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2 article(s) from Heinze, Katja

Polysubstituted ferrocenes as tunable redox mediators

Sven D. Waniek,
Jan Klett,
Christoph Förster and
Katja Heinze

Beilstein J. Org. Chem. 2018, 14, 1004–1015, doi:10.3762/bjoc.14.86

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Scheme 1: Selected transformations with ferrocene/ferrocenium as SET reagents (a) [27], catalyzed (b,c) [29-31] and medi...

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Scheme 2: Methyl esters of ferrocene carboxylic acids 1 [45,46], 2 [47-49], 2a [50], 2b [51,52], 3, 4 [54] and pseudo octahedral high-spin...

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Figure 1: Normalized cyclic voltammograms for anodic sweeps of 1–4 in CH₂Cl₂/[n-Bu₄N][B(C₆F₅)₄] (scan rate 10...

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Figure 2: Electrochemical potentials E_1/2 (vs FcH/FcH⁺) of esters 1–4 versus sum of Hammett values ∑σ_p/m with...

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Figure 3: a) Partial ATR IR spectra (transmission normalized, C=O stretching vibration region) of solids 1–4....

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Figure 4: IR spectroelectrochemical oxidation of 3 to 3⁺ in CH₂Cl₂/[n-Bu₄N][B(C₆F₅)₄] (C=O stretching vibrati...

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Figure 5: a) Normalized UV–vis spectra of 1–4 in CH₂Cl₂. b) Normalized UV–vis absorptions of 1⁺–4⁺ in CH₂Cl₂/[...

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Figure 6: Absorption energy E of ferrocene bands of 1–4 (a) and energies of the low energy absorption maxima ...

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Figure 7: UV–vis spectroelectrochemical oxidation of 3 in CH₂Cl₂/[n-Bu₄N][B(C₆F₅)₄] (0–1.1 V vs Ag pseudo ref...

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Figure 8: ¹H NMR oxidation titration of 3 in CD₂Cl₂ with [N(2,4-C₆H₃Br₂)₃]⁺ as oxidant. ^a[N(2,4-C₆H₃Br₂)₃]. ^b...

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Published 07 May 2018

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On the mechanism of imine elimination from Fischer tungsten carbene complexes

Philipp Veit,
Christoph Förster and
Katja Heinze

Beilstein J. Org. Chem. 2016, 12, 1322–1333, doi:10.3762/bjoc.12.125

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Scheme 1: Imine formation and isomerization reactions from NH carbene complexes Cr(CO)₅(E-2) (a) [27], Cr(CO)₅(E/Z...

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Scheme 2: Synthesis of W(CO)₅(E-2) from W(CO)₅(1^Et) [20,21] and aminoferrocene [40,41] with concomitant formation of E-1,2-...

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Scheme 3: Reaction pathways 1a/1b (migration–elimination) and 2a/2b (elimination–migration) for the formation...

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Scheme 4: Reaction pathways 3a/3b/3c (CO dissociation) for the formation of imine E-3 from W(CO)₅(E-2).

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Figure 1: DFT calculated oxidative addition/pseudorotation/reductive elimination pathway 3c from W(CO)₄(E-2) ...

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Figure 2: DFT calculated geometries of the two hydrido intermediates cis(N,H)-W(CO)₄(H)(Z-15) and cis(C,H)-W(...

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Scheme 5: Proposed reaction sequence from W(CO)₅(E-2) to W(CO)₅(PPh₃) in the presence of triphenylphosphane.

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Published 27 Jun 2016

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