Day: July 22, 2021

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Organometallic Ru(II)-cymene complexes linked to ferrocene (Fc) via nitrogen heterocycles have been synthesized and studied as cytotoxic agents. These compounds are analogues of Ru(II)-arene piano-stool anticancer complexes such as RAPTA-C. The Ru center was coordinated by pyridine, imidazole, and piperidine with 0-, 1-, or 2-carbon bridges to Fc to give six bimetallic, dinuclear compounds, and the properties of these complexes were compared with their non-Fc-functionalized parent compounds. Crystal structures for five of the compounds, their Ru-cymene parent compounds, and an unusual trinuclear compound were determined. Cyclic voltammetry was used to determine the formal MIII/II potentials of each metal center of the Ru-cymene-Fc complexes, with distinct one-electron waves observed in each case. The Fc-functionalized complexes were found to exhibit good cytotoxicity against HT29 human colon adenocarcinoma cells, whereas the parent compounds were inactive. Similarly, antibacterial activity from the Ru-cymene-Fc compounds was observed against Bacillus subtilis, but not from the unfunctionalized complexes. In both cases, the IC50 values correlated quantitatively with the Fc+/0 reduction potentials. This is consistent with more facile oxidation to give ferrocenium, and subsequent generation of toxic reactive oxygen species, leading to greater cytotoxicity. The antioxidant properties of the complexes were quantified by a 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay. EC50 values indicate that linking of the Ru and Fc centers promotes antioxidant activity.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

Chemistry involves the study of all things chemical – chemical processes, Synthetic Route of 1273-86-5, chemical compositions and chemical manipulation – in order to better understand the way in which materials are structured, how they change and how they react in certain situations. In a patent，Which mentioned a new discovery about 1273-86-5

Mononuclear Zr complexes CpZrCl2{eta5-C 5H4(CH2)nCH=CH2} (n = 1, 2, 3) undergo intermolecular metathesis of the vinyl group catalyzed by a Ru complex to produce dinuclear complexes with bridging ligands, (CpZrCl 2)2 {mu-eta5-eta5-C 5H4(CH2)nC5H 4}. Hydrogenation of the products catalyzed by Pd/C affords complexes with a flexible polymethylene chain that bridges two Cp2ZrCl 2 groups. A dinuclear complex with a bridging bisfluorenyl ligand, (CpZrCl2)2(mu-eta5,eta5-C 13H8CH2CH=CHCH2C13H 8), is also obtained from the metathesis of a mononuclear Zr complex with the allylfluorenyl ligand. X-ray crystallography of (CpZrCl 2)2(mu-eta5,eta5-C 13H8CH2CH=CHCH2C13H 8) revealed the molecular structure with a trans-C=C double bond and the two Zr centers situated at different sides of the bridging bisfluorenyl ligand. Cross metathesis reaction of CpZrCl2{eta5-C 5H4(CH2)2CH=CH2} and ferrocenylmethyl acrylate produces the Zr/Fe dinuclear complex CpZrCl 2{mu-eta5,eta5-C5H 4(CH2)2-CH=CHCOOCH2C 5H4}FeCp. The dinuclear complexes catalyze polymerization of ethylene and propylene in the presence of MAO (methylaluminoxane). The activity of the Zr/Zr dinuclear complexes for ethylene polymerization is higher than that of the mononuclear precursors. The length and flexibility of the bridging group of the biscyclopentadienyl ligand also influence the catalytic activity.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

Chemical engineers ensure the efficiency and safety of chemical processes, adapt the chemical make-up of products to meet environmental or economic needs, and apply new technologies to improve existing processes. Recommanded Product: Vinylferrocene. Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. Introducing a new discovery about 1271-51-8, Name is Vinylferrocene

A cesium fluoride-promoted reductive coupling reaction of acylferrocene tosylhydrazones with arylboronic acids has been developed, producing highly substituted alpha-arylalkylferrocenes in moderate to excellent yields. The reaction employs anionic fluorine to facilitate the cleavage of C?B bond. The developed methodology demonstrates a wide substrate scope and high functional groups tolerance. Moreover, the alpha-arylalkylferrocenes compounds were also obtained on a multi-gram scale.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Suitably blocked carbohydrates containing free thio 4, amino 5, and hydroxyl 10,19 nucleophilic functionalities have been treated with (a) ferrocenecarbonyl chlorides 2 and 3. (b) N,N-dimethylaminomethylferrocene methiodide 12, and (c) ferrocenyl tosylate 16 to form the ferrocenyl sugar derivatives 6,7,8,9,11,13,14,15 and 20.Direct conjugation of a free, water-soluble sugar to ferrocene was achieved by the formation of a Schiff’s base between glucosamine hydrochloride 25 and ferrocene carboxaldehyde 24.The synthesis of ferrocenyl sugars using bridging group technology is exemplified by the conjugation of the thio sugar 4 to ferrocene via the versatile coupling reagent cyanuric chloride 21 to form the s-triazine compound 23.These products have been studied by 1H nmr spectroscopy: chemical shifts, coupling constants, and proton spin-lattice relaxation measurements.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

