Category: catalyst-palladium

52522-40-4, In heterogeneous catalysis, the catalyst is in a different phase from the reactants. At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 52522-40-4, name is Tris(dibenzylideneacetone)dipalladium-chloroform. In an article£¬Which mentioned a new discovery about 52522-40-4

An efficient method for the enantioselective construction of tertiary 1,3-diols via Pd-catalyzed asymmetric allylic cycloaddition of vinyloxetanes with an abundant feedstock, formaldehyde, is developed. Using the palladium complex generated in situ from Pd2(dba)3¡¤CHCl3 and phosphoramidite L3 as a catalyst under mild conditions, the process allows one to convert racemic 2-substituted 2-vinyloxetanes (1) to the corresponding 1,3-dioxanes (2) as methylene acetal protected tertiary 1,3-diols in high yields with good to excellent enantioselectivities.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

72287-26-4, Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 72287-26-4

Disclosed herein are therapeutic agents and/or preventive agents for pain or therapeutic agents and/or preventive agents for a sodium channel associated disease. The present invention provides compounds represented by the following formula (I) or pharmacologically acceptable salts thereof:

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

53199-31-8, Name is Bis(tri-tert-butylphosphine)palladium, belongs to catalyst-palladium compound, is a common compound. 53199-31-8In an article, authors is Adams, Richard D., once mentioned the new application about 53199-31-8.

The new tetrahedral complex Os4(CO)12[Pd(PBu 3t)]4, 3, was obtained from the reaction of Os3(CO)12 with Pd(PBu3t)2 in octane solution at reflux. Compound 3 was characterized by IR, 1H and 31P NMR spectroscopy, mass spectroscopy, and single-crystal X-ray diffraction analysis. The electronic structure of 3 was evaluated by Fenske-Hall molecular orbital analysis. Compound 3 is electronically unsaturated and reacts with hydrogen at room temperature to yield the known compound Os4(CO)12(mu-H)4, 4.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. 52522-40-4. Introducing a new discovery about 52522-40-4, Name is Tris(dibenzylideneacetone)dipalladium-chloroform

The mechanism of the palladium-catalyzed synthesis of allylic silanes and boronates from allylic alcohols was investigated. 1H, 29Si, 19F, and 11B NMR spectroscopy was used to reveal key intermediates and byproducts of the silylation reaction. The tetrafluoroborate counterion of the palladium catalyst is proposed to play an important role in both catalyst activation as well as the transmetalation step. We propose that BF3 is generated in both processes and is responsible for the activation of the substrate hydroxyl group. An (eta3- allyl)palladium complex has been identified as the catalyst resting state, and the formation of (eta3-allyl)palladium complexes directly from allylic alcohols has been studied. Kinetic analysis provides evidence that the turnover limiting step is the transmetalation, and insights into notable similarities between the borylation and the silylation reaction mechanisms enabled us to considerably improve the stereoselectivity of the borylation.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

72287-26-4, Name is [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), belongs to catalyst-palladium compound, is a common compound. 72287-26-4In an article, authors is Almeida Lenero, Karina Q., once mentioned the new application about 72287-26-4.

Wide bite angle diphosphine ligands were used to prepare [(diphosphine)M(2-(diphenylphosphino)pyridine)]2+ complexes (M = Pd, Pt). Except for the ligand with the largest bite angle, 2-(diphenylphosphino) pyridine coordinates in a bidentate mode leading to bis-chelate complexes. In the case of Xantphos (9,9-dimethyl-4,5-bis(diphenylphosphino)-xanthene, betan = 111) two types of complexes are formed, in which 2-(diphenylphosphino)pyridine coordinates in a mono- or bidentate fashion, respectively. The crystal structures of three of the Pt complexes were determined. The X-ray crystal structure of [(Xantphos)-Pt(2-(diphenylphosphino) pyridine)]2+ shows that Xantphos coordinates in a tridentate P,O,P fashion. Under dihydrogen pressure, the pyridyl moiety in the platinum complexes can de-coordinate to provide a vacant coordination site at the metal center. Furthermore it can act as an internal base to assist the heterolytic cleavage of dihydrogen. The reaction yields a platinum hydride with a protonated pyridine moiety in close proximity to one another. The structure as well as the reactivity of the complexes towards dihydrogen is governed by the steric requirements of the diphosphines. The crystal structure of [(dppf)PtH(2- (diphenylphosphino)pyridinium)](OTf)2 has been determined. Palladium complexes containing DPEphos or Xantphos decompose under dihydrogen pressure. In the case of dppf slow heterolytic splitting of dihydrogen occurs to form the hydride complex [(dppf)PdH(2-(diphenylphosphino)pyridinium)](OTf)2 which contains a protonated 2-(diphenylphosphino)pyridine ligand. In solution, this compound slowly undergoes P-C bond cleavage of the 2-(diphenylphosphino) pyridine ligand to form [(dppf)Pd(PHPh2)(eta1-C 5H4NH)](OTf)2. When the 6-methyl-2- pyridyldiphenylphosphine ligand is used, the reaction of the palladium complex with dihydrogen is very fast and the hydride complex immediately rearranges to the diphenylphosphino compound resulting from P-C bond cleavage.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

32005-36-0, Name is Bis(dibenzylideneacetone)palladium, belongs to catalyst-palladium compound, is a common compound. 32005-36-0In an article, authors is Banerjee, Debasis, once mentioned the new application about 32005-36-0.

