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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3816-3830 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nitrile Ylides from Oxazolin-5-ones; Detection by Adduct Formation and Rearrangement into 2-Azabuta-1.3-dienesOxazolin-5-ones undergo thermal cycloelimination of carbon dioxide to yield nitrile ylides 11 which are detected by means of adduct formation with activated dipolarophiles. In absence of dipolarophiles rearrangement to 2-azabuta-1.3-dienes (15, 16) may occur which react intramolecularly with suitable functional groups to bisenamines 18, N-alkenylpyrroles 22 and Δ1-pyrrolines 24. The 1.5-dipolar cyclisation of nitrile ylides to pyrroles is described.
    Notes: Oxazolinone-(5) zerfallen beim Erhitzen unter Cycloeliminierung von Kohlendioxid in Nitril-Ylide 11, die durch Adduktbildung mit aktivierten Dipolarophilen nachgewiesen werden. Bei Abwesenheit von Dipolarophilen kann Umlagerung in 2-Aza-butadiene-(1.3) (15, 16) eintreten, die intramolekular mit geeigneten funktionellen Gruppen zu Bis-enaminen 18, N-Alkenyl-pyrrolen 22 und Δ-Pyrrolinen 24 weiterreagieren. Die 1.5-dipolare Cyclisierung von Nitril-Yliden zu Pyrrolen wird beschrieben.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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