5 article(s) from Urbaniak, Katarzyna
- Full Research Paper
- Published 19 Feb 2019
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Scheme 1: Synthesis of 2-unsubstituted imidazole N-oxides 1 from α-hydroxyiminoketones 2 and formaldimines 3.
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Scheme 2: Preparation of adamantyloxyamine (4) and its conversion into N-(adamantyloxy)formaldimine (6a); Ad ...
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Scheme 3: Synthesis of 1-(adamantyloxy)imidazole 3-oxides 7a–e and 1-adamantylimidazole 3-oxides 7f,g in acet...
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Scheme 4: Deoxygenation of 1-(adamantyloxy)imidazole 3-oxides 7a–d and isomerization of 7b into imidazole-2-o...
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Scheme 5: Conversions of imidazole 3-oxides 7a–d into 1-(adamantyloxy)imidazole-2-thiones 10a–d via sulfur tr...
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Scheme 6: Syntheses of the non-symmetric 1,3-dialkoxyimidazolium bromides 13a–c and 1-alkyl-3-alkoxyimidazoli...
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Scheme 7: Attempted O-adamantylation of imidazole N-oxide 7a with adamantan-1-yl trifluoroacetate and subsequ...
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Scheme 8: Synthesis of the symmetric 1,3-di(adamantyloxy)imidazolium bromide (15) and its transformation to 1...
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- Full Research Paper
- Published 17 Jan 2019
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Figure 1: Structures of the Ru-based catalysts used in this study.
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- Full Research Paper
- Published 19 Jul 2018
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Scheme 1: Reactions of aryl/hetarylthiochalcones 1a–d with 1,4-naphthoquinone (2b).
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Scheme 2: Reactions of thiochalcones 1a–d with 1,4-anthraquinones 2c and 2d.
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Figure 1: ORTEP plot [29] of the molecular structure of 4k showing the major conformation of the disordered thiop...
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Figure 2: Products of the reactions of thiochalcones 1a and 1b with 1,4-benzoquinone (2a) and of 1a with mena...
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- Full Research Paper
- Published 03 Mar 2017
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Scheme 1: Generation and typical reactions of the reactive dialkyl and diaryl thiocarbonyl S-methanides 1.
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Figure 1: Structures of the reactive intermediates as a diradical 6 or a zwitterion 7 in the course of the di...
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Scheme 2: The in situ generation of phenyl selenophen-2-yl S-methanide (8) and its competitive reactions: 1,3...
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Figure 2: Potential 1,3-dipolar electrocyclization of thiocabonyl S-methanide 8A. Computed enthalpies (free e...
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Figure 3: Stepwise radical dimerization of the reactive thiocarbonyl S-methanide 8. Computed enthalpies (free...
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Figure 4: Potential competitive cyclization reactions of the intermediate diradical 12.
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Figure 5: a) Spin densities in the conformers 12F and 12G of diradical 12. b) Heteroatom effect on the magnit...
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- Full Research Paper
- Published 06 Oct 2015
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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 2nd 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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