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Droplet-based microfluidics has emerged as a powerful platform for high-throughput and low-volume analysis and screening. At present, droplet-based microfluidics is transitioning from the proof-of-concept stage to real-world applications. During this process, analytical detection techniques play indispensable roles for successfully implementing droplet-based chemical or biological assays. In this review, we provide an overview of recent developments in analytical techniques for droplet analysis and elucidate the advantages and limitations of each technique. We cover the majority of technology categories, including optical detection, electrical detection, mass spectrometry, and nuclear magnetic resonance spectroscopy. Additionally, we highlight new research areas that have been enabled by these technical advances. Finally, we provide perspectives on both future technological directions and potential enabling applications.

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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 invention discloses a carbamate compounds containing ferrocene group and its synthesis method, which belongs to the field of high molecular. The invention also discloses a containing ferrocene group of the carbamate compound preparation method. The invention containing ferrocene group a carbamate compound, chemical quality good stability, has a plurality of catalytic characteristics; for lubricating oil additive, at the same time has good oxidation resistance, abrasion resistance and corrosion resistance; for fuel oil additive, with smoke combustion-supporting, the advantages of reducing pollution. (by machine translation)

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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 water-soluble iridium complex {Cp*[6,6′-(OH)2bpy] (H2O)}[OTf]2 (Cp=nu5-pentamethylcyclopentadienyl, bpy=2,2′-bipyridine) was found to be a general and highly efficient catalyst for the Nalkylation of the poor nucleophilic sulfonamides with alcohols as alkylating agents in water. The presence of OH units in the bpy ligand is crucially important for the catalytic activity of the iridium complex. Mechanistic investigations revealed that the catalytically active species is a ligand-metal bifunctional iridium complex bearing an N,N’-chelated 2,2′-bipyridinated ligand and an aqua ligand. Notably, the present catalytic system and the proposed mechanism provide a new horizon and scope for the development of “hydrogen autotransfer (or hydrogen-borrowing) processes”.

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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 structures, electrochemical properties, enantiomeric separation of ferrocenyl (alkyl)pyrimidines and ferrocenyl(ethyl)adenine and their effects on the DNA synthesis in tumor cells were studied. Enantiomeric mixtures were separated by HPLC on modified cellu lose as the chiral selector. The electrochemical properties of compounds were studied by cyclic voltammetry. All compounds have reversible singleelectron redox transition in the region of 0.52-0.60 V, which belongs to ferrocene-ferrocenium with a positive shift compared to ferrocene (0.52 V). The molecular structure of 1N (ferrocenylbenzyl)5iodocytosine was studied by X-ray diffraction. 1-N (Ferrocenylethyl)adenine was studied for ability to inhibit the DNA synthesis in the human ovarian cancer cell culture by the 3H thymidine test.

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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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Regioselectivity of the HBF4-catalyzed ferrocenylalkylation of 2-mercaptobenzoxazole in two phase aqueous organic solvent mixture was studied. The reaction proceeds regioselectively at the heterocyclic nitrogen atom. Structures of the synthesized compounds were established by 2D NMR technique. Structure of 3-(1-ferrocenylbenzyl)benz[d]oxazol-2-thione was elucidated by X-ray diffraction.

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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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ABSTRACT The ferrocene-containing ?-diketone, 3-ferrocenylmethyl-pentane-2, 4-dione 1, has been synthesized by reacting ferrocenyl methanol with acetylacetone in the presence of cerium(IV) ammonium nitrate as catalyst in C-C bond formation, and isolated as an orange oily product in 90% yield. The doubly-substituted 1,3-diketone, 3,3′-bis(ferrocenylmethyl)pentane-2,4-dione 2 was isolated as orange crystals in 79% yield, upon standing a dichloromethane solution of 1 at -30 C for two weeks. Both complexes have been authenticated by spectroscopic methods, mass spectrometry, and cyclic voltammetry. In addition, the molecular identity and geometry of 2 has been confirmed by single-crystal X-ray diffraction analysis. In the crystal lattice, the molecules pack as dimers through C-HO hydrogen bondings, where weaker C-Hp interactions link the dimeric units to form a chain structure.

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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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By combining different allotropic forms of carbon at the nanoscale it is possible to fabricate tailor made surfaces with unique properties. These novel materials have shown high potential especially in the electrochemical detection of different biomolecules, such as dopamine, glutamate and ascorbic acid, which are important neurotransmitters in the mammalian central nervous system. Thus, more information about their material properties must be obtained in order to realize their high potential to the maximum. The results presented in this review clearly point out that although there is an extensive amount of data available on the structural, chemical and electrochemical properties on different carbon nanoforms, the data are scattered, often inconsistent and even contradictory. Hybrid carbon nanomaterials are much less investigated than the individual allotropes, but based on the existing data they possess extremely interesting electrochemical properties. Thus, it is of utmost importance to carry out extensive step-by-step characterization of these materials by utilizing combination of detailed computational and experimental work. In this way it will become possible to avoid approaches to material design that are based solely on trial-and-error approach, which has, unfortunately, been more a rule than an exception.

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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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Chemical visualization of corrosion processes using scanning electrochemical microscopy (SECM) in combined amperometric/potentiometric operation has been achieved by developing novel multi-barrel probes as tips. A Pt-based amperometric disc probe is employed for the detection and characterization of reactive sites on a corroding system, whereas a Sb-based disc microelectrode is employed to visualize local solution pH changes. Quasi-simultaneous imaging of localized corrosion micro-cells on the surface and the associated pH variations in the electrolyte, resulting from both the electrolysis of dissolved metal ions from the local anodes and the consumption of an oxidizing agent at the local cathodes, can be obtained in the same solution without changing the probe. Galvanic corrosion of a model Cu-Fe pair in chloride-containing solution was visualized with high spatial resolution by recording either line scans or 2D-images using the novel Pt/Sb multi-barrel tip.

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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 preparation of 1-ferrocenyl-2-propanol (5) from lithioferrocene and propylene oxide is described. The reaction of lithium diisopropylamide with 2-ferrocenylethanol (3) or 1-ferrocenyl-2-propanol (5), followed by the addition to hexachlorocyclotriphosphazane (1) provides N3P3Cl6-n (OCHRCH2C5H4FeCp)n [R=H, n=1 (3) or 2 (4); R=CH3, n=1 (6)]. The corresponding reactions with ferrocenylmethanol lead to degradation products via a phosphazene-phosphazene rearrangement. The substitution pattern observed for N3P3C14(OCH2CH2C5H4FeCp)2 (4) suggests that the reaction follows a predominantly cis-non-geminal pathway. The substituted phosphazene derivatives were characterized by standard means including 31P-NMR, mass spectrometry, elemental analysis and cyclic voltammetry. An X-ray crystal structure of N3P3C15(OCH2CH2C5H4FeCp) (3) was obtained.

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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 invention discloses a carbon material of the load of the ruthenium particles preparation and catalytic applications. Specifically, the present invention preparation of ruthenium particles having an average particle size distribution in the 2.2 nm the left and the right, its uniformly dispersed in the carbon material on the substrate. The material can be catalyzed transfer reaction to aromatic methanol and aromatic amine as the raw material synthetic secondary amine, has high conversion efficiency, wide application range, mild reaction conditions and the like. After the end of the conversion reaction, from the reaction system in the centrifugal separating out catalyst, by simple washing and drying can be carried out by the next round of reaction, circulation 5 times can still be kept stable and its catalytic activity did not experience any is obviously reduced. (by machine translation)

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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