Iron catalyst

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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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Diaphorase (DI) works as an effective catalyst for the electrochemical oxidation and reduction of NAD with the aid of several quinones or flavins as electron transfer mediators. The redox kinetics between DI and mediators have been expressed by a Butler-Volmer-type equation. NAD-dependent L-lactate dehydrogenase (LDH) catalyzing the redox reaction between L-lactate and pyruvate was coupled to the DI-catalyzed NAD redox system to achieve better understanding of mediated two-enzyme-linked bioelectrocatalysis with reversible characteristics. Under the conditions where the concentration polarization of NAD due to the DI-catalyzed electrochemical reaction is suppressed by the LDH reaction, the NAD concentration dependence of the catalytic current was expressed by an approximate equation involving the enzyme kinetics between DI and NAD. The suppression of the NAD concentration polarization is also useful to observe steady-state catalytic waves of an uphill reaction between DI and the mediator. The oxidation reaction involving the uphill electron transfer from L-lactate to NAD+ is susceptible to a inhibition from pyruvate due to the reversible characteristics of LDH. The present knowledge has led to the strategy to realize a two-way bioelectrocatalysis for the reduction of pyruvate and the oxidation of L-lactate. New potentiometry for the detection of the solution potential governed by the electrochemically inactive pyruvate/L-lactate redox couple has also been demonstrated based on the reversible characteristics of the DI-DLH-linked bioelectrocatalytic system.

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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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In recent years, redox flow batteries (RFBs) and derivatives have attracted wide attention from academia to the industrial world because of their ability to accelerate large-grid energy storage. Although vanadium-based RFBs are commercially available, they possess a low energy and power density, which might limit their use on an industrial scale. Therefore, there is scope to improve the performance of RFBs, and this is still an open field for research and development. Herein, a combination between a conventional Li-ion battery and a redox flow battery results in a significant improvement in terms of energy and power density alongside better safety and lower cost. Currently, Li-ion redox flow batteries are becoming a well-established subdomain in the field of flow batteries. Accordingly, the design of novel redox mediators with controllable physical chemical characteristics is crucial for the application of this technology to industrial applications. This Review summarizes the recent works devoted to the development of novel redox mediators in Li-ion redox flow batteries.

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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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Titan, the largest satellite of Saturn, is a key planetary body for astrobiological studies due to its active organic chemistry, hydrocarbon lakes and possible subsurface water-ammonia liquids. We have investigated the physicochemical properties of organic compounds synthesized in a simulated Titan atmosphere. A laboratory analog of Titans aerosols, called tholin, was produced by irradiation of a nitrogen/methane gas mixture. The primary aim was to determine whether tholin represent possible sources of surface-active substances that could have been involved in the formation of prebiotic structures. A tholin sample was extracted with chloroform-methanol and the chloroform soluble material was separated by two-dimensional thin layer chromatography. Fluorescence excited by UV light was used to identify the major components on the plates. After being scraped from the TLC plate, the components were eluted as specific fractions and investigated by surface chemical methods, FTIR, scanning electron microscopy and cyclic voltammetry. Fractions 1 and 2 were strongly fluorescent and surface active, producing films at air-water interfaces. When exposed to aqueous phases, components in fraction 1 form spherical microstructures resembling prebionts. The prebionts are precursor structures that might have evolved into the first living cells.

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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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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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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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A bis(phosphine)borane ambiphilic ligand, [Fe(h5-C5H4PPh2)(h5-C5H4PtBu{C6H4 (BPh2)-ortho})] (FcPPB), in which the borane occupies a terminal position, was prepared. Reaction of FcPPB with tris(norbornene)platinum(0) provided [Pt(FcPPB)] (1) in which the arylborane is h3BCC-coordinated. Subsequent reaction with CO and CNXyl (Xyl=2,6-dimethylphenyl) afforded [PtL(FcPPB)] {L=CO (2) and CNXyl (3)} featuring h2BC-And h1B-Arylborane coordination modes, respectively. Reaction of 1 or 2 with H2 yielded [PtH(m-H)(FcPPB)] in which the borane is bound to a hydride ligand on platinum. Addition of PhC2H to [Pt(FcPPB)] afforded [Pt(C2Ph)(m-H)(FcPPB)] (5), which rapidly converted to [Pt(FcPPB’)] (6; FcPPB’=[Fe(h5-C5H4PPh2)(h5- C5H4PtBu{C6H4 (BPh-CPh=CHPh-Z)-ortho}]) in which the newly formed vinylborane is h3BCC-coordinated. Unlike arylborane complex 1, vinylborane complex 6 does not react with CO, CNXyl, H2 or HC2Ph at room temperature.

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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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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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A cyclometalated iridium(III) complex containing a N?C?N-coordinating terdentate ligand [Ir(dpyx-N,C,N)Cl(mu-Cl)]2 was found to be a general and highly effective catalyst for the alpha-alkylation of ketones and N-alkylation of amines with alcohols. In the presence of catalyst (1 mol % Ir) and base (0.2-0.5 equiv), a variety of desirable products were obtained in good yields under an air atmosphere. Notably, this research exhibited the new potential of Ir(III) complexes bearing non-Cp? ligand and will facilitate the progress of the hydrogen autotransfer process.

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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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A number of organometallic stilbenes of the general type [Co(eta4-C4Ph4)(eta5-C 5H4CHCHR] are reported where R is C6H 4X-4 (X = H, OMe, Br, NO2), 1-naphthyl, 9-anthryl, 1-pyrenyl, (eta5-C5H4)Co(eta4- C4Ph4), and (eta5-C5H 4)Fe(eta5-C5H4Y) {Y = CHO, CHC(CN)2 and CHCHC5H4-eta5) Co(eta4-C4Ph4)}. They were prepared by Wittig or Horner-Wadsworth-Emmons reactions which yield both E and Z or only E products respectively. The isomers were separated and all compounds characterised by standard spectroscopic techniques as well as by X-ray diffraction methods in many cases. The electrochemistry of the stilbene analogues in dichloromethane solution is also reported. In most, the (eta5-C5H4)Co(eta4-C 4Ph4) functional group undergoes a reversible one-electron oxidation. For those molecules that also include (eta5-C 5H4)Fe(eta5-C5H4Y), this is preceded by the reversible oxidation of the ferrocenyl group. Spectroscopic and structural data suggests that for most compounds there is little electronic interaction between Co(eta4-C4Ph 4)(eta5-C5H4) and the R end groups which are effectively independent of one another. The only exceptions to this are Z and E-[Co(eta4-C4Ph4) (eta5-C5H4CHCHC6H 4NO2-4], and [Co(eta4-C4Ph 4)(eta5-C5H4CHCHC 5H4-eta5)Fe{eta5-C 5H4CHC(CN)2}] where the electronic spectra are respectively consistent with a significant Co(eta4-C 4Ph4)(eta5-C5H4)/ NO2 donor/acceptor interaction and a less significant Co(eta4-C4Ph4)(eta5-C 5H4)/C(CN)2 one. However, OTTLE studies show that in the electronic spectra of [Co(eta4-C4Ph 4)(eta5-C5H4CHCHR]+ there are low energy absorption bands (950-1800 nm) which are attributed to R ? Co(eta4-C4Ph4)(eta5- C5H4)+ or, when R is a ferrocenyl-base group, Co(eta4-C4Ph4)(eta5-C 5H4) ? (eta5-C5H 4)Fe(eta5-C5H4Y)+ charge transfer transitions. The ferrocenyl compounds undergo cis/trans isomerisation on the OTTLE experiment timescale.

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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