Showing papers on "Ferrocene published in 1983"

The discovery of ferrocene, the first sandwich compound

Abstract: A serendipitous discovery in 1951 opens an entire new area of research and contributed greatly to the technological contributions of chemistry.

Process for the synthesis of ethanol and acetaldehyde using cobalt compounds with novel promoters

Abstract: Ethanol and/or acetaldehyde are prepared in good yield by contacting methanol, hydrogen and carbon monoxide with a catalyst system comprising a cobalt-containing compound and a promoter in the presence of an inert oxygenated solvent at a temperature of from about 50° C. to about 350° C. and a pressure of at least 500 psig or greater. The combination of cobalt-containing compound and promoter may be (a) a cobalt-containing compound with an organo-sulphur compound, (b) an iodide-containing cobalt compound with a nitrogen-containing compound as promoter, and (c) a cobalt-containing compound with 1,1'-bis(diphenylphosphino)ferrocene.

[103RU]‐markierte ruthenocen‐der ivate biogener amine

Abstract: The ruthenocene derivatives of different biogenic amines labelled with 103RU in the ruthenocene moity were synthesized. In a first step the central atom of ferrocene was exchanged with 103RuCl3 yielding [103RU]-ruthenocene, by vilsmeier-formylation the radioactive ruthenocene aldehyde was synthesized which was condensed with the desired amine to the Schiff'sche base, followed by the reduction of the CN double bond by NaBH4.

Ferrocene derivatives, part 67 57 Fe-NMR spectroscopy of ferrocenes

Abstract: 57Fe NMR-spectra of 28 mono and disubstituted ferrocenes with a natural abundance of57Fe 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.

Properties of Chemically Derivatized Nickel Electrodes: The Synthesis of an Electrocatalytic Interface

Abstract: Nickel electrodes yield poor charge transfer characteristics for the oxidation and reduction of the ferrocene couple, as well as for a number of other electrochemically interesting reactions. In this respect, nickel is typical of a variety of inexpensive metals which are potential electrode materials, however, which are not useful due to oxidative instability. In the case of nickel with the ferrocene redox couple, this problem can be overcome by chemical modification of the nickel electrode interface. Surface silylation techniques can be used to covalently bond various moieties to an anodized nickel electrode surface, although, these surfaces appear less reactive with respect to silylation than previously reported platinum or gold surfaces. Attachment of 1,1'ferrocendiyldichlorosilane or serves to stabilize the nickel interface and to electrocatalyze the ferrocene redox reaction. This effect is obtained by a combination of electron mediation by the surface attached material and inhibition of surface oxidation. The latter is in part due to a physical effect creating an environment in which oxidation is not favorable.

Syntheses of acyclic polyethers containing a ferrocene nucleus and its extraction ability.

Abstract: Acyclic polyethers (7) (containing a ferrocene nucleus in both terminal sites) were synthesized by a one-pot reaction of 1,1′-diacetoxyferrocene with halide. Also, ferrocene derivatives (11) having polyethylene glycols were synthesized by the reaction of potassium salt of hydroxyferrocene with dihalide in DMF. On the addition of alkali metal thiocyanate in methanol, a hypsochromic shift and an increasing intensity of the absorption band at 438 nm were observed in ferrocene-containing polyethers 7, suggesting the complexing of 7 with cations. However, a similar spectral change could not be observed in 11. 7a extracts silver and thallium ions most effectively, the extraction efficiency of several metal cations being in this order: Ag+>Tl+>Cs+>K+>Li+>Na+.

Mössbauer studies of bridged ferrocenophane derivative’s polyiodides

Abstract: [2]Ferrocenophanes, the ring tilted ferrocene derivatives, were oxidized with iodine in benzene and studied by means of Mossbauer spectroscopy. The quadrupole splitting value of the compounds is found to be 3.70 mms−1 at 78 K, which is one of the largest found in ferrocene derivatives, suggesting the presence of a strong direct interaction between iron atoms and iodine atoms. The results were compared with [3] and [4] ferrocenophane’s polyiodides.

