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关键词:'palladium'
显示 1-30 共 2536 条结果 关于 "palladium" 范围 论文
Zhe Dong et al.
Angewandte Chemie (International ed. in English), 54(43), 12664-12668 (2015-09-04)
Reported herein is a palladium/norbornene-catalyzed ortho-arene acylation of aryl iodides by a Catellani-type C-H functionalization. This transformation is enabled by isopropyl carbonate anhydrides, which serve as both an acyl cation equivalent and a hydride source.
Zhang Feng et al.
Angewandte Chemie (International ed. in English), 54(4), 1270-1274 (2014-12-04)
An efficient palladium-catalyzed Heck-type reaction of fluoroalkyl halides, including perfluoroalkyl bromides, trifluoromethyl iodides, and difluoroalkyl bromides, has been developed. The reaction proceeds under mild reaction conditions with high efficiency and broad substrate scope, and provides a general and straightforward access
Su-Jin Hwang et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(15), 5872-5878 (2015-02-26)
Pure and palladium-loaded Co3O4 hollow hierarchical nanostructures consisting of nanosheets have been prepared by solvothermal self-assembly. The nanostructures exhibited an ultrahigh response and selectivity towards p-xylene and toluene. The responses (resistance ratio) of the palladium-loaded Co3O4 hollow hierarchical nanostructures to
Ji Su et al.
ChemSusChem, 8(5), 813-816 (2015-02-11)
A highly efficient, reversible hydrogen storage-evolution process has been developed based on the ammonium bicarbonate/formate redox equilibrium over the same carbon-supported palladium nanocatalyst. This heterogeneously catalyzed hydrogen storage system is comparable to the counterpart homogeneous systems and has shown fast
Muhammad Jbara et al.
Angewandte Chemie (International ed. in English), 60(21), 12109-12115 (2021-03-18)
Organometallic reagents enable practical strategies for bioconjugation. Innovations in the design of water-soluble ligands and the enhancement of reaction rates have allowed for chemoselective cross-coupling reactions of peptides and proteins to be carried out in water. There are currently no
Matthew Nieberding et al.
ACS sensors, 2(11), 1737-1743 (2017-10-24)
Palladium is a highly valuable metal in automobile, chemical, and pharmaceutical industries. The metal is generally quantified by atomic absorption spectrometry or inductively coupled plasma mass spectrometry. These techniques are tedious and require expensive instruments that are operated mostly off
Xin Chang et al.
ChemSusChem, 9(23), 3330-3337 (2016-11-20)
The catalytic transfer hydrogenation of furfural to the fuel additives 2-methylfuran (2-MF) and 2-methyltetrahydrofuran (2-MTHF) was investigated over various bimetallic catalysts in the presence of the hydrogen donor 2-propanol. Of all the as-prepared catalysts, bimetallic Cu-Pd catalysts showed the highest
Yahao Dong et al.
Carbohydrate polymers, 260, 117815-117815 (2021-03-14)
Chitosan is a versatile polysaccharide in different domains due to facile modification and good biodegradability. In this paper, taking advantage of such functional properties, we have developed a stabilizer agent [OCMCS-SB] produced from chitosan, and palladium was successfully immobilized on
Todd D Senecal et al.
Angewandte Chemie (International ed. in English), 52(38), 10035-10039 (2013-08-13)
Playing it safe: The nontoxic cyanide source K4 [Fe(CN)6]·3H2O can be used for the cyanation of (hetero)aryl halides. The application of palladacycle catalysts prevents poisoning during catalyst formation, thereby allowing for low catalyst loadings, fast reaction times, and wide heterocyclic
Xiao-Feng Wu et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 19(37), 12245-12248 (2013-08-14)
Cute CO! An interesting and straightforward procedure for the carbonylative synthesis of chromenones from readily available salicylic aldehydes and benzyl chlorides has been developed (see scheme; DPPP = 1,3-bis(diphenylphosphino)propane). In the presence of a palladium catalyst, various coumarins were produced
Nathaniel H Park et al.
Angewandte Chemie (International ed. in English), 54(28), 8259-8262 (2015-06-03)
In Pd-catalyzed C-N cross-coupling reactions, α-branched secondary amines are difficult coupling partners and the desired products are often produced in low yields. In order to provide a robust method for accessing N-aryl α-branched tertiary amines, new catalysts have been designed
Masaru Kondo et al.
Angewandte Chemie (International ed. in English), 54(28), 8198-8202 (2015-05-28)
The catalytic enantioselective reaction of diphenylmethylidene-protected α-aminoacetonitriles with imines has been developed. Good yields and diastereo- and enantioselectivities were observed for the reaction of various imines using chiral bis(imidazoline)/Pd catalysts. The reaction of α-aminonitriles with di-tert-butyl azodicarboxylate afforded chiral α,α-diaminonitriles
Salvatore Abate et al.
ChemSusChem, 8(22), 3805-3814 (2015-10-29)
Palladium ultrathin films (around 2 μm) with different surface nanostructures are characterized by TEM, SEM, AFM, and temperature programmed reduction (TPR), and evaluated in terms of H2 permeability and H2-N2 separation. A change in the characteristics of Pd seeds by controlled
Talat Baran et al.
International journal of biological macromolecules, 161, 1559-1567 (2020-08-14)
Removal of organic pollutants such as aromatic nitro compounds and dyes from wastewaters is very significant for environment, and the best strategy is their reduction/degradation in the presence of a metal catalyst. In this study, a new palladium nanocatalyst (GA-Sch-Pd)
Yifeng Chen et al.
Angewandte Chemie (International ed. in English), 56(28), 8258-8262 (2017-06-01)
The telescoping of allyl-palladium catalyzed ketone dehydrogenation with organocuprate conjugate addition chemistry allows for the introduction of aryl, heteroaryl, vinyl, acyl, methyl, and other functionalized alkyl groups chemoselectively to a wide variety of unactivated ketone compounds via their enone counterparts.
