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[3]Ferrocenophanone rac-8 was prepared by several non-Friedel-Crafts pathways starting from a Mannich-type coupling of 1,1?-diacetylferrocene followed by catalytic hydrogenation. Hydride abstraction from the resulting alpha-dimethylamino[3]ferrocenophane rac-14 with B(C6F 5)3 followed by hydrolysis gave the ketone rac-8. Several variants of the Sommelet reaction, using ethylglyoxylate, formaldehyde or hexamethylenetetramine (urotropine) as the “oxidizing” reagent gave the alpha-[3]ferrocenophanone 8 in good to excellent yield. Some variants of these reactions were also used for the preparation of the pure enantiomer (R)-8. The electrochemical behaviour of 8 has been investigated and compared with related derivatives. The Royal Society of Chemistry 2006.

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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 SYMMETRIC 1,1′-disubstituted ferrocene- derived Schiff-bases have been prepared and used as ligands in the preparation of their novel Pd(II) and Pt(IV) metal chelates. The synthesized ligands and their metal chelates have been characterized by their physical, analytical and spectral data. These have also been used for screening against B. subtilis, S. aureus, E. coli, S. typhi (bacteria), C. albicans (yeast), A. niger and F. solani (fungi). The antimicrobial results indicated that the complexes prepared are more active than the ligand and have been found to be a novel class of organometallic-based antimicrobials.

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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. Quality Control of 1,1′-Diacetylferrocene. Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. Introducing a new discovery about 1273-94-5, Name is 1,1′-Diacetylferrocene

A series of liquid-crystalline ferrocene derivatives, Fe2 (X = H, OH; n = 3 to 12), were obtained by the condensation of 1,1′-bishydrazondiacetylferrocene with p-alkoxybenzoyloxybenzaldehydes.According to DSC and polythermic microscopy, all of the compounds exhibit an enantiotropic nematic mesophase in the 150-230 deg C temperature range.A polycrystalline transition precedes the nematic transition.The liquid crystalline properties of the obtained compounds were investigated with respect to the number of carbon atoms in the terminal alkyl chain and the terminal hydroxy group.The composition and structure of the obtained compounds were determined by elemental analysis and IR and NMR spectroscopy. – Key words: liquid crystals; ferrocene; metallomesogenes.

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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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We show here that the disubstituted ferrocenyl chalcones 1 and 2 are good electrochemical sensors for calcium and barium in CH3CN. However, these two triflate salts are detected in a different way by both ligands. To clarify this point, a thorough and informative NMR study of the ligand-salt interactions is presented. The unusual shapes of the titration curves obtained depend on both the ligand and cation used. For example, they illustrate that ligand 1 mainly interacts with the metal by its CO functions, while ligand 2 also interacts by its azacrown groups. These curves also reflect complex equilibriums in solution involving several ligand-salt adducts detected by mass spectrometry. To evaluate the strength of these interactions, the association constants of all the species formed have been determined by fitting the NMR data. It is noteworthy that changing the diethylamino groups in molecule 1 by the azacrown residue enhances the selectivity for the calcium salt, as pointed out by the value of the association constant of the 2Ca2+ species. The synthesis of the protonated counterparts 3 and 4 was useful to clarify the electrochemical behaviour of 1 and 2. Although the two ligand-salt interactions present several common points, the whole results obtained allow us to propose an original explanation for the difference observed between the Ca2+ and Ba2+ electrochemical sensing.