Synthesis, n.m.r. spectra, and structure of macrocyclic compounds containing the ferrocene unit

Abstract: The condensation of 1,1′-bis(chlorocarbonyl)ferrocene with diaza-18-crown-6 gives 1,1′-(1,4,10,13-tetraoxa-7,16-diazacyclo-octadecane-7,16-diyldicarbonyl)ferrocene (5) together with its dimer 1,1″: 1′,1‴-bis-(1,4,10,13-tetraoxa-7,16-diazacyclo-octadecane-7,16-diyldicarbonyl) bisferrocene (6) and the separation and isolation of these compounds are described. High resolution 1H and 13C n.m.r. spectra using homo- and hetero-nuclear decoupling techniques allow a complete assignment of the spectral data for (5) and (6) and lead to a proposal of a structure for (5) involving a trans-disposition of the amide carbonyl groups. Variable-temperature n.m.r. data on (6) reveal two distinct dynamic processes within the molecule involving rotation about the ferrocene-carbonyl bond (ΔG‡= 50 kJ mol–1, Tc=–10 °C) and rotation about the N–CO bond (ΔG‡= 67 kJ mol–1, Tc=+60 °C). The preparation, 1H and 13C n.m.r. data of monocyclic compounds containing the ferrocene unit (13a–c), (14) and (15) are also described and the details of the synthesis of an 15N-labelled analogue of (13c), the macrocycle (16), are reported.

Optically active rhenium carbonyl-quinone radical complexes: Stereoselectivity in ligand substitution of organometallic complexes

Abstract: cases are even lower due to the competitive reactions. This is also evident from Table 2, where the results of the oxidation of (1-hydroxyethyl)ferrocene (compound No. 2) at various reaction conditions are summarized. Thus, all the oxidation reagents studied can be used successfully with carefully chosen reaction conditions for sensitive oxidations of primary and secondary alcohols bound to the ferrocene nucleus. The selective oxidation affords carbonyl compounds. All the ferrocene derivates and oxidation reagents used were prepared and purified according to the literature data(i, 3, 4, 6)

Heterometallic Ferrocene-based Transition Metal Compounds

Abstract: The literature data on the synthesis, properties, and applications of ferrocene derivatives containing a d element or its inorganic and organic derivatives in the molecule are described systematically and surveyed. The bibliography includes 293 references.

Electron Transfer Reaction Between Ferrocene and Tris (1,10‐Phenanthroline) Cobalt (HI) in Micellar Systems

Abstract: The kinetics of the electron transfer reaction between ferrocene and tris (1, 10-phenanthroline) Cobalt (III) have been studied by the stopped-flow method at 20.0°C and ionic strength 0.02 mol dm−3 in the presence of anionic (SDS), cationic (CTAB) and non-ionic (Triton X-100) micelles. Cationic and non-ionic micelles inhibit the oxidation reaction according to a model in which the ferrocene is partitioned between the aqueous and micellar pseudo-phases, the reaction proceeding primarily in the aqueous phase. On the contrary anionic micelles catalyze the reaction which occurs in the micellar phase. The estimated binding constants of ferrocene to the different micelles are quite similar.

Substituent effect on wave numbers of C=O valence vibrations in ferrocene derivatives

Abstract: Mesure, dans des conditions identiques (dans CCl 4 ) du nombre d'onde de la vibration de valence ν (c=0) de derives du ferrocene pour verifier la validite des equations de Seth-Paul-Van Duyse

The effect of temperature on yields and product ratios during the synthesis of cryptands containing the ferrocene unit

Abstract: The condensation of 1,1-bis(chlorocarbonyl)ferrocene with diaza-18-crown-6 gives 1,1′-(1,4,10,13-tetraoxa-7,16-diazacyclo-octadecane-7,16-diyldicarbonly)ferrocene (3) and its dimer 1,1″; 1′, 1‴-bis (1,4,10,13-tetraoxa-7,16-diaza-cyclo-octadecane-7,16-diyldicarbonyl) bisferrocene (4); the overall yields of (3) and (4) and the product ratios are dependent upon the reaction temperature.