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  • Inorganic Chemistry  (2)
  • Magnesium, active  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Active Magnesium from Catalytically Prepared Magnesium Hydride or from Magnesium Anthracene and its Uses in the Synthesis (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1517-1528 
    Details
    ISSN: 0009-2940
    Keywords: Magnesium anthracene ; Grignard componds ; Magnesium, active ; 1-Oxa-2-magnesiacyclohexane ; Magnesium hydride ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Highly reactive, pyrophoric forms of magnesium with specific surface areas of 20-109 m2/g (Mg*) can be generated by the dehydrogenation of catalytically prepared magnesium hydride (MgH2*) or by decomposition of magnesium anthracene · 3 THF (4). The decomposition of 4, with recovery of anthracene and THF, may be accomplished both thermally and by ultrasound in an organic solvent (toluene, n-heptane) or thermally in the solid state in vacuo. Mg* obtained by the latter method exhibits only weak reflections in the X-ray powder diagram and has, in comparison to other mentioned Mg* species, the highest reactivity toward hydrogen. Diverse Grignard compounds can be prepared under mild conditions (⋜25°C) in THF or ether as well as in hydrocarbons by using Mg* from MgH2* from MgH2* or 4. The cleavage of THF with formation of 1-oxa-2-magnesiacyclohexane (2) is possible by employing Mg* from MgH2* or 4.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230712
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Donor/Akzeptor-substituierte aromatische Systeme, I. Dicarbonyl (η5 -cyclopentadienyl) (1,2,3-triphenylcyclo-propenyl)eisen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 218-233 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Donor/Acceptor Substituted Aromatic Systems, I. Dicarbonyl (η5 -cyclopentadienyl)(1,2,3-triphenylcyclopropenyl)ironDicarbonyl (η5 -cyclopentadienyl)(1,2,3-triphenylcyclopropenyl)iron (13), the structure of which has been determined by X-ray crystallography, is formed from triphenylcyclopropenylium tetra-fluoroborate or bromide and sodium dicarbonyl(cyclopentadienyl)ferrate. With bromine, iodine, tetrafluoroboric acid, trifluoroacetic acid, and triethyloxonium tetrafluoroborate 13 gives triphenylcyclopropenylium salts (12), with hydrogen halides 1,2-diphenylindene (23), with acyl chlorides in the presence of aluminium chloride 3-acyl-1,2-diphenylindenes (25), and with mercuric chlorides hexaphenylbicyclopropene 14. Irradiation of 13 leads to the (oxocyclobutenyl)iron complex 9e and triphenylcyclobutenone (28). Obviously, 13 does not display any properties of a cyclopropenyl anion.
    Notes: Dicarbonyl (η5 -cyclopentadienyl)1,2,3-triphenylcyclopropenyl)eisen (13), dessen Bindungsverhältnisse durch eine Röntgenstrukturanalyse gesichert wurden, entsteht aus Triphenylcyclo-propenylium-tetrafluoroborat oder -bromid und Natrium-dicarbonyl(cyclopentadienyl)ferrat. Mit Brom, Iod, Tetrafluoroborsäure, Trifluoressigsäure und Triethyloxonium-tetrafluoroborat entstehen aus 13 Triphenylcyclopropenylium-Salze (12), mit Halogenwasserstoffsäuren 1,2-Diphenylinden (23), mit Säurechloriden in Gegenwart von Aluminiumchlorid 3-Acyl-1,2-diphenylindene (25) und mit Quecksilberchlorid Hexaphenylbicyclopropen 14. Die UV-Bestrahlung von 13 ergibt einen (Oxocyclobutenyl)eisen-Komplex (9e) neben Triphenylcyclobutenon (28), Offensichtlich weist 13 keine Cyclopropenyl-Anion-Eigenschaften auf.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120120
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    Paper (German National Licenses)
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