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  • Inorganic Chemistry  (22)
  • 51  (2)
  • 71.55.Fr  (2)
  • Allyl cations  (2)
  • 1
    ISSN: 1432-0630
    Keywords: 51 ; 84
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The trajectories of para-and ferromagnetic particles with velocities between 0.04 and 2.5 cm s−1 have been investigated in an HGMS model system with axial configuration. A single-wire system has been observed by a TV system. The trajectories were compared with the ideal (inviscid flow) and laminar (viscous flow) model. The results agree with laminar flow model.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0630
    Keywords: 71.55.Fr ; 72.80.Cw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The free-electron concentration as a function of the temperature is analyzed differentially for silicon with oxygen-related donors formed by annealing at 430 °C. The analysis yields defect levels atE c−0.25 eV,E c−0.14eV, andE c−0.055 eV assuming the degeneracy factors to be unity. The corresponding defect level concentrations are approximately proportional to the annealing time. Their formation rates are between 1 and 3×1010cm−3s−1 at 430 °C annealing temperature.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 24 (1981), S. 225-228 
    ISSN: 1432-0630
    Keywords: 51 ; 84
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The observation of a large number of particle trajectories in a transversi single wire HGMS has made possible the experimental determination of the critical capture radius. Both the trajectories and the capture radius were found to be in good agreement with calculated values obtained by numerical means using a laminar flow model.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 27 (1982), S. 39-47 
    ISSN: 1432-0630
    Keywords: 71.55.Fr ; 72.80.Cw ; 71.45.Gm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The free charge carrier concentration as a function of the reciprocal temperature and the doping level [p(1/T)- andp(C)-characteristics] is calculated from the neutrality equation of a semiconductor containing positive or negativeU centers. The typical exponential laws and power laws of thep(1/T)- andp(C)-characteristics are given both for positive and negative correlation energy of the bound charge carrier pairs. Furthermore, the characteristics are evaluated differentially, in order to obtain criteria for the presence of negativeU centers in semiconductors.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hochalkylierte Cyclohexane. - Röntgenstrukturanalyse, Kraftfeld-Berechnungen und Konformationen von cis/trans-1,4-disubstituierten Cyclohexan-IsomerenDie Struktur von mesyliertem cis- und trans-Tetramethylshisool cis-2 und trans-2 wurde durch Einkristall-Röntgenmethoden aufgeklärt. In cis-2 nimmt die Isopropenylgruppe im Kristall eine axiale Stellung ein, und die erhaltenen Strukturdaten stehen in gutem Einklang mit Kraftfeldberechungen. In trans-2 wurden zwei Rotamere, die durch Rotation der Isopropenylgruppe entstehen, durch NOE-Messungen zugeordnet. Der Vergleich der spektroskopischen Daten mit denen anderer Tetramethyllimonenderivate zeigt, daß diese in Verbindungen mit bevorzugt äquatorialer und bevorzugt axialer Lage der Isopropenylgruppe eingeordnet werden können.
    Notes: The structures of mesylated cis- and trans-tetramethylshisool cis- 2 and trans-2 have been elucidated by single-crystal X-ray techniques. In cis-2 the isopropenyl group adopts an axial position in the crystal, and the structural data obtained are in good agreement with those from force-field calculations. In trans-2 the two rotamers arising from rotation of the isopropenyl group were assigned by NOE measurements. Comparison of the spectroscopic data with those of other tetramethyllimonene derivatives showed that these can be classified into compounds with preferred equatorial and preferred axial position of the isopropenyl group.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2147-2147 
    ISSN: 0009-2940
    Keywords: Tricyclo[3.3.0.03,7]octanes ; Samarium iodide ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,5-Dimethylbicyclo[3.3.0]octan-3,7-dione (2) was converted into 1,5-dihydroxy-3,7-dimethyltricyclo[3.3.0.03,7]octane (3) in the presence of Sml2 in 76% yield.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3880-3885 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesen von α,β-ungesättigten und anderen reaktiven AcylcyanidenReaktive aliphatische Acylcyanide (1-10, siehe Tab. 1) werden aus Acylchloriden, Natriumiodid und Kupfer(I)-cyanid unter verschiedenen Bedingungen dargestellt. Die Reaktion verläuft über die Acyliodide.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 3325-3329 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,2,4,4-Tetramethyl-3-methylenbicyclo[3.2.1]oct-6-enDie sterisch anspruchsvolle Titelverbindung 1 wurde in einer Eintopfreaktion aus Cyclopentadien und 2,4-Dimethyl-3-[(trimethylsilyl)methyl]-3-penten-2-ol (5) in Gegenwart von Titantetrachlorid/N-Methylanilin hergestellt. 2,2,4,4-Tetramethylbicyclo[3.2.1]oct-6-en-3-on (4) wurde vereinfacht im 15-g-Maßstab dargestellt.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 1256-1258 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eine neue Darstellung von Dehydrocamphenilon und CamphenilonBenzilsäureumlagerung von Dehydrocarbocamphenilon (4) ergibt die α-Hydroxysäure 5, welche mit Bleitetraacetat oxidativ zu Dehydrocamphenilon (2) decarboxyliert wird. Die gleiche Reaktionsfolge führt von Carbocamphenilon (9) zu Camphenilon (3).
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1501-1506 
    ISSN: 0009-2940
    Keywords: Resorcinols, methoxy-, monoprotected ; Iodination, mild ; Iodobenzenes, electron-rich ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A range of mono- and diiodinated phloroglucinols with differential protection of two hydroxy groups has been prepared.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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