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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 45 (1980), S. 4515-4519 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 120 (1989), S. 1113-1118 
    ISSN: 1434-4475
    Keywords: Cycloadditions ; Diels-Alder ; Vinylpyrazoles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 1-tert-Butyl-4-vinylpyrazol1 a reagiert mit Acetylendicarbonsäure-dimethylester (DMAD), Propiolsäuremethylester (MP) und N-Phenylmaleimid (NPMI) zu den entsprechenden Indazolderivaten2,3 bzw.5, als Ergebnis einer Diels-Alder-([4+2])-Cycloaddition. Bei der Reaktion mit Azodicarbonsäure-diethylester (DEAZD), Tetracyanethylen (TCNE) und 4-Phenyl-1,2,4-triazol-3,5-dion (PTAD) wird exklusiv die Olefingruppe von1 a angegriffen, wobei die Addukte6,7 bzw.8 isoliert werden. Die Alkenylpyrazole1 b–d reagieren mitDMAD und N-Phenylmaleimid unter Bildung von Polymeren.
    Notes: Summary 1-tert-Butyl-4-vinylpyrazole1 a reacts with dimethyl acetylenedicarboxylate (DMAD), methyl propiolate (MP) and N-phenylmaleimide (NPMI) affording the indazole derivatives2,3, and5 as a result of a Diels-Alder ([4 + 2]) cycloaddition. With diethylazodicarboxylate (DEAZD), tetracyanoethylene (TCNE) and 4-phenyl-1,2,4-triazole-3,5-dione (PTAD) the reaction takes place exclusively through the olefinic substituent and the adducts6,7, and9 were isolated. The alkenylpyrazoles1 b–d reacted withDMAD and N-phenylmaleimide to give polymers.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-4475
    Keywords: Cycloaddition ; Ene-reaction ; Vinylpyrazole ; NMR ; Deuteration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Reaktion von Methylpropiolat (MP) mit an der 5-Stellung deuteriertem 1-Phenyl-4-vinylpyrazol wurde zur vereinfachten Interpretation der1H-NMR-Spektren einer 1:2 Mischung von Addukten aus der Diels-Alder-Cycloaddition mit nachfolgender nicht-regioselektiver „en-Reaktion“ eingesetzt. Das deuterierte Substrat erlaubte zugleich auch die Bestimmung der Stereochemie der en-Reaktion als einen konzertiertencis-Prozeß.
    Notes: Summary The reaction of methyl propiolate (MP) with 1-phenyl-4-vinylpyrazole deuterated in the five position has clarified the1H NMR spectrum of the mixture of the adducts 1:2 which are obtained as a result of a Diels-Alder cycloaddition followed by a non-regioselective “ene” reaction. The deuterated substrate allowed at the same time to establish the stereochemistry of the ene reaction as a concertedcis process.
    Type of Medium: Electronic Resource
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