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  • 1
    Electronic Resource
    Electronic Resource
    Formation of a Stable Cyclopropenylium Betaine (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 5853-5854 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00126a026
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Zirconocene-(μ-Organyl)borate Betaines Derived by Treatment of a (σ-Alkenyl)(σ-alkynyl)zirconocene Complex with Tris(pentafluorophenyl)borane⋆ (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 889-895 
    Details
    ISSN: 1434-1948
    Keywords: Zirconocene ; Metallocene cation ; Isonitrile insertion ; Isonitrile complex ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrozirconation of propyne followed by treatment with propynyllithium yields the (σ-propenyl)(σ-propynyl)zir-conocene complex 11. Its treatment with the organometallic Lewis acid B(C6F5)3 results in transfer of the σ-propynyl group from zirconium to boron followed by insertion of the alkynylborate triple bond into the zirconium carbon bond of the remaining metallaallyl cation to furnish the zirconocene-(μ-hydrocarbyl)borate betaine complex 14. This reacts with three molar equivalents of tert-butyl isocyanide to give 16. Complex 16 contains a five-membered carbocyclic ring, formed by carbon-carbon coupling of the former propenyl and propynyl groups with the C≡N-R reagent, to which a (η2-iminoacyl)(ĸ-tert-butyl isocyanide)zirconocene moiety is attached. Complex 16 was characterized by an X-ray crystal structure analysis.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Characteristic Features of Neutral Cyclopropenylium-Like Compounds: Synthesis, Structure, and Chemical Behavior of a Cyclopropenylioborate Betaine (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1079-1084 
    Details
    ISSN: 0009-2940
    Keywords: Cyclopropenylium compounds ; Methylenecyclopropenes ; Isonitrile insertion ; Methylenecyclobutenone imine derivatives ; Cyclopropenylioborate betaines ; C-C coupling ; Zirconium ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(propynyl)zirconocene was treated with B(C6F.5)3 and then with two equivalents of tert-butyl isocyanide to yield the organometallic three-membered ring product 8. Subsequent hydrolysis gives the substituted (2-iminioethylidene)cyclopropeneborate betaine system 9 that exhibits a pronounced cyclopropenylioborate betaine character. This follows from its characteristic structural features (X-ray crystal-structure analysis of the isomer cis-9) and its chemical features. Complex 9 undergoes a very facile cis/trans isomerization by formal rotation around the exocyclic partial CC-double bond (ΔG+ ≈ 17 kcal mol-1). Compound 9 reacts cleanly in methanol solution with tert-butyl isocyanide by insertion and ring enlargement to form the four-membered ring system 12. Compound 12 was also characterized by X-ray diffraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300809
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    Paper (German National Licenses)
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