Paramagnetic ferrocene acid adducts

Aly, M. M.; Banthorpe, D. V.; Bramley, Richard; Cooper, R.E.; Jopling, D. W.; Upadhyay, J.; Wassermann, A.; Woolliams, P. R.

doi:10.1007/bf00901391

Cited by 11 publications

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“…Cyclization is initiated by oxidation of the core electron-rich octamethylferrocene moiety in 4a to the corresponding ferrocenium ion 4a + . It is worth noting that protonation facilitates such oxidation, 48,49 potentially explaining the observed rate acceleration of the cyclization reaction in the presence of acids. 50−52 Single electron transfer (SET) from the vinylic π-orbital into the Fe-centered SOMO initiates or facilitates (in a concerted fashion as shown) a radical rearrangement in which the carbon bridge is formed.…”

Section: ■ Results and Discussionmentioning

confidence: 74%

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Carbon-Rich Trinuclear Octamethylferrocenophanes

et al. 2019

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Several trinuclear ferrocenes are obtained by Friedel− Crafts reaction of octamethylferrocene with ferrocenoyl chloride and subsequent modifications. 1,1′-Diferrocenoyloctamethylferrocene (3) is transformed to the divinyl derivative (4a) by reaction with MeLi and AlCl 3 . The reactive 4a cyclizes spontaneously to a [4]ferrocenophane with buta-1,3-diene handle (5) or in the presence of AlCl 3 to a [3]ferrocenophane with propene handle (6). Structure assignments are supported by X-ray crystallography and NMR spectroscopy, and mechanisms are proposed. Electrochemical behavior of the compounds was investigated with cyclic voltammetry, and assignments of the redox processes were carried out with the aid of density functional theory calculations. The synthesized compounds and demonstrated transformations represent useful tools for preparation of materials for charge-transport studies in metal−molecule−metal junctions.

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Section: ■ Results and Discussionmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 84%

Carbon-Rich Trinuclear Octamethylferrocenophanes

et al. 2019

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Simple and rapid spectrophotometric and titrimetric methods for the determination of ascorbic acid in pharmaceutical preparations

Aly

Hassan

Souliman

1980

J. Chem. Technol. Biotechnol.

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Ascorbic acid in pharmaceutical preparations can be determined by either spectrophotometric or titrimetric methods by its reaction with ferricinium trichloroacetate at pH 3. The latter is quantitatively reduced to ferrocene. This is extracted by chloroform and its concentration calculated from the absorbance at 440 nm. Alternatively, an aqueous solution of ascorbic acid is titrated with that of the blue ferricinium salt which acts as an indicator. Vitamins, minerals, hormones, dextrose and coloured additives do not interfere with the reaction. Both methods are simple, rapid and sensitive.

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Hydrophilic Macromolecular Ferricenium Salts — Part I: Preparative and Spectroscopic Features of Selected Mononuclear Ferricenium Compound

Neuse

1985

Metal-Containing Polymeric Systems

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Paramagnetic ferrocene acid adducts

Cited by 11 publications

References 0 publications

Carbon-Rich Trinuclear Octamethylferrocenophanes

Carbon-Rich Trinuclear Octamethylferrocenophanes

Simple and rapid spectrophotometric and titrimetric methods for the determination of ascorbic acid in pharmaceutical preparations

Hydrophilic Macromolecular Ferricenium Salts — Part I: Preparative and Spectroscopic Features of Selected Mononuclear Ferricenium Compound

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