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  • 1
    Electronic Resource
    Electronic Resource
    3-Borolene mit diastereotopen Seiten: Synthese von 4-(Dialkylamino)-4-boratricyclo[5.2.1.02,6]dec-2(6)-enen und Struktur des Dimethylamino-Derivats (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1401-1404 
    Details
    ISSN: 0009-2940
    Keywords: 1H-Borole, 2,5-dihydro- ; 4-Boratricyclo[5.2.1.02,6]dec-2(6)-ene ; Bicyclo[2.2.1]heptane, 2,3-dimethylene- ; Bicyclo[2.2.1]heptane, 3-methyl-2-methylene- ; Bicyclo[2.2.1]hept-2-ene, 2,3-dimethyl- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Borolenes with Diastereotopic Faces: Synthesis of 4-(Dialkylamino)-4-boratricyclo[5.2.1.02,6]dec-2(6)-enes and Structure of the Dimethylamino DerivativeTwo syntheses of 2,5-dihyro-1H-borole derivatives with diastereotopic faces are described. 2,3-Dimethylenenorbornane (2) is transformed into the zirconocene complex 5 (≡ Cp2Zr · 2) in a large-scale preparation; 5 reacts with dichloro-(dialkylamino)boranes BCl2(NR2) to give 4-(dialkylamino)-4-boratricyclo[5.2.1.02,6]dec-2(6)-enes 1 (R = Me, iPr). Alternatively, 2,3-dimethylnorbornene (santene) (3) or 3-methyl-2-methylenenorbornane (4) can be kaliated by means of Lochmann-Schlosser base to give a dimetallation product 6 (≡ K2 2); treatment of 6 with BCl2(NR2) also affords the boratricycles 1 (R = Et, iPr). The structure of the dimethylamino derivative 1a has been determined by X-ray diffraction.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270813
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Alcoholysis of Aluminum Alkyls Supported by Bulky Phenoxide Ligands: Synthesis, Characterization, and ε-Caprolactone Polymerization Activity of Two Dimeric Aluminum Isopropoxides (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 441-445 
    Details
    ISSN: 1434-1948
    Keywords: Aluminum ; Alkoxides ; Lactone ; Ring-opening ; Polymerization ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of trialkylaluminum Al2R6 (R = Me, Et) with 2,2′-methylenebis(6-tert-butyl-4-methylphenol) (mbmpH2) gives the dimeric mono(alkyl) complex [Al(mbmp)R]2 with bridging oxygen atoms. Reaction of [Al(mbmp)R]2 with one equiv. of 2-propanol results in the formation of the dimeric isopropoxide [Al(mbmp)(μ-OiPr)]2. Single-crystal X-ray analysis shows a C2h-symmetric structure with a planar Al2O2 core. Monomeric methylbis(2,6-di-tert-butyl-4-methylphenolato)aluminum, AlMe(OC6H2-2,6-tBu2-4-Me)2 (MAD), was found to react with one equiv. of 2-propanol to give a dimeric isopropoxide [AlMe(OC6H2-2,6-tBu2-4-Me)(μ-OiPr)]2 in which the bulky phenolate, instead of the methyl group, has been displaced. According to the single-crystal X-ray structure analysis, the molecule contains a similar Al2O2 core, but the two 2,6-di-tert-butyl-4-methylphenolato ligands are cis- and orthogonally arranged to each other. ε-Caprolactone is polymerized at 50 °C in toluene in a controlled manner by [Al(mbmp)(μ-OiPr)]2, to give poly(ε-caprolactone) with high molecular weights and narrow molecular weight distributions (Mw/Mn 〈 1.50). The low efficiency values (number of polymer chains initiated per aluminum atom) imply that [Al(mbmp)(μ-OiPr)]2 exists in a monomer-dimer equilibrium. The polymerization of ε-caprolactone by [AlMe(OC6H2-2,6-tBu2-4-Me)(μ-OiPr)]2 is faster, but somewhat less controlled.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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