Chemistry involves the study of all things chemical – chemical processes, Synthetic Route of 1273-86-5, chemical compositions and chemical manipulation – in order to better understand the way in which materials are structured, how they change and how they react in certain situations. In a patent，Which mentioned a new discovery about 1273-86-5

We investigate the Faradaic currents of ferrocene species at an electrode-membrane-electrode system. The membrane electrodes system is fabricated by physical sputtering of conductive metal on both sides of a nanoporous alumina membrane. The metal coatings function as working electrodes by connection to a bipotentiostat and reference/counter electrodes in the sample solution. Collection and shielding efficiency studies are carried out at this membrane electrodes system to measure mobility values of charged ferrocene species within nanochannels of alumina membrane. Results indicated high selective electrode response of up to 16 times for positively charged (dimethylaminomethyl)ferrocene (FcN), and neutral ferrocenemethanol (FcMeOH), compared to the negatively charged ferrocenecarboxylic acid (FcCOOH) when the receiver electrode was maintained at negative potentials of 0.5-1.0 V relative to the feed electrode. This is a report on the use of an electrode-membrane-electrode system to achieve selective response towards differently charged redox species, under the condition of high electrolyte concentration (0.1 M, pH 7.0 phosphate buffer).

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Matrix materials, such as sol-gels and polymers derivatives to contain a redox active material can be used to form electrodes and probes suitable for use in pH meters and other analyte sensing devices.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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The synthesis and solution redox properties of several covalently attached ferrocene and tetrathiafulvalene units are reported, together with the X-ray crystal structure of a 1,1′-bis(1,3-dithiole-2-ylidene)-substituted ferrocene derivative.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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The Wittig reaction has been identified as a viable route to transition metal monomers.It has been used to synthesize (eta5-C5>Mn(CO)3 from acetylcymantrene and the appropriate phosphorane at room temperature. >(eta5-C5H5)Fe (eta5-C5H5)Fe have been produced from formylferrocene and phosphorane in refluxing benzene.E/Z isomeric ratios were identified for alkenylcymantrenes and are consistent with past Wittig studies.The aldol reaction has been identified as a side route in the Wittig reactions of acetylferrocene and phosphoranes.Carbomethoxyphosphoranes did not produce alkenes at room temperature with nonpolar solvents.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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The new family of Ruthenium(II)-arene complexes of lidocaine of formula [RuII(eta6-p-cymene)Cl(LC)](PF6), 1, [RuII(eta6-p-cymene) (C[tbnd]CFc) (LC)](PF6), 2, [RuII(eta6-p-cymene) (C[tbnd]CFcIP) (LC)](PF6), 3 (LC: lidocaine, FcC[tbnd]CH: ferrocenyl acetylene, C[tbnd]CFcIP: 1?-(phenanthro[9,10-d]imidazole) ferrocenyl-1-acetylene) were prepared and characterized by ESI-MS spectrometry, elemental analysis, IR,1H and13C NMR spectroscopy. The photocytotoxicity of 1?3 was studied with visible light (400?700 nm) against a panel of human cancer cell lines namely, A-375 (human melanoma), HeLa (human cervical cancer) and MCF-7 (human breast cancer) cancer cells. The photoactivity follows the order 1 < 2 < 3 with 2 and 3 having IC50values in A-375 (melanoma) cells in the low micromolar range. These complexes interact with calf thymus DNA. The photocleaving pUC19 DNA of complexes with visible light (400?700 nm) was studied and the results exhibited the active involvement of superoxide and hydroxyl radicals as the reactive oxygen species (ROS) in the DNA photocleavage reactions. These complexes interact with calf thymus DNA via intercalative mode that binding constants vary in the order: 3 > 2 > 1. The complexes 2 and 3 were photoactivated in A-375 cells by visible radiation and analyzed by alkaline single-cell gel electrophoresis.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

Chemical engineers ensure the efficiency and safety of chemical processes, adapt the chemical make-up of products to meet environmental or economic needs, and apply new technologies to improve existing processes. Product Details of 1271-48-3. Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. Introducing a new discovery about 1271-48-3, Name is 1,1′-Ferrocenedicarboxaldehyde

A number of ether- and thioether-substituted ferrocenes (1,1?-bis(1,3-dioxane-2-yl)ferrocene 1, 1,1?-bis(5-methyl-1,3- dioxane-2-yl)ferrocene 2, 1,1?-bis(4-methyl-1,3-dioxane-2-yl)ferrocene 3, 1,1?-bis[(R)-(-)-4-methyl-1,3-dioxane-2-yl]ferrocene 4, 1,1?-bis(4,6-dimethyl-1,3-dioxane-2-yl)ferrocene 5, and 1,1?-bis(1,3-dithiane-2-yl)ferrocene 6) were synthesised by direct condensation of 1,1?-diformylferrocene with the corresponding diols or dithiols. The crystal structures of 1, 5a, 5b, and 6 were determined by X-ray diffraction studies. Electrospray ionisation mass spectrometry was used to investigate the binding behaviour of 1 and 6 toward alkali as well as transition metal cations. The dioxane-containing species 1 showed high affinity toward Li+ and Na+, whereas the dithiane derivative 6 bound, as expected, preferentially to Hg2+. The Royal Society of Chemistry 2003.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion