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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallkomplexe von Cyanamiden und ihre Alkylierung zu Cyanamidiumsalzen. Eine allgemeine Synthese hochsubstituierter Harnstoffe, Isoharnstoffe und GuanidineAus disubstituierten Cyanamiden und Lewis-Säuren werden die Komplexe 3a - p erhalten. Nach einer Röntgenstrukturanalyse hat der Antimonpentachlorid-Komplex 3a weder s̰- noch π-Symmetrie ( ∡ C≡N - Sb 133°). Die Komplexe 3 mit SbCl5 oder FeCl3 können mit tertiären Alkylchloriden zu den kristallinen Cyanamidiumsalzen 5a - m alkyliert werden. Mit Wasser, primären oder sekundären Alkoholen reagieren die Verbindungen 5 zu Harnstoffen (11) bzw. Uroniumsalzen (8a - z), mit Ammoniak, primären oder sekundären Aminen zu Guanidiniumsalzen (9a - s).
    Notes: The complexes 3a - p were prepared from disubstituted cyanamides and Lewis acids. According to a X-ray structural analysis, the antimony pentachloride complex 3a is neither a s̰ nor a π complex (∡ C≡N - Sb 133°). The complexes 3 with SbCl5 and FeCl3 can be alkylated with tertiary alkyl chlorides, affording crystalline cyanamidium salts (5a - m) which were characterized by reactions with water, primary or secondary alcohols to give ureas (11) and uronium salts (8a - z), respectively. The guanidinium salts 9a - s were obtained with ammonia, primary and secondary amines.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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