Tag: M.W:500-600

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Recommanded Product: 32005-36-0, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 32005-36-0, name is Bis(dibenzylideneacetone)palladium. In an article，Which mentioned a new discovery about 32005-36-0

Ditopic macrocyclic receptors with a 4,7-diamino-1,10-phenanthroline fragment for multimodal detection of toxic metal ions

A series of ditopic macrocyclic receptors with variable cavity sizes, containing nitrogen or mixed (nitrogen-oxygen) donor sites and an externally directed 1,10-phenanthroline fragment, were prepared by means of a palladium-catalyzed amination reaction. A ditopic mixed NO-ligand (4 a) was coordinated to [Ru(bpy)2]2+ (bpy=2,2?-bipyridine) to prepare a luminescent and chromogenic complex, [Ru(bpy)2(4 a)][PF]2, which provided the selective dual-channel detection of CuII ions. Seek and bind: A series of new phenanthroline-derived ditopic macrocyclic receptors with variable cavity sizes and nitrogen or nitrogen and oxygen donor sites are prepared through a palladium-catalyzed amination reaction (see scheme; dba=dibenzylideneacetone). One receptor coordinates to [Ru(bpy)2]2+ (bpy=2,2?-bipyridine) to give a selective dual-channel sensor for CuII ions.

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

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Pd/BIPHEPHOS is an Efficient Catalyst for the Pd-Catalyzed S-Allylation of Thiols with High n-Selectivity

The Pd-catalyzed S-allylation of thiols with stable allylcarbonate and allylacetate reagents offers several advantages over established reactions for the formation of thioethers. We could demonstrate that Pd/BIPHEPHOS is a catalyst system which allows the transition metal-catalyzed S-allylation of thiols with excellent n-regioselectivity. Mechanistic studies showed that this reaction is reversible under the applied reaction conditions. The excellent functional group tolerance of this transformation was demonstrated with a broad variety of thiol nucleophiles (18 examples) and allyl substrates (9 examples), and could even be applied for the late-stage diversification of cephalosporins, which might find application in the synthesis of new antibiotics. (Figure presented.).

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

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1,6-Diene complexes of palladium(0) and platinum(0): Highly reactive sources for the naked metals and [L-M0] fragments

The complexes (cod)MCl2 (M = Pd, Pt; cod = cis,cis-1,5-cyclooctadiene) react with Li2(cot) (cot = cyclooctatetraene) in a 1,6-diene/diethyl ether mixture (1,6-diene = hepta-1,6-diene, diallyl ether, dvds (1,3-divinyl- 1,1,3,3-tetramethyldisiloxane)) to afford the isolated homoleptic dinuclear Pd0 and Pt0 compounds Pd2(C7H12)3 (1), Pd2(C6H10O)3·C6H10O (2′; 2: Pd2(C6H10O)3), Pd2(dvds)3 (3), and Pt2(C7H12)3 (4). When 1-4 are treated with additional 1,6-diene the equally homoleptic but mononuclear derivatives of type M(1,6-diene)2 (5-8) and with ethene the mixed alkene complexes (C2H4)M(1,6-diene) (9-12) are obtained in solution. Complexes 1-12 react with donor ligands such as phosphanes, phosphites, or (t)BuNC to give isolated complexes of types L-M(1,6-diene) (13-41), which have also been prepared by other routes. In all complexes the metal centers are TP-3 coordinated: complexes 1-4 contain chelating and bridging 1,6-diene ligands, whereas the other complexes contain a chelating 1,6-diene ligand and an eta2-alkene (5-12) or eta1-donor ligand (13-41). Of the studied 1,6-diene complexes the hepta-1,6-diene derivatives are most reactive, while the diallyl ether complexes are often more convenient to handle. The readily isolable dinuclear hepta-1,6-diene and diallyl ether complexes 1, 2′, and 4, and their mononuclear pure olefin derivatives are among the most reactive sources for naked Pd0 and Pt0. The corresponding L-M(1,6-diene) complexes are equally reactive precursor compounds for the generation of [L-M0] fragments in solution, which for M =Pd are available otherwise only with difficulty. The results are significant for the operation of naked Pd0 and L-Pd0 catalysts in homogeneous catalysis.

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

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Palladium-catalyzed arylation of open-cage silsesquioxanes toward thermally stable and highly dispersible nanofillers

Incompletely condensed polyhedral oligomeric silsesquioxanes (IC-POSS) are promising building blocks for the development of organic-inorganic hybrid materials. Pd-catalyzed arylation of heptaphenyl IC-POSS has been developed to introduce various substituents on to the open moieties without using highly moisture-sensitive chlorosilane derivatives. The substituents drastically affected the thermal behavior of the corresponding IC-POSSs. The obtained IC-POSSs were well dispersed in poly(methyl methacrylate) (PMMA) matrices to tune the thermal and optical properties of their composite films.

