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  • Wiley-Blackwell  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 418 (1975), S. 88-96 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Reactivity of Metal π-Complexes. XIX. Synthesis and Properties of π-Cycloheptadienyl Tungsten ComplexesThe reaction of C7H8W(CO)3 with HBF4 in propionic anhydride leads by protonation of the olefinic ring ligand to give the cation [C7H9W(CO)3]+ which is highly solvated in solution. It reacts smoothly with a number of Lewis bases L to give the corresponding complexes [C7H9W(CO)3L]+ which are isolated as the BF4 salts. With a 1:1 ratio of 1,2-bis(diphenylphosphino)-ethane (P—P) the only observed product is [{C7H9W(CO)3}2(P—P)]2+. The reaction of C7H8W(CO)3 with HCl yields the uncharged compound C7H9W(CO)3Cl. The n.m.r. spectra of the cation [C7H9W(CO)3L]+ and [{C7H9W(CO)3}2(P—P)]2+ which are the first representatives of π-Cycloheptadienyl tungsten complexes are discussed.
    Notes: Die Reaktion von C7H8W(CO)3 mit HBF4 in Propionsäureanhydrid führt unter Protonierung des olefinischen Ringliganden zu [C7H9W(CO)3]+, das in Lösung stark solvatisiert vorliegt. Es reagiert mit einer Reihe von Lewis-Basen L sehr bereitwillig zu den Komplexkationen [C7H9W(CO)3L]+ (L = PPh3, AsPh3, SbPh3, P(OMe)3, P(OPh)3), die als Tetrafluoroborate isoliert werden können. Mit 1,2-Bis(diphenylphosphino)-äthan (P—P) im Molverhältnis 1:1 entsteht ausschließlich der Zweikernkomplex [{C7H9W(CO)3}2(P—P)]2+. Die Umsetzung von C7H8W(CO)3 mit HCl ergibt den Neutralkomplex C7H9W(CO)3Cl. Die NMR-Spektren der Kationen [C7H9W(CO)3L]+ und [{C7H9W(CO)3}2(P—P)]2+, die zugleich die ersten Vertreter von π-Cycloheptadienyl-Wolframverbindungen darstellen, werden diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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