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  • 1995-1999  (2)
  • Chemistry  (2)
  • Cyanamidocarboxylate complexes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 63-71 
    ISSN: 0044-2313
    Keywords: diethyl triorganostannylmethyl N-acyl aminomalonates ; ethyl 3-(trimethylstannyl)-N-acyl alaninates ; 1,2-oxastannolane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: C-Stannylmethylated N-Acetyl- and N-Formyl-aminomalonic Acid DerivativesTin compounds of the type Me3SnCH2C(NHCOR) · (COOEt)2 (1: R = CH3; 2: R = H) are synthesized by reaction of acylaminomalonates with iodomethyl trimethylstannane. The halogenation of 1 and 2 yields the halostannylsubstituted compounds Me3-nXnSnCH2C(NHCOR)(COOEt)2 3-6 (R = Me, H; n = 1, 2; X = Cl, Br). The decarbethoxylation (KRAPCHO reaction) of 1 and 2 gives ethyl 3-(trimethylstannyl)-N-acyl alaninates (7 and 8). With one equivalent KOH 1 and 2 are transformed into the monoethyl malonates of the type Me3SnCH2C(NHCOR)(COOH)(COOEt) (9: R = CH3), which convert simultaneously under decarboxylation into 7 and 8 and by cyclisation under elimination of methane into the 1,2-oxastannolane derivatives 10 and 11. IR, NMR data and the determination of the crystal structure reveal for MeBr2SnCH2C(NHCOCH3)(COOEt)2 (5) hexacoordinated tin by intramolecular coordination of the amide-CO and one of the ester-CO groups.
    Notes: Zinnverbindungen des Typs Me3SnCH2C(NHCOR)(COOEt)2 (1: R = CH3; 2: R = H) werden durch Umsetzung von Acylaminomalonsäureestern mit Iodomethyltrimethylstannan dargestellt. Die Halogenierung von 1 und 2 liefert die halogenostannylsubstituierten Verbindungen Me3-nXnSnCH2C(NHCOR)(COOEt)2 3-6 (R = Me, H; n = 1, 2; X = Cl, Br). Die Decarbethoxylierung (KRAPCHO-Reaktion) von 1 und 2 führt zu 3-(Trimethylstannyl)-N-acyl-alaninethylestern (7 und 8). Mit einem Äquivalent KOH werden 1 und 2 in die Monoethylester des Typs Me3SnCH2C(NHCOR)(COOH)(COOEt) (9: R = CH3) überführt, die sich in Folgereaktionen sowohl unter Decarboxylierung zu 7 bzw. 8 als auch durch Cyclisierung unter Methanabspaltung zu den 1,2-Oxastannolanderivaten 10 bzw. 11 umwandeln. IR-, NMR-Daten und die Bestimmung der Kristallstruktur beweisen für MeBr2SnCH2C(NHCOCH3)(COOEt)2 (5) hexakoordiniertes Zinn durch intramolekulare Koordination der Amid-CO- sowie einer Ester-CO-Gruppe.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Cyanamidocarboxylate complexes ; IR ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pseudoelement Compounds VII. [1] Crystal and Molecular Structure of Tris(ethylenediamine)nickel(II)-bis(2-methyl-4-chlorophenoxy-cyanamidoacetate)Surprisingly, in the presence of ethylenediamine 2-methyl-4-chlorphenoxy-cyanamidoactetate reacts with nickel(II) and copper(II) ions preferentially under formation of complexes of the type [M(en)3]X2. The IR spectra and the X-ray diffraction investigations corresponding to [Ni(en)3][2-Me-ClC6H3OCH2C(O)NCN]2 show that two cyanamidocarboxylate ions [RC(O)NCN]- are bonded to the complex cation through, in each case, two N—H … O=C hydrogen bonds between NH protons of ethylenediamine ligands and the carbonyl oxygen atoms. Additionally, in the crystal weak N—H … N≡C bridges were found between the nitrile nitrogen atoms of the anions and NH protons of neighbouring complex cations.
    Notes: 2-Methyl-4-chlorphenoxy-cyanamidoacetat bildet zu unserer Überraschung mit Nickel(II)- und Kupfer(II)-Ionen in Gegenwart von Ethylendiamin bevorzugt Komplexe der Zusammensetzung [M(en)3]X2. IR-spektroskopische Messungen und die Kristallstruktrukturuntersuchung an [Ni(en)3][2-Me-4-ClC6H3OCH2C(O)NCN]2 zeigen, daß zwei Cyanamidocarboxylat-Anionen [RC(O)NCN]- über jeweils zwei N—H … O=C-Wasserstoffbrückenbindungen zwischen N—H-Protonen der Ethylendiamin-Liganden und den Carbonyl-Sauerstoffatomen an ein komplexes Kation [Ni(en)3]2+ gebunden sind. Im Kristall liegen außerdem noch schwache N—H … N≡C-Brücken zwischen Nitril-N-Atomen der Anionen und NH-Protonen benachbarter komplexer Kationen vor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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