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  • 1985-1989  (1)
  • Isolobal building blocks  (1)
  • Crystal Structures
  • 1
    ISSN: 0009-2940
    Keywords: Phosphamolybdacyclopropanes ; Isolobal building blocks ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal-Containing Heterocycles: Preparation, Properties, Reactions, LXIII. - Phosphamolybdacyclopropanes with Carbene and Phosphinidene Building BlocksThe phosphidomolybdate (1) {[Mo] = (η5-C5H5)Mo(CO)2} reacts with the geminal dihalides RCHCl2 (2a-c) [R = H (a), Me (b), Ph (c)] and the organophosphorus chlorides RPCl2 (4b-d) [R = 2,4,6-(tBu)3C6H2 (d)] to give the three-membered phosphamolybdacyclopropanes (3a-c) and (5b-d), respectively. The activation parameters ΔG≠ for the rotation of the P-C unit are independent of the substituent R, based on temperature-dependent 1H-NMR spectra of 3a-c. According to an X-ray structural analysis 5c crystallizes in the triclinic space group P1 with Z = 4. Compared to a single bond the P—P distance (211 pm) in 5c is shorter. the complexes (OC)5MTHF are added to the Lewis basic phosphinidene phosphorus in 5c with loss of THF giving (6c-8c) [M = Cr (6), Mo (7), W (8)].
    Notes: Das Phosphidomolybdat (1) {[Mo] = (η5-C5H5)Mo(CO)2} reagiert mit den geminalen Dihalogeniden RCHCl2 (2a-c) [R = H (a), Me (b), Ph (c)] und Organophosphorchloriden RPCl2 (4b-d) [R = 2,4,6-(tBu)3C6H2 (d)] zu den dreigliedrigen Phosphamolybdacyclopropanen (3A-c) bzw. (5b-d). Aus temperaturabhängigen 1H-NMR-Spektren von 3a-c ergeben sich die Aktivierungsparameter ΔG≠ für die Rotation der P—C-Einheit, die unabhängig vom Substituenten R sind. 5c kristallisiert laut Röntgenstruktur-analyse in der triklinen Raumgruppe P1 mit Z = 4. Der P—P-Abstand in 5c ist mit 211 pm gegenüber einer Einfachbindung verkürzt. An den Lewis-basischen Phosphiniden-Phosphor in 5c addieren sich unter THF-Verlust die Komplexe (OC)5MTHF unter Bildung von (6c-8c) [M = Cr (6), Mo (7), W (8)].
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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