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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1907-1913 
    ISSN: 0009-2940
    Keywords: Carbenes, alkylideneamino- ; Isocyanides, carbamoyl ; Aminolyses ; Thiolyses ; Chromium carbene complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions at the Coordinated Trichoromethyl Isocyanide, III.  -  Hererofunctionalized (Alkylideneamino)carbene and Carbamoyl IsocyanidesReaction of pentacarbonyl(trichloromethyl isocyanide)chromium (2) with the secondary amines pyrrolidine, 2,6-dimethylpiperidine, and diethylamine in a 1:2 ratio gives [amino(imino)carbene]-chromium complexes Cr(CO)5{C(NR2)N = CCl2} 〈 R2 = [CH2]4 (5), MeCH[CH2]3CHMe (7), Et2 (11)〉; with additional amine substitution of a chlorine atom of the isocyanide dichloride group occurs with formation of amino(chloroformamidino)carbene complexes Cr(CO)5{C(NR2)N = C(Cl)NR2} 〈 R2 = [CH2]4 (6), [CH2]2 (8), [CH2]5 (9)〉. The latter are easily hydrolyzed to give carbamoyl isocyanide complexes Cr(CO)5CNC(= O)NR2 〈 R2 = [CH2]5 (10), Et2 (12), [CH2]4 (13)〉. Nucleophilic exchange for the ethylenediamine function NR[CH2]2NR (R = Me, H) of both chlorine atoms in 5 affords the [amino(guanidino)carbene]chromium complexes 16a and 16b. The compounds [bis(ethylthio)-carbene]pentacarbonylchromium (14, side product) and Cr(CO)5{C(SEt)N = C(Cl)SEt} (15, main product) result from 2 and ethanethiol.
    Notes: Die Umsetzung von Pentacarbonyl(trichlormethylisocyanid)-chrom (2) mit den sekundären Aminen Pyrrolidin, 2,6-Dimethylpiperidin und Diethylamin im Verhältnis 1:2 führt zu den [Amino(imino)carben]chrom-Komplexen Cr(CO)5{C(NR2)N = CCl2} 〈 R2 = [CH2]4 (5), MeCH[CH2]3CHMe (7), Et2 (11)〉; mit weiterem Amin erfolgt Substitution eines Chloratoms der Isocyaniddichlorid-Gruppe und Bildung der Amino(chlorformamidino)carben-Komplexe Cr(CO)5{C(NR2)N = C(Cl)NR2} 〈 R2 = [CH2]4 (6), [CH2]2 (8), [CH2]5 (9)〉. Letztere hydrolysieren leicht zu Carbamoylisocyanid-Komplexen Cr(CO)5CNC(=O)NR2 〈 R2 = [CH2]5 (10), Et2 (12) und [CH2]4 (13)〉. [Amino(guanidino)carben]chrom-Komplexe (16a,b) entstehen durch nucleophilen Austausch beider Chloratome in 5 gegen die Ethylendiamin-Funktion NR[CH2]2NR (R = Me, H). Aus 2 und Ethanthiol resultieren die Verbindungen [Bis(ethylthio)carben]-pentacarbonylchrom (14, Nebenprodukt) und Cr(CO)5{C(SEt)N = C(Cl)SEt} (15, Hauptprodukt).
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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