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2 article(s) from Woźniak, Krzysztof

Pyrene–nucleobase conjugates: synthesis, oligonucleotide binding and confocal bioimaging studies

Artur Jabłoński,
Yannic Fritz,
Hans-Achim Wagenknecht,
Rafał Czerwieniec,
Tytus Bernaś,
Damian Trzybiński,
Krzysztof Woźniak and
Konrad Kowalski

Beilstein J. Org. Chem. 2017, 13, 2521–2534, doi:10.3762/bjoc.13.249

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Figure 1: Examples of pyrene derivatives with relevance to nucleic acid chemistry and structures of pyrenyl–n...

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Scheme 1: Synthesis of pyrene–nucleobase conjugates 2–5.

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Figure 2: ORTEP diagram of 2 at 50% probability level. The hydrogen and halogen bonds are represented by dash...

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Figure 3: Intermolecular hydrogen bonding (N22–H22···O27 distance = 2.882(2) Å) and halogen bonding (C30–Cl31...

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Figure 4: UV–vis absorption and fluorescence spectra of pyrene–adenines 5 (a) and 3 (b) in diluted (c ≈ 10⁻⁵ ...

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Figure 5: Absorption changes during titration of 2 and 4 (λ = 344 nm) in the presence of (dA)₁₀, and 3 and 5 ...

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Figure 6: Cellular distribution of 4 in living HeLa cells. (A) Fluorescence of 4 (green). (B) Fluorescence of...

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Figure 7: Cellular distribution of 5 in living HeLa cells. (A) Fluorescence of 5 (green). Arrows are marking ...

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Published 28 Nov 2017

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Consequences of the electronic tuning of latent ruthenium-based olefin metathesis catalysts on their reactivity

Karolina Żukowska,
Eva Pump,
Aleksandra E. Pazio,
Krzysztof Woźniak,
Luigi Cavallo and
Christian Slugovc

Beilstein J. Org. Chem. 2015, 11, 1458–1468, doi:10.3762/bjoc.11.158

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Figure 1: Selected ruthenium-based complexes.

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Scheme 1: trans–cis Isomerization.

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Scheme 2: Synthesis of the ligand precursors.

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Scheme 3: Synthesis of the ruthenium complexes.

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Figure 2: ADPs (atomic displacement parameters) and atoms labeling of the first molecule in the asymmetric pa...

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Figure 3: Superposition of the asymmetric parts of units’ cells in both investigated structures: an example o...

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Figure 4: Energy profile of trans–cis isomerization, modelled in CH₂Cl₂, (ΔE in kcal/mol). Geometry optimizat...

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Scheme 4: Possible reaction pathways of 16.

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Figure 5: Time/conversion plots for the transformation of 16 catalyzed by 5 mol % of the trans isomers of tra...

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Figure 6: Composition of a reaction mixture after subjecting 16 to 5 mol % cis-5a in xylene, 140 °C. Lines ar...

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Figure 7: Monomers utilized in model ROMP reactions.

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Figure 8: Number-average molecular weight (M_n) of poly-21 prepared with initiators 5a, 14 and 15 plotted agai...

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Figure 9: STA analysis of polymerization of 22 (left) and 23 (right), initiated by 5a, 14 and 15. Reaction co...

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Published 20 Aug 2015

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