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

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Iridium-catalyzed diborylation of benzylic C-H bonds directed by a hydrosilyl group: Synthesis of 1,1-benzyldiboronate esters

We describe a regioselective diborylation of primary benzylic C-H bonds catalyzed by [Ir(COD)OMe]2 and 4,4?-di-tert-butyl-2,2?- bipyridine (dtbpy). The hydrosilyl group acts as a traceless directing group, providing access to a range of 1,1-benzyldiboronate esters in good yields. Transformations of the 1,1-benzyldiboronate ester products include chemoselective Suzuki-Miyaura cross-couplings and synthesis of tetrasubstituted alkenyl boronate esters.

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

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Discovery of 6-[5-(4-fluorophenyl)-3-methyl-pyrazol-4-yl]-benzoxazin-3-one derivatives as novel selective nonsteroidal mineralocorticoid receptor antagonists

In the course of our study on selective nonsteroidal mineralocorticoid receptor (MR) antagonists, a series of novel benzoxazine derivatives possessing an azole ring as the core scaffold was designed for the purpose of attenuating the partial agonistic activity of the previously reported dihydropyrrol-2-one derivatives. Screening of alternative azole rings identified 1,3-dimethyl pyrazole 6a as a lead compound with reduced partial agonistic activity. Subsequent replacement of the 1-methyl group of the pyrazole ring with larger lipophilic side chains or polar side chains targeting Arg817 and Gln776 increased MR binding activity while maintaining the agonistic response at the lower level. Among these compounds, 6-[1-(2,2-difluoro-3-hydroxypropyl)-5-(4-fluorophenyl)-3-methyl-1H-pyrazol-4-yl]-2H-1,4-benzoxazin-3(4H)-one (37a) showed highly potent in vitro activity, high selectivity versus other steroid hormone receptors, and good pharmacokinetic profiles. Oral administration of 37a in deoxycorticosterone acetate-salt hypertensive rats showed a significant blood pressure-lowering effect with no signs of antiandrogenic effects.

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

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Product Details of 32005-36-0, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 32005-36-0, Name is Bis(dibenzylideneacetone)palladium, molecular formula is C34H28O2Pd

Readily regenerative and air-stable palladium(0) catalyst with tris[2-(diphenylphosphino)ethyl]phosphine tetrasulfide for C-C coupling reactions

The novel air-stable Pd0 complex, [Pd(pp3S 4)(dba)] (pp3S4 = tris[2-(diphenylphosphino) ethyl]phosphine tetrasulfide, dba = dibenzylideneacetone) was prepared as a C-C coupling catalyst. This is regenerative from the Pd complex with the partially oxidized pp3S4 ligand by the chalcogen-atom substitution reaction catalyzed by Pd0 and applicable to the recyclable Pd0 catalytic system. Copyright

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

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Benzoyl Fluorides as Fluorination Reagents: Reconstruction of Acyl Fluorides via Reversible Acyl C-F Bond Cleavage/Formation in Palladium Catalysis

This report describes the formation of value-added acyl fluorides by means of palladium-catalyzed acyl-exchange reactions between acyl fluorides and acid anhydrides. This method allows using a simple and commercially available acyl fluoride, benzoyl fluoride, as the fluoride source for the easy and efficient preparation of a variety of more complex acyl fluorides. The results of this study suggest that this reaction proceeds via a reversible acyl C-F bond cleavage/formation at the palladium center.

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

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Palladium-Catalyzed Domino Heck/Silylation Reaction for the Synthesis of (2-Oxoindolin-3-yl)methylsilanes via Trapping of the sigma-Alkylpalladium Intermediates with Disilanes

A palladium-catalyzed domino Heck/silylation reaction of acrylamides with hexamethyldisilane is presented. This transformation, which involves the formation of a sigma-alkylpalladium intermediate, allows direct access to functionalized (2-oxoindolin-3-yl)methylsilanes in good to excellent yields. Furthermore, this strategy could be utilized for the synthesis of (2-oxoindolin-3-yl)methylstannanes from hexamethyldistannane. (Figure presented.).

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

Chemistry is traditionally divided into organic and inorganic chemistry. COA of Formula: C34H28O2Pd, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 32005-36-0

Optically active 2,3-allenoates via palladium-catalyzed carbonylation of enantioenriched propargylic mesylates

Under mild conditions, optically active 2,3-allenoates were synthesized from enantioenriched propargylic mesylates with moderate to excellent yields and high efficiency of chirality transfer by using palladium(0) bis(dibenzylideneacetone) (3 mol%) with (S)-(-)-5,5?- bis(diphenylphosphino)-4,4?-bi-1,3-benzodioxole [(S)-SEGPHOS] (3 mol%) as the catalyst and diammonium hydrogen phosphate (1.1 equiv.) as the base. Copyright

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