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2 article(s) from Bockfeld, Dirk

Formation of alkyne-bridged ferrocenophanes using ring-closing alkyne metathesis on 1,1’-diacetylenic ferrocenes

Celine Bittner,
Dirk Bockfeld and
Matthias Tamm

Beilstein J. Org. Chem. 2019, 15, 2534–2543, doi:10.3762/bjoc.15.246

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Figure 1: Well-defined catalysts for alkyne metathesis.

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Figure 2: Examples for a ferrrocenic thiacrown ether complexing palladium (IV), and a dicationic ferrocenopha...

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Scheme 1: Synthesis of substrates 1 (a n = 2; b n = 3) via esterification of 3 and following RCAM with cataly...

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Figure 3: ORTEP diagram of 1a with thermal displacement parameters drawn at 50% probability; hydrogen atoms a...

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Figure 4: ORTEP diagram of 1b with thermal displacement parameters drawn at 50% probability; hydrogen atoms a...

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Figure 5: ORTEP diagram of 2a with thermal displacement parameters drawn at 50% probability; hydrogen atoms a...

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Figure 6: ORTEP diagram of 2b (one of two molecules of the asymmetric unit) with thermal displacement paramet...

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Figure 7: Cyclic voltammogram of 2a in DCM, 0.2 M n-Bu₄NPF₆, 1 V s⁻¹ scan rate, referenced vs FcH/FcH ⁺.

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Scheme 2: Top: Oxidation of ferrocenophane 2a to the corresponding ferrocenium cation 4 with Ag(SbF₆) in DCM ...

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Figure 8: ORTEP diagram of 4 with thermal displacement drawn at 50% probability; hydrogen atoms are omitted f...

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Figure 9: ¹H NMR (200.1 MHz, 298 K) spectrum of top: 2a in CDCl₃; bottom: 5 in THF-d₈ – signals for solvate T...

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Figure 10: ORTEP diagram of 5(thf) with thermal displacement drawn at 50% probability; hydrogens atoms, [SbF₆]⁻...

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Published 24 Oct 2019

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Efficient catalytic alkyne metathesis with a fluoroalkoxy-supported ditungsten(III) complex

Henrike Ehrhorn,
Janin Schlösser,
Dirk Bockfeld and
Matthias Tamm

Beilstein J. Org. Chem. 2018, 14, 2425–2434, doi:10.3762/bjoc.14.220

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Figure 1: Selected homogeneous catalysts for alkyne metathesis.

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Scheme 1: Synthesis of alkylidyne complex V from bimetallic [(t-BuO)₃W≡W(Ot-Bu)₃]; the catalytically active d...

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Scheme 2: Synthesis of hexakis(fluoroalkoxide) dimers Mo2F6 [73] and W2F3.

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Figure 2: Molecular structure of W2F3·NHMe₂ with thermal displacement parameters drawn at 50% probability. Hy...

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Scheme 3: Preparation of the alkylidyne complex W^PhF3.

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Figure 3: Molecular structure of W^PhF3 with thermal displacement parameters drawn at 50% probability. Hydroge...

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Scheme 4: Self-metathesis of 1-phenyl-1-propyne derivatives by tungsten complexes W2F3 and W^PhF3.

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Figure 4: Conversion versus time diagram for the self-metathesis of 1-phenyl-1-propyne catalyzed by 0.5 mol % ...

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Published 18 Sep 2018

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