4192-77-2Relevant articles and documents
Heterogenization of (η5-C5Me5) Ru(PPh3)2Cl and its catalytic application for cyclopropanation of styrene using ethyl diazoacetate
Sakthivel, Ayyamperumal,Pedro, Filipe E.,Chiang, Anthony S. T.,Kuehn, Fritz E.
, p. 1682 - 1688 (2006)
(η5-C5Me5)Ru(PPh3) 2Cl (1) is heterogenized on the surface of mesoporous molecular sieves by direct grafting on mesoporous aluminosilicates or by reaction of an aminosilane-linker-modified silicate surface with the chloride ligand. Elemental analyses reveal that the grafted samples contain 0.2-1.8 wt% Ru. The retaining of long-range ordering of mesoporous MCM-41 and MCM-48 after grafting is evidenced from XRD, N2 adsorption-desorption and TEM analysis. FT-IR, TG-MS, 29Si and 1H CP MAS-NMR spectra confirm the successful grafting of complex 1 on the surface of these mesoporous materials. Mesoporous materials grafted with complex 1 are found to be promising catalysts for the cyclopropanation of styrene with ethyl diazoacetate. Georg Thieme Verlag Stuttgart.
Practical preparation method of polymer-incarcerated (PI) palladium catalysts using Pd(II) salts
Hagio, Hiroyuki,Sugiura, Masaharu,Kobayashi, Shu
, p. 375 - 378 (2006)
Polymer-incarcerated (PI) palladium catalyst was practically prepared from inexpensive Pd(II) salts and a polystyrene-based copolymer under reducing conditions. Remarkable effects of alkali metal salts on the palladium loading were observed. PI Pd thus prepared showed high catalytic activity in Mizoroki-Heck reactions and Suzuki-Miyaura couplings with a range of substrates including an aryl chloride. In all cases, the Pd catalyst was recovered quantitatively without leaching, and reused several times without significant loss of activity.
Improved cross-metathesis of acrylate esters catalyzed by 2nd generation ruthenium carbene complexes
Forman, Grant S.,Tooze, Robert P.
, p. 5863 - 5866 (2005)
The performance of cross-metathesis reactions between acrylate esters and olefins catalyzed by Grubbs catalysts have been enhanced by the simple addition of p-cresol. For example, the efficiency of the cross metathesis reaction between methyl acrylate and
Photoinduced electron transfer reactions of cyclopropanone acetal with conjugated enones in the presence of a redox-type photosensitizer
Abe, Manabu,Nojima, Masatomo,Oku, Akira
, p. 1833 - 1836 (1996)
Photoreactions of the cyclopropanone acetal 1 with conjugated enones 2 in the presence of phenanthrene or pyrene as a redox-type photosensitizer gave the corresponding cross-coupling product 3 or mixtures of 3 with 5 in good yields together with the β-carbonyl radical-dimer 4.
Zinc reduction of alkynes
Kaufman, Don,Johnson, Erin,Mosher, Michael D.
, p. 5613 - 5615 (2005)
The dissolving zinc metal reduction of ethyl phenylpropiolate to the corresponding cinnamate ester can be stereochemically controlled by changing the proton source in the reaction. The results of this study, while not fully understood, may imply that surf
Hexacoordinate phosphonium salts incorporating two (8-dimethylamino)-1-naphthyl ligands. Structure and reactivity
Carre,Chauhan,Chuit,Corriu,Reye
, p. 181 - 195 (1997)
New hexacoordinate phosphonium salts Ar2RZP+ X-[Ar = (8-dimethylamino)-1-naphthyl] with two N→P intramolecular coordinations are described. NMR studies of these salts and the X-ray structure of one of them. 5 (R = Ph, Z = H, X = Br) show that they have a dissymmetric structure with the two Me2N groups coordinated at the phosphorus centre. Salts 4 (R = Ph or Me, Z = CH2CO2Et) react slowly with PhCHO under Wittig conditions probably because of the steric hindrance around the phosphorus atom. This is confirmed by the higher reactivity of the less hindered pentacoordinate phosphonium salts ArR2P+CH2CO2Et X- 11 (R = Ph or Me) which are also much more reactive than Ph3P+CH2CO2Et Br-. This study points out the increase of reactivity of these salts due to the N→P interaction.
Palladium supported on graphene-like carbon: Preparation and catalytic properties
Kryukov, Alexander Yu.,Davydov, Sergey Yu.,Izvol'Skii, Igor M.,Rakov, Eduard G.,Abramova, Natalya V.,Sokolov, Viacheslav I.
, p. 237 - 238 (2012)
Graphene-like carbon, graphene shells, has been treated with Pd 2(dba)3 to afford the supported palladium/carbon material that provided moderate catalytic activity in the Suzuki and Heck reactions.
Triphasic liquid systems: Generation and segregation of catalytically active Pd nanoparticles in an ammonium-based catalyst-philic phase
Perosa, Alvise,Tundo, Pietro,Selva, Maurizio,Canton, Patrizia
, p. 4480 - 4482 (2006)
A triphasic liquid system fabricated from isooctane, aqueous base, and trioctylmethylammonium chloride/decanol promoted the formation of Pd-nanoparticles in the size range of 2-4 nm which remained immobilised in the onium phase, catalysed organic reactions, and could be recycled. The Royal Society of Chemistry 2006.
A Straightforward, Purification-Free Procedure for the Synthesis of Ando and Still-Gennari Type Phosphonates
Janicki, Ignacy,Kie?basiński, Piotr
, p. 378 - 382 (2021/10/21)
Z-Selective Still-Gennari and Ando modifications of the typically E-selective Horner-Wadsworth-Emmons reaction are highly valuable synthetic tools in organic chemistry. These procedures are based on application of bis(2,2,2-trifluoroethyl) phosphonates or diaryl phosphonates, respectively, for the olefination of carbonyl groups. In our research, we present an improved, straightforward, purificationfree procedure for the synthesis of these reagents. The key step of our procedure is the reaction of phosphonic dichlorides with the appropriate sodium alkoxides, which results in 52-97% isolated yields of the desired products on a gram scale. The whole three-step process is performed in one pot. Most importantly, the product is obtained in over 95% purity after simple extraction, avoiding column chromatography and distillation. Moreover, we present the synthesis of a novel Still-Gennari type reagent, bis(1,1,1,3,3,3-hexafluoroisopropyl) phosphonates, which may exhibit improved Z-selectivity in Still-Gennari olefinations.
Heteroleptic copper(I) complexes as energy transfer photocatalysts for the intermolecular [2 + 2] photodimerization of chalcones, cinnamates and cinnamamides
Wu, Qing-An,Ren, Chen-Chao,Chen, Feng,Wang, Tian-Qi,Zhang, Yu,Liu, Xue-Fen,Chen, Jian-Bin,Luo, Shu-Ping
, (2021/05/10)
The [2 + 2] photodimerization of chalcones, cinnamates and cinnamamides can be effectively catalyzed by heteroleptic copper(I) complexes. The reactions were carried out under mild reaction conditions and the products were obtained in 20–72% yield under visible light irradiation. The copper-based photocatalyst comprised of the rigid phenanthroline ligand with substituents at the 2,9-positions and the 4,7-positions showed high activity in the photodimerization via an energy transfer pathway.
