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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 10 (1876), S. 289-317 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 29 (1887), S. 299-317 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 3 (1870), S. 296-322 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 36 (1890), S. 602-602 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 46 (1895), S. 144-158 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 12 (1877), S. 481-484 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 173-175 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The performance of a novel array detector system which can be operated during scanning of the magnetic field of a sector mass spectrometer is investigated. The increase in sensitivity as compared to a standard secondary-electron multiplier slit detector is about 100 times. It is shown that the product of the mass window of the array detector and the resolution is constant. The maximum resolution which can be achieved with the array detector is 7500 full width at half maximum. The solid secondary-ion mass spectrum of 12 attomol of gramicidin S demonstrates the extreme sensitivity of the system.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 3205-3216 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: (tert-Butylimino)[tert-butyl(trimethylsilyl)amino]borane, an Aminoiminoborane, and its ReactionsThe title compound (1b) was prepared by gas-phase elimination of FSiMe3 from the corresponding diaminoborane as a distillable liquid, storable at -30°C, dimerizing at room temperature. Additions to the more unsaturated BN-bond are typical for 1b. Protic reagents are added to give the aminoboranes 3a - c. The aminoboranes 3d - h are formed by ethylo-, azido-, or chloroboration or by azidosilation of 1b, respectively. The chloroboration can be followed by the novel formation of the diazadiboretidines 2e - g. Iminoboranes give a ring closure with 1b, the diazadiboretidines 2b,h being formed. The addition of the CO-bond of aldehydes to 1b yields the oxazaboretidines 4a - c. The [2 + 3]-cycloaddition products 5a,b are isolated by the reaction of 1b with azide- or nitrone-type 1,3-dipolar systems. The borane 1b behaves as a dienophile towards cyclopentadiene with the bicyclic molecule 6 as the product. By X-ray analysis, the central ring-unit of 2f turns out to be a BNBN-rhombus with the acute angles at the N-atoms.
    Notes: Die Titelverbindung (1b) erhält man als destillierbare, bei -30°C lagerfähige, bei Raumtemperatur dimerisierende Flüssigkeit durch Gasphaseneliminierung von FSiMe3 aus dem entsprechenden Diaminoboran. Typisch für 1b sind Additionen an die stärker ungesättigte BN-Bindung. Protonenaktive Stoffe addieren sich zu den Aminoboranen 3a - c. Durch Ethylo-, Azido- oder Chloroborierung sowie durch Azidosilierung erhält man die Aminoborane 3d - h. Die Chloroborierung kann mit einer neuartigen Bildung der Diazadiboretidine 2e - g einhergehen. Iminoborane addieren sich an 1b zu den Diazadiboretidinen 2b,h. Die Addition der CO-Bindung von Aldehyden führt zu den Oxazaboretidinen 4a - c. 1,3-Dipolare Verbindungen vom Azid- bzw. Nitrontyp ergeben die Fünfring-Verbindungen 5a,b. Mit Cyclopentadien reagiert 1b als Dienophil zum Bicyclus 6. Für die Verbindung 2f ergibt sich als zentrale Baueinheit röntgenographisch eine BNBN-Raute mit spitzen Winkeln an den N-Atomen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1954-1964 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Iminoboranes from the Thermal Decomposition of DialkylazidoboranesIminoboranes RB = NR (1a - f) are formed by the thermal decomposition of azidoboranes R2BN3 (5a - f) in the gas phase or in solution. At low temperature, the iminoboranes 1b, d, e (R = iPr, iBu, sBu) can be trapped from the gas phase. They are characterized and brought to reaction as isolated species. Without other reactands, the iminoboranes dimerize or trimerize to form the cyclic products 2 or 3, respectively, or polymerize to the wax-like solids 4. Produced in solution below 100 °C, the iminoboranes are azidoborated by the educts 5 to give the (azidoboryl)amines 6 which are transformed into the borazines 3 at 160 - 180 °C. Iminoboranes undergo an ethyloboration with BEt3, a cycloaddition with PhN3, and in the absence of the strongly reactive R2BN3 a concurring cycloaddition and azidosilation with Me3SiN3 with formation of 7 - 10, respectively.
    Notes: Iminoborane RB = NR (1a - f) entstehen beim thermischen Zerfall von Azidoboranen R2BN3 (5a - f) in der Gasphase oder in Lösung. Die aus der Gasphase abgeschiedenen Produkte 1b, d, e (R = iPr, iBu, sBu) lassen sich bei tiefer Temperatur isolieren, charakterisieren und isoliert umsetzen. Mit sich selbst reagieren die in der Gasphase ergzeugten Iminoborane 1a - f unter Cyclodi-oder -trimerisierung oder unter Polymerisierung zu Produkten von Typ 2, 3 bzw. 4. In Lösung unterhalb 100 °C erzeugt, werden die Iminoborane von den Edukten 5 zu Produkten 6 azidoboriert; diese lassen sich bei 160 - 180 °C in Borazine 3 überführen. Iminoborane erfahren durch BEt3 eine Ethyloborierung zu 7, mit PhN3 eine Cycloaddition zu 8 und mit Me3SiN3 nebeneinander eine Cycloaddition zu 9 und eine Azidosilierung zu 10, sofern nicht das Edukt R2BN3 zugegen ist, das dem Azid Me3SiN3 in der Reaktivität gegenüber 1 überlegen ist.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 346 (1906), S. 354-357 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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