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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structures of the [4 + 1] Cycloaddukts from Phenyl Isocyanide and 1,5-Diaryl-4-benzoylpyrrole-2,3-diones and of Their Secondary Products.  -  A CorrectionThe 1,5-diaryl-4-benzoylpyrrole-2,3-diones 1 add one mole of phenyl isocyanide in a reversible thermal [4 + 1] cycloaddition. An X-ray structure determination now revealed the furo[3.4-b]-pyrroldione structure 3b of the compound obtained from 1b. Compound 3b crystallizes in the monoclinic space group C52h-P21/a with 8 molecules per cell and exists in the (Z)-configuration. The structures of the products resulting from the reaction of the furo[3,4-b]pyrroldione 3a with hydrochloric acid, water, and aniline, respectively, have been elucidated by means of mass spectra as well as IR, UV, and 13C-NMR spectra. Accordingly, in each case the furan ring had been opened. Possible mechanisms of the formation of the [4 + 1] cycloadducts and of the secondary products are discussed.
    Notes: Die 1,5-Diaryl-4-benzoylpyrrol-2,3-dione 1 addieren 1 mol Phenylisocyanid in einer reversiblen thermischen [4 + 1]-Cycloaddition. Durch eine Röntgenstrukturanalyse wurde die Furo[3,4-b]-pyrrol-Struktur 3b der aus 1b erhaltenen Verbindung aufgeklärt. 3b kristallisiert monoklin in der Raumgruppe C52h-P21/a mit 8 Molekülen pro Elementarzelle und liegt in der (Z)-Konfiguration vor. Mit Hilfe von Massenspektren sowie IR-, UV- und 13C-NMR-Spektren wurden die Strukturen der aus dem Furo[3,4-b]pyrroldion 3a und Salzsäure, Wasser sowie Anilin entstandenen Produkte bestimmt. Danach wurde in allen Fällen der Furanring geöffnet. Mögliche Mechanismen der Bildung der [4 + 1]-Cycloaddukte und ihrer Folgeprodukte werden diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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