5 article(s) from Nikolaev, Valerij A
- Full Research Paper
- Published 28 Aug 2018
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Figure 1: The structures of carbocyclic diazodiketones 1a–g and C–H-donating tetrahydrofuran used in the proj...
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Figure 2: Molecular structure of hydrazone 2b as determined by X-ray analysis data (Olex2 plot with 50% proba...
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Scheme 1: Photochemical cycloelimination of furans from hydrazones 2d,e.
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Scheme 2: Different pathways of diazodiketones 1 light-induced reactions in the singlet (reaction I) and trip...
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- Full Research Paper
- Published 30 Nov 2017
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Scheme 1: General scheme for intramolecular heterocylization of intermediate X-ylides.
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Figure 1: Thioamides 1a–e, diazoesters 2a–d and Rh(II)-catalysts used in the project.
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Figure 2: The structures of compounds 4a and 3b according to the data of X-ray analysis (Olex2 plot with 50% ...
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Scheme 2: Rh(II)-Catalyzed reactions of α-diazocyanoacetic ester 2d with α-cyanothioacetamides 1a–e.
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Figure 3: The structure of thiophene 5c according to the data of X-ray analysis (Olex2 plot with 50% probabil...
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Scheme 3: Interaction of thioacetamide 1e with dirhodium pivalate to produce complex 6e.
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Figure 4: The structure of the complex 6e according to the data of X-ray analysis (Olex2 plot with 50% probab...
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Scheme 4: The assumed mechanism for the formation of thiophenes 3, 5.
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Scheme 5: The plausible mechanism for the formation of thiophenes 4.
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- Letter
- Published 25 Aug 2016
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Scheme 1: Catalytic reactions of diazocarbonyl compounds with unsaturated δ-amino esters.
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Figure 1: The structures of the starting compounds 1–3 and catalysts used in this study.
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Scheme 2: The assumed pathway for the occurance of amides 6a–c by way of the catalytic Wolff rearrangement.
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Scheme 3: The assumed mechanism for the formation of the amides 4 and 7 during oxidative cleavage of the N–H-...
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- Published 20 Apr 2015
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Scheme 1: The key experimental results on the DDC 1 reactions with thioketones 2 [19-21].
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Figure 1: Diazo compounds 1 and thioketones 2 used in the study.
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Scheme 2: General scheme for reactions of DDC 1 with thiobenzophenone (2a).
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Figure 2: Optimized structures of the lowest energy Z,E-conformers of diazo compounds 1a–d.
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Scheme 3: Reactions of the intermediate thiocarbonyl ylide 7'd via competative 1,5-EC (a) or 1,3-EC (b) follo...
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- Published 02 Dec 2013
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Figure 1: Thioketones 1 and diazodicarbonyl compounds 2.
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Figure 2: ORTEP plot [17] of the molecular structure of the 1,3-oxathiole 3a (50% probability ellipsoids; arbitra...
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Scheme 1: Reaction of diazocarbonyl compounds 2a,c,e with adamantane-2-thione (1b).
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Scheme 2: Three possible pathways A, B and C for the formation of 1,3-oxathioles 3,7 and thiiranes 5 and 8 fr...
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Scheme 3: Two competitive transformations of dibenzoyldiazomethane (2b) at 80 °С leading to 3b and 4b.
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Scheme 4: Interconversion of 1,3-oxathiole 3e and C=S ylide 6e’ accompanied by 1,3-electrocyclization and des...
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Figure 3: Energy profile for the transformation of 1,3-oxathiole 3e to alkene 5e. Relative free energies (kca...
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