, Suzuki), which can be carried out in air witho
The effects of 4′-alkyl substituents on the mutagenic activity of 4-amino- and 4-nitrostilbenes in Salmonella typhimurium
Ludolph, Bj?rn,Klein, Markus,Erdinger, Lothar,Boche, Gernot
, p. 195 - 209 (2001)
Six derivatives of trans-4-aminostilbene bearing different alkyl groups in the 4′-position and six of the corresponding nitro compounds were synthesized and tested for their mutagenic potency in Salmonella typhimurium strains TA98 and TA100. Regarding the test series in presence of S9-mix, maximum activity was observed for those trans-4-aminostilbenes and trans-4-nitrostilbenes bearing small alkyl substituents like methyl and ethyl. More bulky substituents reduced the mutagenic potential in the order iso-propyl ethyl > iso-propyl > sec-butyl > tert-butyl). These trends have been compared with quantitative structure activity relationship (QSAR) model predictions, leading to the conclusion that steric demand is an important factor for mutagenicity of substituted aminostilbenes and nitrostilbenes. The unexpected result for the tert-butyl nitrostilbene tested with metabolic activation may be attributed to a different metabolic pathway.
Enhanced Heck reaction on flower-like Co(Mg or Ni)Al layered double hydroxide supported ultrafine PdCo alloy nanocluster catalysts: The promotional effect of Co
Li, Jin,Song, Ying,Wang, Yajuan,Zhang, Hui
, p. 17741 - 17751 (2019)
A series of PdCo alloy nanocluster (NC) catalysts x-PdCor/Co(Mg or Ni)Al-LDH (x: Pd loading, r: Co/Pd molar ratio) were synthesized by immobilizing ultrafine PdCor-PVP NCs on flower-like layered double hydroxide (LDH) supports. The s
Heterogeneous heck catalysis with palladium-grafted molecular sieves
Mehnert, Christian P.,Weaver, David W.,Ying, Jackie Y.
, p. 12289 - 12296 (1998)
The synthesis and characterization of palladium-grafted mesoporous MCM- 41 material, designated Pd-TMS11, are described. The material is investigated for carbon-carbon coupling reactions (Heck catalysis) with activated and nonactivated aryl substrates. Fo
Valorisation of urban waste to access low-cost heterogeneous palladium catalysts for cross-coupling reactions in biomass-derived γ-valerolactone
Valentini, Federica,Ferlin, Francesco,Lilli, Simone,Marrocchi, Assunta,Ping, Liu,Gu, Yanlong,Vaccaro, Luigi
supporting information, p. 5887 - 5895 (2021/08/23)
Herein we report a simple protocol for the valorisation of a common urban biowaste. The lignocellulosic biomass obtained after the pre-treatment of pine needle urban waste is efficiently transformed into a low-cost support (PiNe) for the immobilization of Pd nanoparticles. The final Pd/PiNe heterogeneous catalyst features a small particle size (4.5 nm) and a metal loading (9.9 wt%) comparable with most commercially available and generally used counterparts. In this contribution, we tested the catalytic efficiency of the Pd/PiNe system in two representative cross-couplings, Heck and Hiyama reactions, and compared the results obtained with commercial Pd/C catalyst. The good reactivity in the biomass-derived solvent (GVL) confirms that the Pd/PiNe heterogeneous catalyst is a valid system that can be integrated into a waste valorization chain within a circular economy approach. In addition, the efficiency of the catalyst has also been extended to perform the challenging consecutive Hiyama-Heck reaction to afford differently substituted (E)-1,2-diarylethenes.
