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Closely spaced 0.2-1 num, Au microelectrodes (50 num long, 1-2 num wide, and 0.1 num thick) on Si3N4 can be functionalized with poly (viniylferrocene), PVFc +/0, or with an N,N’-dibenzyl-4,4′-bipyridinium-based polymer, (BPQ2+/+)n’ derived from hydrolysis of N,N’-bis<(p-trimethoxysilyl)benzyl>-4,4′-bipyridinium (I).Two- or eight-microelectrode arrays have been functionalized with PVFc+/0 or (BPQ2+/+)n.Adjacent microelectrodes can be connected with either polymer in the sense that net current can pass from one microelectrode to another, through the polymer,when one electrode is held at a potential where the polymer is oxidized and the other electrode is held at a potential where the polymer is reduced.From such steady-state current an estimate of the diffusion coefficient for charge transport, DCT, in the polymer can be made; values in the range 10-9 – 10-10 cm2/s are found and accord well with earlier measurements of DCT for the polymers studied.A two-terminal diode can be fabricated by coating one electrode with (BPQ2+/+)n and an adjacent electrode with PVFc+/0 such that there is a connection between the microelectrodes via the (BPQ2+/+)n/PVFc+/0 contact.Current passes when the applied potential is such that the negative lead is attached to the (BPQ2+/+)n-coated electrode and the positive lead is attached to the PVFc+/0-coated electrode.When the applied potential approaches the difference in the Eo’s of the two polymers, current flows with the crucial feature being a downhill (by ca. 0.9 V) cross redox at the (BPQ2+/+)n/PVFc+/0) interface, BPQ+ + Fc+ –> BPQ2+ +Fc0.Current does not flow between the microelectrodes when the applied is in the opposite sense, because the reaction BPQ2+ + Fco –> BPQ+ + Fc+ is uphill by ca. 0.9 V.The switching time of a microelectrochemical diode is controlled by the time required to oxidize and reduce the polymers.

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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

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Vicinal diamines are a common structural motif in bioactive natural products, therapeutic agents, and molecular catalysts, motivating the continuing development of efficient, selective, and sustainable technologies for their preparation. We report an operationally simple and environmentally friendly protocol that converts alkenes and sodium azide?both readily available feedstocks?to 1,2-diazides. Powered by electricity and catalyzed by Earth-abundant manganese, this transformation proceeds under mild conditions and exhibits exceptional substrate generality and functional group compatibility. Using standard protocols, the resultant 1,2-diazides can be smoothly reduced to vicinal diamines in a single step, with high chemoselectivity. Mechanistic studies are consistent with metal-mediated azidyl radical transfer as the predominant pathway, enabling dual carbon-nitrogen bond formation.

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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

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Reactions of Cp2TiMe2, with the ester derivatives of organometallic sandwich compounds (n5-RC5H4)Fe(n5-C5H5) and (n5-RC5H4)Co(n4-C4Ph4) (R=ester groups) gave products having R=C(CH2)Me, instead of the expected vinyl ethers indicating conversion of the ester units by Cp2TiMe2 to methyl ketones followed by methylenation. A reaction of Cp2TiMe2 with the diester (n5-RC5H4)Co(n4-C4Ph3R)(R=C(O)OMe) also gave similar results. The study has also been successfully extended to metal sandwich derived amides, thio and seleno esters. By controlling the amount of Cp2TiMe2, the reactions were also stopped at the methyl ketone stage and the methyl ketones were isolated in good yields and characterized. The method provides an easy and direct access to convert organometallic sandwich derived esters and related compounds to 1-methylvinyl derived products.

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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

Chemical engineers work across a number of sectors, processes differ within each of these areas, but chemistry and chemical engineering roles are found throughout, creation and manufacturing process of chemical products and materials. Related Products of 1271-51-8. 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

The treatment of pinacolborane (4,4,5,5-tetramethyl-1,3,2- dioxaborolane) with vinylarenes in the presence of a catalytic amount of phosphine-free di-mu-chlorobis(1,5- cyclooctadiene)dirhodium(I) [RhCl(cod)]2, through dehydrogenative borylation, provides the corresponding regio- and stereodefined (E)-2-arylethenylboronates in high yields. Also, a ruthenium complex prepared in situ from (1,5-cyclooctadiene)(1,3,5-cyclooctatriene)ruthenium(O) [Ru(cod)(cot)] and P(4CF3C6H4)3 showed considerable catalytic activity for dehydrogenative borylation.

