92-92-2Relevant articles and documents
A bimetallic complex containing a cyclopentadienyl-annulated imidazol-2-ylidene
Arduengo III, Anthony J.,Tapu, Daniela,Marshall, William J.
, p. 16400 - 16401 (2005)
A bimetallic carbene complex architecture that incorporates a cyclopentadienyl-annulated imidazol-2-ylidene moiety is characterized. The ligand architecture enables direct electronic interaction between the π- and σ-bonded metals. A preliminary example of aqueous Suzuki coupling employing a metallocene-fused imidazol-2-ylidene-derived catalyst is described. Copyright
Peptide template effects for the synthesis and catalytic application of Pd nanoparticle networks
Jakhmola, Anshuman,Bhandari, Rohit,Pacardo, Dennis B.,Knecht, Marc R.
, p. 1522 - 1531 (2010)
Translation of nanomaterials from spherical to other shapes has demonstrated property and activity enhancement for applications ranging from optics to catalysis. Unfortunately, synthetic techniques for the controlled production of shaped nanomaterials, which can employ harsh conditions, remains challenging. In contrast, the fabrication of nanostructures using peptides has achieved the generation of functionally active materials using bio-conditions; however, these methods are typically limited to spherical materials. By merging these techniques, the biomimetic/ambient production of functional, shaped nanostructures may be achieved. Here we present the fabrication of non-spherical Pd nanostructures prepared using a peptide template. By controlling the Pd: peptide ratio, the production of at least three different Pd morphologies is possible: nanoparticles, short linear nanoribbons, and nanoparticle networks. Furthermore, all of the materials are active for Stille C-coupling catalysis using aqueous and room temperature conditions at low Pd concentrations. The results suggest that both the zerovalent Pd materials and the ligand surface structure modulate the reactivity, which may be exploitable for optimal functionality. The Royal Society of Chemistry 2010.
Morton,Massengale,Richardson
, p. 126,128 (1940)
Photosensitizing properties of 2,4-dichlorobenzoic acid and chlorinated biphenyl carboxylic acids, potentially key components of chromophoric dissolved organic matter
Boreen, Anne L.,McNeill, Kristopher
, p. 4113 - 4115 (2005)
2,4-Dichlorobenzoic acid and a suite of models of chlorinated biphenyl carboxylic acids were found to be efficient sensitizers of the reactive oxygen species singlet oxygen (1O2). The Royal Society of Chemistry 2005.
G-/C-rich oligonucleotides stabilized pd nanocatalysts for the Suzuki coupling reaction under mild conditions
Li, Wei,Fu, Yingming,Fu, Yan,Wang, Xian,Zhang, Jinli
, p. 578 - 586 (2013)
Pd nanoparticles with narrow size distributions between 1.3 and 3.3 nm are prepared using G-/C-rich oligonucleotide as the template. These DNA-Pd nanoparticles efficiently catalyze the Suzuki coupling reaction and exhibit highly catalytic activities under mild conditions, which are greatly dependent upon the particle size of Pd nanoparticles besides the DNA sequence. For the coupling reaction of iodobenzene and phenylboronic acid at 60 C in the presence of KOH, it can be achieved high TOF value of 2646 mol biphenyl (mol Pd × h)-1 over AG22-Pd and 3640 mol biphenyl (mol Pd × h) -1 over CT22-Pd. Under the optimal experimental conditions, the yield of 100 % in biphenyl is obtained with only 0.0055 mol% AG22-Pd at 60 C for 1 h in the solvent of EtOH/H2O (1:2) using Na2CO3 or K2CO3 as the base. It is illustrated that G-/C-rich oligonucleotides are promising templates to modulate easily the morphology of Pd nanoparticles in aqueous solution with high catalytic activity.
Rapid and amenable Suzuki coupling reaction in water using microwave and conventional heating
Leadbeater, Nicholas E.,Marco, Maria
, p. 888 - 892 (2003)
It is possible to prepare biaryls in good yield very rapidy (5-10 min) on small (1 mmol) and larger (10-20 mmol) scales from aryl halides and phenylboronic acid using water as a solvent and palladium acetate as catalyst. The reaction can be performed equally well using microwave and conventional heating, showing that using these conditions probably no nonthermal microwave effects are associated with the impressive speed of the reaction.
Langmuir-Blodgett films of cyclopalladated ferrocenylimine: preparation, characterization, and application in Suzuki coupling reaction
Mu, Bing,Li, Tiesheng,Li, Chenghuan,Liu, Pingping,Shang, Wei,Wu, Yangjie
, p. 2599 - 2604 (2009)
Langmuir monolayer and Langmuir-Blodgett (LB) films of cyclopalladated ferrocenylimine 1 were prepared and characterized. The surface pressure (π)-area (A) isotherm of complex 1 indicated the formation of highly condensed monolayer on the subphase. Ultraviolet-visible (UV-vis) and Fourier transform infrared (FTIR) spectroscopy showed that complex 1 monolayer was transferred successfully onto solid supports. Atomic force microscopy (AFM) image suggested that LB films transferred on the solid substrate were well-ordered, homogeneous. Cyclic voltammograms of LB films deposited on glassy carbon electrodes showed quasi-reversible oxidation/reduction waves of ferrocene moiety. From the average thickness of monolayer, the hydrocarbon chain could be fairly directed perpendicular to the substrates. Finally, LB films of complex 1 presented a largely improved catalytic efficiency for Suzuki reaction with respect to its cast films and homogeneous reactions under the same conditions. The results might have an implication on the catalytic mechanism of this reaction.
Transformation of Thioacids into Carboxylic Acids via a Visible-Light-Promoted Atomic Substitution Process
Fu, Qiang,Liang, Fu-Shun,Lou, Da-Wei,Pan, Gao-Feng,Wang, Rui,Wu, Min,Xie, Kai-Jun
supporting information, p. 2020 - 2024 (2022/03/31)
A visible-light-promoted atomic substitution reaction for transforming thiocacids into carboxylic acids with dimethyl sulfoxide (DMSO) as the oxygen source has been developed, affording various alkyl and aryl carboxylic acids in over 90% yields. The atomic substitution process proceeds smoothly through the photochemical reactivity of the formed hydrogen-bonding adduct between thioacids and DMSO. A DMSO-involved proton-coupled electron transfer (PCET) and the simultaneous generation of thiyl and hydroxyl radicals are proposed to be key steps for realizing the transformation.
Magnetic covalently immobilized nickel complex: A new and efficient method for the Suzuki cross-coupling reaction
Keyhaniyan, Mahdi,Khojastehnezhad, Amir,Eshghi, Hossein,Shiri, Ali
, (2021/01/12)
In this study, an efficient procedure was reported to prepare Fe3O4@SiO2 magnetic nanoparticles (MNPs) with immobilized nickel NPs. In order to increase the activity of this catalyst, creatine as a ligand with high content of nitrogen atoms was linked onto the magnetic core–shell structure. Then, Ni(II) ions were coordinated on the surface of the silica-coated MNPs and reduced to Ni(0) NPs to obtain the final catalyst. The catalytic activity of the prepared catalyst was studied for the synthesis of biaryl derivatives via the Suzuki–Miyaura cross-coupling reaction in high yields. The catalyst could also be recovered and reused with no loss of activity over five successful runs.