Toshimasa Suzuka et al.
Molecules (Basel, Switzerland), 20(6), 9906-9914 (2015-06-02)
A polymer-supported terpyridine palladium complex was prepared. The complex was found to promote hydrodechlorination of aryl chlorides with potassium formate in seawater. Generally, reductive cleavage of aryl chlorides using transition metal catalysts is more difficult than that of aryl bromides
Arik Monash et al.
Talanta, 224, 121927-121927 (2021-01-01)
Small-molecule detection is important for many applications including clinical diagnostics, drug discovery, environmental screening, and food technology. Current techniques suffer from various limitations including cost, complex sample processing, massive instrumentation, and need for expertise. To overcome these limitations, a new
Cecilia Tillman et al.
Contact dermatitis, 69(5), 288-295 (2013-08-06)
Since the EU Nickel Directive came into force, concern has been raised that palladium may increasingly replace nickel in alloys used in jewellery and dentistry, and that it may cause as many allergy problems as nickel. (i) To investigate the
Chengyang Wu et al.
Water research, 188, 116465-116465 (2020-10-14)
We created a hydrogen-based membrane palladium-film reactor (MPfR) by depositing palladium nanoparticles (PdNPs) on hollow-fiber membranes via autocatalytic hydrogenation to form a Pd-film. The MPfR was used for hydrodechlorination (HDC) of 2,4-dichlorophenol (2,4-DCP). HDC performances and mechanisms were systematically evaluated
Shengyang Fu et al.
Journal of nanobiotechnology, 20(1), 299-299 (2022-06-26)
Traumatic brain injury (TBI) is a cause of disability and death worldwide, but there are currently no specific treatments for this condition. Release of excess reactive oxygen species (ROS) in the injured brain leads to a series of pathological changes;
Laura Pietrovito et al.
Proteomics, 15(1), 34-43 (2014-10-31)
Amino polystyrene nanospheres are shown to be efficient and controllable delivery devices, capable of transporting several bioactive cargoes. Recently, the design of a new device for prodrug activation, using these nanospheres with palladium encapsulated onto them, has been developed successfully.
Yasushi Amada et al.
ChemSusChem, 7(8), 2185-2192 (2014-07-01)
Hydrodeoxygenation of cyclic vicinal diols such as 1,4-anhydroerythritol was conducted over catalysts containing both a noble metal and a group 5-7 transition-metal oxide. The combination of Pd and WOx allowed the removal of one of the two OH groups selectively.
Chihiro Tsukano et al.
Chemical & pharmaceutical bulletin, 65(12), 1167-1174 (2017-12-05)
Tetrahydrobiphenylene consists of cyclobutene fused with benzene and cyclohexene rings. In this paper, a direct method for synthesizing tetrahydrobiphenylenes based on a palladium (Pd)(0)-catalyzed C(sp
Ravi Mani Tripathi et al.
Molecules (Basel, Switzerland), 25(15) (2020-07-29)
Hydrogen peroxide is a low-reactivity reactive oxygen species (ROS); however, it can easily penetrate cell membranes and produce highly reactive hydroxyl radical species through Fenton's reaction. Its presence in abnormal amounts can lead to serious diseases in humans. Although the
Didem Karakas et al.
Bioorganic & medicinal chemistry, 23(17), 5580-5586 (2015-08-04)
Wnt signaling is one of the core signaling pathways of cancer stem cells (CSCs). It is re-activated in CSCs and plays essential role in the survival, self-renewal and proliferation of these cells. Therefore, we aimed to evaluate the cytotoxic effects
Srinu Nagireddi et al.
International journal of biological macromolecules, 127, 320-329 (2019-01-15)
This article targets the efficacy of chitosan cross-linked 3-Amino-1,2,4-triazole-5-thiol derivative for the recovery of Pd from synthetic electroless plating solutions (ELP) whose solution chemistry complexity is brought forward with ethylenediaminetetraacetic acid (EDTA), ammonium hydroxide (NH4OH), and surfactant (cetyl trimethyl ammonium
Dennis U Nielsen et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 19(52), 17926-17938 (2013-11-23)
Reaction conditions for the three-component synthesis of aryl 1,3-diketones are reported applying the palladium-catalyzed carbonylative α-arylation of ketones with aryl bromides. The optimal conditions were found by using a catalytic system derived from [Pd(dba)2] (dba=dibenzylideneacetone) as the palladium source and
Sepideh Sharif et al.
Angewandte Chemie (International ed. in English), 54(33), 9507-9511 (2015-06-23)
A single set of reaction conditions for the palladium-catalyzed amination of a wide variety of (hetero)aryl halides using primary alkyl amines has been developed. By combining the exceptionally high reactivity of the Pd-PEPPSI-IPent(Cl) catalyst (PEPPSI=pyridine enhanced precatalyst preparation, stabilization, and
Ademar Wong et al.
Talanta, 222, 121539-121539 (2020-11-11)
The present study reports the development of graphite pencil electrode modified with palladium nanoparticles (PdNPs) and its application as an electrochemical sensor for the simultaneous detection of direct yellow 50, tryptophan, carbendazim and caffeine in river water and synthetic urine
Fatemeh Shafizadeh et al.
Environmental science and pollution research international, 26(18), 18493-18508 (2019-05-03)
A novel magnetic ion-imprinted polymer with high accessibility to palladium ions was synthesized via co-precipitation polymerization. Accordingly, a ternary complex composed of PdCl2 as an imprinting ion, 8-aminoquinoline (AQ) as a ligand, and 4-vinyl pyridine (4-VP) as a complexing monomer
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