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  • Catalysis, heterogeneous  (2)
  • 1,3-Dioxin-4-ones  (1)
  • Benzo[g,h,i]perylenes  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Hetero diels-alder reactions of allenes on silica gel surface and under liquid-phase conditions (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2207-2208 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Allenes ; Hetero Diels-Alder reactions ; Catalysis, heterogeneous ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Some examples of cycloadditions of 1-ethoxy-1,2-propadiene with 1-oxa-1,3-dienes, catalyzed by acid-free silica gel, are reported.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19891221124
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Cycloadditions, 34. Donor-Substituted Allenes in Diels-Alder Reactions with Inverse Electron Demand (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1425-1429 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Allenes ; Hetero Diels-Alder reactions ; Catalysis, heterogeneous ; Glutaraldehyde ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Several cycloaddition reactions of 1-alkoxy-1,2-propadienes 1 with 1-oxa-1,3-dienes 2, catalyzed by acid-free silica gel, are described. The resulting 3,4-dihydro-3-methylene-2H-pyrans 3 are transformed into synthetically interesting glutaraldehyde derivatives 10 - 13.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19911240617
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Cycloadditions, 53. New spirocyclic chiral dienes  -  synthesis and diastereoselective Diels-Alder reactions with N-phenylmaleimide (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 1455-1461 
    Details
    ISSN: 0947-3440
    Schlagwort(e): Dienes, chiral ; 1,3-Dioxin-4-ones ; (-)-Menthone ; Diels-Alder reactions, diastereoselective ; Cycloadditions, high-pressure ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis and diastereoselective Diels-Alder reactions of new spirocyclic chiral dienes are reported. Starting with diketene and (-)-menthone (1), we prepared the diastereomeric diketene-menthone adducts 2 and 3. Further derivatization and olefination afforded four chiral dienes 12-15. Diastereoselective Diels-Alder reactions of these dienes with N-phenylmaleimide (NPM) under high-pressure conditions yielded the corresponding cycloadducts 16-19. Olefination of 6-diethylphosphonomethyl-2,2-dimethyl-1,3-dioxin-4-one 8 with formaldehyde led to unexpected compounds 9-11 resulting from the originally formed olefination product.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.1995199508198
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis and X-ray Analysis of New [5]Helicenes - HMO Calculations on the Photocyclization of the Stilbene Precursors (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 1709-1718 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Sum of free valence numbers ; Benzo[g,h,i]perylenes ; [5]Helicenes ; Photocyclization ; HMO calculations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The syntheses of the new pentahelicenes 5, 11, 17, 21, and 28 with various substituents are described. In the case of 2,13-dicyano-[5]helicene (11) optical resolution was achieved by HPLC using a column packed with γ-cyclodextrin. However, the enantiomers racemized within a few hours. On the other hand, the enantiomers of 28 turned out to be stable after separation on triacetylcellulose using MPLC. The crystal structures of 11, 17, and 21 were solved and indicated the typical distortions which are expected for helicenes. The model of the sum of free valence numbers was applied in order to rationalize the reactivity pattern of the photochemical phenanthrene cyclization.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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