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  • 1
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Coordination complexes of phenanthrenequinone monoxime with VIVO, CrIII, FeIII, NiII or CuII have been synthesised and characterized by magnetic moment, i.r., and thermogravimetric analysis, and electronic and electron spin resonance spectral studies.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 1029-1050 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nitrile Oxides, XVIII1). - The Tetramer of Fulminic Acid (Isocyanilic Acid) and its DerivativesThe structure 3b of α-isocyanilic acid was established by stepwise degradation to furazandicarboxamide (13) as (E,E)-3,4-bis(hydroxyiminomethyl)-1,2,5-oxadiazole 2-oxide. For 3,4-dicyano-1,2,5-oxadiazole 2-oxide (dicyanofuroxan, 5) a new synthesis was developed and the mechanism of its hydrolysis ot 3-carbamoly-4-cyano-1,2,5-oxadiazole 2-oxide (anhydroisocyanilic acid) established. Chemical re-examination and spectroscopic evidence show most of the compounds formed from 3b by the action of water, acidic or basic reagents to have structures different from those previously assigned. All C3 and C4 derivatives of 3b which were considered to be open-chain compounds are really heterocyclics. A new mechanistic interpretation of these reactions is attempted.
    Notes: Die Struktur 3b der a-Isocyanilsaure als (E,E)-3,4-Bis(hydroxyiminomethyl)-1,2,5-oxadiazol-2-oxid wurde durch stufenweisen Abbau zu dem bekannten Furazandicarbonsaurediamid (13) bewiesen. 3,4-Dicyan-1,2,5-oxadiazol-2-oxid (Dicyanfuroxan, 5) wurde auf einem neuen Weg synthetisiert und der Mechanismus seiner Hydrolyse zu 3-Carbamoly-4-cyan-1,2,5-oxadiazol-2-oxid (Anhydro-isocyanilsäure) aufgeklart. Die meisten der aus 3b unter Einwirkung von Wasser, sauren oder basischen Agenzien entstehenden Verbindungen haben aufgrund neuer chemischer und spektroskopischer Befunde eine andere als die ihnen bisher zugeschriebene Struktur. Alle bisher als offenkettige C3- oder C4-Derivate formulierten Folgeprodukte von 3 sind in Wirklichkeit heterocyclische Verbindungen. Der Versuch einer neuen mechanistischen Deutung dieser Reaktionen wird vorgelegt.
    Type of Medium: Electronic Resource
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