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2 article(s) from Skowerski, Krzysztof

Effective immobilisation of a metathesis catalyst bearing an ammonium-tagged NHC ligand on various solid supports

Krzysztof Skowerski,
Jacek Białecki,
Stefan J. Czarnocki,
Karolina Żukowska and
Karol Grela

Beilstein J. Org. Chem. 2016, 12, 5–15, doi:10.3762/bjoc.12.2

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Figure 1: Selected classical and heterogeneous ruthenium complexes.

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Figure 2: Applications of NHC ammonium-tagged catalysts.

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Scheme 1: Synthesis of ammonium-tagged complex 8.

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Scheme 2: Model RCM reaction.

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Figure 3: Influence of temperature and concentration on RCM of 9. Conditions: 1 mol % of 8-C* (5 wt % on C*),...

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Figure 4: Presentation of various Ru-based catalysts. From the left: 20 mg of Gre-II powder, 20 mg of 8 as fi...

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Figure 5: Influence of the support type on the metathesis outcome. Conditions: 1 mol % 8, toluene 80 °C; [9] ...

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Figure 6: Filtration of the reaction mixture after RCM of 9 catalysed by 1 mol % of 8-powder.

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Figure 7: Split test during RCM of 9 (1 mol % cat, toluene 80 °C, [9] = 0.2 M). The reaction mixtures were fi...

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Scheme 3: Model metathesis reactions used in tests.

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Figure 8: RCM of 9 catalysed by 8 and 8-Fe. Conditions: 1 mol % catalyst, toluene 80 °C, [9] = 0.2 M.

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Figure 9: Removal of 8-Fe and subsequent recovery of 8. A: stirred reaction mixture containing 8-Fe, B: the s...

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Scheme 4: Supported catalyst 8 in sequential cross metathesis and reduction.

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Published 05 Jan 2016

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Nitro-Grela-type complexes containing iodides – robust and selective catalysts for olefin metathesis under challenging conditions

Andrzej Tracz,
Mateusz Matczak,
Katarzyna Urbaniak and
Krzysztof Skowerski

Beilstein J. Org. Chem. 2015, 11, 1823–1832, doi:10.3762/bjoc.11.198

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Figure 1: The diversity of Hoveyda-type complexes (Mes – 2,4,6-trimethylphenyl, DIPP – 2,6-diisopropylphenyl)....

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Scheme 1: Modifications of the 2^nd generation alkylidene complexes.

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Scheme 2: Synthesis of iodide-containing nitro-Grela type catalysts.

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Figure 2: Reaction profiles for RCM of DEDAM; toluene, 0.2 M, 18 °C, [Ru] 0.15 mol %; conversion determined b...

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Figure 3: RCM of 1 (toluene, 0.05 M, 25 °C, [Ru] 0.01 mol %); blue diamonds – original (pre)catalysts; red sq...

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Figure 4: RCM of 1 (toluene, 0.05 M, 25 °C, [Ru] 0.01 mol %): top – productive RCM and possible non-productiv...

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Published 06 Oct 2015

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