Cooperative catalysis by [Pd(dba)2] and the chiral phosphoric acid BA1 in combination with the phosphoramidite ligand L8 enabled the efficient enantioselective amination of racemic allylic alcohols with a variety of functionalized amines. This catalytic protocol is highly regio-and stereoselective (up to e.r. 96:4) and furnishes valuable chiral amines in almost quantitative yield.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

95464-05-4, In an article, published in an article,authors is Bringmann, Gerhard, once mentioned the application of 95464-05-4, Name is 1,1′-Bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex,molecular formula is C35H32Cl4FeP2Pd, is a conventional compound. this article was the specific content is as follows.

In this paper, the synthesis of a new type of intrinsically chiral, directly beta,beta’-linked, octa-mesoaryl-substituted bisporphyrins is described, by using an optimized Suzuki-Miyaura coupling procedure. This strategy leads to a broad variety of such axially chiral ‘superbiaryls’, differing in their metalation states and substitution patterns. On the basis of an efficient route to as-yet-unknown beta-boronic acid esters of various meso-tetraarylporphyrins (TAPs) by a two-step bromination-borylation protocol, 18 axially chiral bisporphyrin derivatives were prepared in good to excellent yields. As compared to all other directly linked dimeric porphyrin systems, the joint presence of eight bulky meso substituents and the peripheral position of the porphyrin-porphyrin linkage is unprecedented. The axial configurations and rotational barriers of the pure atropo-enantiomers were investigated by HPLC-CD experiments on a chiral phase in combination with quantum chemical CD calculations. According to the HPLC experiments and in agreement with quantum chemical calculations by applying the dispersion-corrected BLYP method, the configurational stability of the central porphyrin-porphyrin axis strongly depends on the nature of the central metals. Cyclovoltammetric studies proved the systematic influence of the meso substituents and of the metal ions on the oxidation potentials of the bisporphyrins. The novel axially chiral bis(tetrapyrrole) compounds described here are potentially useful as substrates for asymmetric catalysis, biomimetic studies on directed electron-transfer processes, for photodynamic therapy (PDT), and for chiral recognition.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

14871-92-2, An article , which mentions 14871-92-2, molecular formula is C10H8Cl2N2Pd. The compound – (2,2¡ä-Bipyridine)dichloropalladium(II) played an important role in people’s production and life.

Multi-target heteroleptic palladium bisphosphonate complexes

Abstract: Bisphosphonates are the most commonly prescribed drugs for the treatment of osteoporosis and other bone illnesses. Some of them have also shown antiparasitic activity. In search of improving the pharmacological profile of commercial bisphosphonates, our group had previously developed first row transition metal complexes with N-containing bisphosphonates (NBPs). In this work, we extended our studies to heteroleptic palladium?NBP complexes including DNA intercalating polypyridyl co-ligands (NN) with the aim of obtaining potential multi-target species. Complexes of the formula [Pd(NBP)2(NN)]¡¤2NaCl¡¤xH2O with NBP = alendronate (ale) or pamidronate (pam) and NN = 1,10 phenanthroline (phen) or 2,2?-bipyridine (bpy) were synthesized and fully characterized. All the obtained compounds were much more active in vitro against T. cruzi (amastigote form) than the corresponding NBP ligands. In addition, complexes were nontoxic to mammalian cells up to 50?100 muM. Compounds with phen as ligand were 15 times more active than their bpy analogous. Related to the potential mechanism of action, all complexes were potent inhibitors of two parasitic enzymes of the isoprenoid biosynthetic pathway. No correlation between the anti-T. cruzi activity and the enzymatic inhibition results was observed. On the contrary, the high antiparasitic activity of phen-containing complexes could be related to their ability to interact with DNA in an intercalative-like mode. These rationally designed compounds are good candidates for further studies and good leaders for future drug developments. Graphic abstract: Four new palladium heteroleptic complexes with N-containing commercial bisphosphonates and DNA intercalating polypyridyl co-ligands were synthesized and fully characterized. All complexes displayed high anti-T. cruzi activity which could be related to the inhibition of the parasitic farnesyl diphosphate synthase enzyme but mainly to their ability to interact DNA. [Figure not available: see fulltext.]

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

52409-22-0, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 52409-22-0, Name is Pd2(DBA)3, molecular formula is C51H42O3Pd2. In a Article, authors is Prasad, Bagineni£¬once mentioned of 52409-22-0

Conformationally restricted functionalized heteroaromatics: A direct access to novel indoloindoles via Pd-mediated reaction

A new, versatile and direct Pd-mediated method involving intramolecular cyclization of N-(2-iodoaryl)-N-(1-alkyl-1H-indol-2-yl)alkane/arene/heteroarene sulfonamide has been developed leading to a diverse and unique class of indolo[2,3-b]indoles for the potential inhibition of sirtuins.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method

53199-31-8, Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬Which mentioned a new discovery about 53199-31-8

NOVEL HETEROCYCLIC COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME

The present invention provides a novel heterocyclic compound and an organic light emitting element using the same.

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Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method