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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

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. Application of 1271-51-8. 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 series of donor-acceptor ferrocenyl substituted bisthiazoles 3-8 were designed and synthesized by the Pd-catalyzed Suzuki, Heck, and Sonogashira cross-coupling reactions. Their photophysical, electrochemical and computational studies reveal strong donor-acceptor interactions. The photonic and electrochemical studies show that the ferrocenyl bisthiazoles with vinyl linkage ferrocenyl-bisthiazole 4, show better electronic communication compared to rest of the ferrocenyl bisthiazoles. The time dependent density functional theory (TD-DFT) calculation at B3LYP on the ferrocenyl substituted bisthiazoles 3-5 was performed, in which the ferrocenyl-bisthiazole 4 shows strong donor-acceptor interactions compared to the Fc-bisthiazoles 3 and 5. The thermal stability of the ferrocenyl substituted bisthiazoles 3-8 is reported, in which Fc-bisthiazole 8 shows high thermal stability. The single crystal structures of ferrocenyl-bisthiazoles 3 and 5 are reported.

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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

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57Fe NMR spectra of 20 ferrocene derivatives with natural abundance of 57Fe have been recorded by the conventional pulse Fourier transform technique using ferrocene as internal standard for the chemical shifts.Shift contributions of the substituents are discussed qualitatively.

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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

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Ferrocene and ferrocenium sites in radiofrequency plasma polymer films on Pt electrodes can be electrochemically oxidized and re-reduced in contact with a variety of electrolyte/solvent systems.When the electrochemical reaction is conducted under near-equilibrium conditions, cyclic voltammetric and chronopotentiometric waveshapes reflect the modulation of ferrocene and ferrocenium site activities by solvent swelling of the film.In water, ferrocene sites exhibit a phase-like (constant) activity during film oxidation, but in acetonitrile ferrocene site activity is proportional to fractional film oxidation.When the film oxidation or reduction is driven by a large potential step (avoiding film ohmic resistance effects), the rate of film reaction is controlled by Fickian diffusion of electrochemical charge through the film.In water, the product of charge diffusion constant and initial concentration of electroactive sites, D1/2C, is 2 X 10-8 mol/cm2 s1/2 for film oxidation and 1.4 X 10-8 mol/cm2 s1/2 for film re-reduction.The difference may be due greater film swelling in the oxidized state.The relationship of charge diffusion rates in redox polymer films on electrodes to their electrocatalytic reactions is discussed.

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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

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Ethenylferrocene, C12H12Fe, was an unexpected product of the thermolysis of 1-aminoethylferrocene in a melt reaction with naphthalene-2,3-dicarboxylic acid. It was characterized by single crystal X-ray diffraction which revealed that the cyclopentadiene rings are slightly staggered and the ethenyl substituent lies approximately in the plane of the substituted cyclopentadiene ring. In the crystal structure C-H?pi interactions link molecules into parallel rows.

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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 in situ reduction of ferrocenyl cyclopropylimines to the corresponding amines triggers a facile oxidative ring-opening to yield the formal four-electron oxidation products: N-ferrocenylmethyl beta-hydroxyamides. This process is believed to proceed via generation of a ferrocinium ion in the presence of air, leading to facile formation of a distonic radical cation that is ultimately trapped by oxygen.

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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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A nickel(0)-catalyzed hydroalkenylation of imines with styrene and its derivatives is described. A wide range of aromatic and aliphatic imines directly coupled with styrene and its derivatives, thus providing various synthetically useful allylic amines with up to 95 % yield. The reaction offers a new atom- and step-economical approach to allylic amines by using alkenes instead of alkenyl-metallic reagents. Experiments and DFT calculations showed that TsNH2 promotes the proton transfer from the coordinated olefin to the imine, accompanied by a new C?C bond formation.

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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