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  • 1
    Electronic Resource
    Electronic Resource
    (Cyclophan-Metall)-Komplexe: Synthese und Kristallstruktur von ([3.3]Paracyclophan)gallium(I)-tetrabromgallat(III) (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 1742-1747 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclophane-Metal Complexes: Synthesis and Crystal Structure of ([3.3]Paracyclophane)gallium(I) Tetrabromogallate(III)[3.3]Paracyclophane forms 1:1 complexes 2a and 2b with both Ga[GaCl4] and Ga[GaBr4]. The crystalline products obtained from toluene solution at room temperature are much less sensitive to air and moisture than most other arene complexes of Ga(I). Solubilities in standard organic solvents are very low, suggesting coordination polymers. The X-ray diffraction analysis of 2b confirms the presence of a two-dimensional network. Both aromatic rings of each cyclophane molecule are η6-coordinated from the outer side to Ga(I)-atoms. The position of these metal cations is 2.75 Å above the ring centres. The arene rings are parallel within each cyclophane, but tilted by 48.5° with respect to those of the neighbouring cyclophane. The coordination sphere of the Ga(I) centres is completed by two Br-atoms of two GaBr4- anions, which link the Ga(I) cations to give … Ga[GaBr4] Ga[GaBr4]Ga … strands. The double interconnection of the Ga(I)-atoms gives rise to a two-dimensional sheet structure, which is thus different from the structure of the previously described Ga[GaBr4] complex of [2.2]paracyclophane, where a three-dimensional network was observed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690731
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclopropylidenebis(diphenylphosphine): Note on its Synthesis, Properties and Spectral Data (1984)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 67 (1984), S. 2175-2177 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The title compound has been synthesized through cyclopropanation of vinylidenebis(diphenylphosphine) using dimethylsulfoxonium methylide. It is easily converted into its dioxide and disulfide. NMR data of these first geminal diphosphinocyclopropanes are presented.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19840670818
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  • 3
    Electronic Resource
    Electronic Resource
    2,3-Bis(diphenylphosphino)-1,3-butadien (1987)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 70 (1987), S. 1905-1910 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,3-Bis(diphenylphosphino)-1,3-butadieneA method for synthesis of the title compound is described, using the readily available 2,3-bis(diphenylphosphinoyl)-1,3-butadiene (1) as the starting material. For the protection of the diene system, 1 is first converted into the 1,4-dibromo- and 1,4-dichloro derivatives 2a and b, respectively, by addition of Br2 or Cl2, respectively. The structure of 2b has been determined by single-crystal X-ray diffraction. The molecule has a centrosymmetrical (E)-configuration. Reduction of the phosphinoyl groups by HSiCl3(to give the bis(diphenylphosphino)compound 3), followed by removal of the Cl-atoms using Zn powder, affords the bis(diphenylphosphino)butadiene 4. Compounds 3 and 4 give quaternary phosphonium salts 5 and 6, respectively, on addition of CH3OSO2F or CH3I. The sulfur analogue of 1 is formed on treatment of 4 with elemental sulfur.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19870700725
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese und Struktur zweier Gold-Komplexe des Triphenylphosphonium-[bis(diphenylphosphino)methylids] (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 1748-1756 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Structure of Two Gold Complexes of Triphenylphosnium [Bis(diphenylphosphino)methylide]Triphenylphosphonium [bis(diphenylphosphino)methylide] (1) reacts with 1 or 2 equiv. of (CO)AuCl in a solvent to give mono- or binuclear Au(I) complexes 2 or 3, respectively. The Au-atoms are bound exclusively to P-atoms, and the ylidic C-atom remins an uncoordinated link between the three P-atoms. Contrary to findings with the free ligand 1, 31P-NMR spectra of 3 are in agreement with free P—C bond rotation in solution. 197Au-Mössbauer data for both complexes indicate the presence of Au(I) centers in a very similar environment. X-Ray structure analysis shows that the basic geometry of the free ligand is essentially retained in the complexes. Apart from the different degree of complexation, the structures of 2 and 3 differ only slightly in the conformation of the phenyl rings.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690732
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