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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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Standard peptide coupling reactions were use to prepare the N-(ferrocenyl)2 and N-(ferrocenoyl)2 cystine dimethyl ester derivatives 4-11. The ferrocene carboxylic acids 1 and 3 were treated with 1-hydroxybenzotriazole (HOBt), N-(3-dimethylaminopropyl)-N?- ethylcarbodiimide hydrochloride (EDC), l-cystine methyl ester hydrochloride and triethylamine in dichloromethane at 0 C to furnish compounds 4-9. The preparation of compounds 10 and 11 employed the dipeptide derivatives (glycine)2-l-cystine dimethyl ester and (beta-alanine) 2-l-cystine dimethyl ester respectively. The N-(ferrocenyl) 2 and N-(ferrocenoyl)2 cystine dimethyl ester derivatives 4-11, which are potential anion sensing agents, were spectroscopically characterized by a combination of 1H NMR, 13C NMR, IR, UV, DEPT-135 and 1H-13C COSY (HMQC) spectroscopy, mass spectrometry and cyclic voltammetry. The electrochemical detection of dihydrogen phosphate and adenosine nucleotide anions in aqueous electrolyte by monolayers of {N-(ferrocenoyl)-beta-alanine}2-l-cystine dimethyl ester 11 immobilized on gold electrodes using cyclic voltammetry is described. Immobilization of this receptor on a gold electrode surface enabled the recognition process to be detected in aqueous media. The recognition process is as a result of electrostatic interactions between the ferricenium cation and the anion, and hydrogen bonding interactions between the peptide amide bonds and the anion. The complexation process was amperometrically sensed via a reduction in the peak current of the ferrocene/ferricenium redox couple. A linear relationship (R2 = c. 0.99) was observed between anion concentration and change in peak current in both cases.

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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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New azaalkyl or azacrown ferrocenyl compounds containing a C5H4COCC- linkage are accessible from mono- or diacetylferrocene upon treatment with the appropriate aldehydes (CHOC6H4-p-R, R = NEt2, N-aza-15-crown-5). Preliminary results concerning the electrochemical behaviour of complexes [(C5H5)Fe(C5H4COCH=CHC6H4NEt2)] (3a), [Fe(C5H4COCH=CHC6H4NEt2)2] (5a), the novel ferrocenophane [Fe(C5H4COCH2)2CHC6H4NEt2] (6a) and its protonated species [Fe(C5H4COCH2)2CHC6H4NHEt2][BF4] (7a), are reported. The ferrocenyl ligand 5a is a rare example of a molecule which is both electroactive and fluorescent.

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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 28 mono and disubstituted ferrocenes with a natural abundance of 57Fe have been measured relative to internal ferrocene.Most of the resonances appear at the high frequency side.The shielding influence of the various substituents is discussed qualitatively. 57Fe shifts are very sensitive to ring tilting as occurring in <3>ferrocenophanes. – Keywords: 57Fe Shifts; Hybridization influence on chemical shifts; Ring tilting

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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 conformation flexible chemosensor for selective detection of Hg2+ in aqueous media was achieved by incorporating two well-known rhodamine-6G dyes and a ferrocene group within one molecule. Distinguished from the monosubstituted ferrocene derivative which is previously reported a lack of interaction with Hg2+, the title compound was characteristic of two-armed bidendate binding unit. The Hg2+ sensing behavior can be switched via the conformation flexibility. The 1:1 sensor/Hg2+ binding mode was proposed and supported by the titration experiment and ESI mass spectrum. The fluorescent sensor can display a highly selective response of fluorescence enhancement toward Hg2+ and detect the parts per billion (ppb) level of Hg2+ in aqueous environment. Crown Copyright

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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 [(Me2CC5H4)2M]2+ and [(Me(H)CC5H4)2M]2+ dications (M = Ru, Os) were generated and their precursors, dicarbinols, were synthesized. 1H NMR spectral analysis showed that the former dications have a dicarbocation structure. For the [(Me(H)CC5H4)2M]2+ dications, the energies of both the onium and dicarbocation structures are close, and compounds of both types can be simultaneously observed in solution.

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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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<3.3>(1,1′)Ruthenocenophane-2,14-diene-1,16-dione, <5.5>(1,1′)ruthenocenophane-2,14,17,29-tetraene-1,16-dione and their ferrocenoruthenocenophane homologs were synthesized by using an intramolecular base-catalyzed condensation.

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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