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  • 1995-1999
  • 1985-1989  (7)
  • 1987  (7)
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Years
  • 1995-1999
  • 1985-1989  (7)
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    9,12,22,25-Tetramethoxy[7.7]paracyclophan-4,17-dion:Synthese und Molekülstruktur (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 89-91 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Starting from 1,4-bis-(3-iodopropyl)-2,5-dimethoxybenzene (3) via the reaction to the corresponding bis(1,3-dithian-2-yl) compound 4 and its double alkylation by 3 the 22-membered ring system of 5 was obtained from which 9,12,22,25-tetramethoxy[7.7]paracyclophane-4,17-dione (1) was prepared. The molecular structure of 1 is discussed on the basis of an X-ray analysis.
    Notes: Ausgehend von 1,4-Bis(3-iodpropyl)-2,5-dimethoxybenzol (3) wurde über die Reaktion zu der entsprechenden Bis(1,3-dithian-2-yl)-Verbindung 4 und deren erneute doppelte alkylierung durch 3 das 22-gliedrige Ringsystem von 5 aufgebaut, aus dem 9,12,22,25-Tetramethoxy[7.7]paracyclophan-4,17-dion (1) erhalten wurde. Die Molekülstruktur von 1 wird auf der Grundlage einer Röntgen-Strukturanalyse diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200116
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  • 2
    Electronic Resource
    Electronic Resource
    Darstellung und Strukturanalyse eines stabilen 9,10-Anthrachinodimethans (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 93-95 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Starting from 1,4,5,8-tetrachloroanthraquinone by reaction with methyllithium and subsequent elimination 1,4,5,8-tetrachloro-9,10-anthraquinodimethane (1) was obtained. The special stability of this quinodimethane is ascribed to the sterical situation which is discussed on the basis of an X-ray structural analysis of 1.
    Notes: Ausgehend von 1,4,5,8-Tetrachloranthrachinon wurde durch Umsetzung mit Methyllithium und anschließende Eliminierung 1,4,5,8-Tetrachlor-9,10-anthrachinodimethan (1) erhalten. Die besondere Stabilität dieses Chinodimethans wird auf die sterischen Verhältnisse zurückgeführt, die aufgrund der Röntgen-Strukturanalyse von 1 diskutiert werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200117
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  • 3
    Electronic Resource
    Electronic Resource
    Electron donor-acceptor compounds, 44 synthesis, molecular structure, and electron-donor properties of pseudogem-5,8,14,17-Tetrakis(dimethylamino)[3.3]paracyclophane (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 269-273 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Titelverbindung 1, die aus zwei N,N,N′,N′-Tetramethyl-p-phenylendiamin(TMPD)-Einheiten in einem [3.3]Paracyclophan-System besteht, wurde ausgehend von 2 über 3-10 und 13 synthetisiert. Die Molekülstruktur von 1 wird aufgrund einer Röntgen-Strukturanalyse diskutiert. über Elektron-Donor-Eigen-schaften von 1 wird berichtet.
    Notes: The title compound 1 consisting of two N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) units in a [3.3]paracyclophane system has been synthesized starting from 2 via 3-10 and 13. The molecular structure of 1 is discussed on the basis of an X-ray structure analysis. Electron-donor properties of 1 are reported.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200304
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  • 4
    Electronic Resource
    Electronic Resource
    Electron Donor-Acceptor Compounds, 45 Syntheses of [2.2]-, [3.3]-, and [4.4]Paracyclophanes with 1,2,4,5-Tetracyanobenzene Units as Electron Acceptors (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 541-549 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die [2.2]Paracyclophane 1-4, die Tetracyanbenzol(TCNB)-Einheiten gegenüber von verschiedenen Elektron-Donor-Komponenten enthalten, wurden über die entsprechend substituierten Dithia[3.3]paracyclophane 8, 10, 12, und 14. synthetisiert. Für die Pyrolyse der davon abgeleiteten Disulfone 9, 11, 13 und 15 mußte wegen der sehr niedrigen Flüchtigkeit dieser Verbindungen eine Modifikation der konventionellen Pyrolyse-Methode benutzt werden. - Die Synthesen der [3.3]Paracyclophane 16-18 über die Dithia[4.4]paracyclophane 19, 21 und 23 und die entsprechenden Disulfone 20, 22 und 24 und werden beschrieben. Die [4.4]Paracyclophane 32 und 33 wurden aus den betreffenden Dithia[5.5]paracyclophanen 34 und 36 durch Pyrolyse der disulfone 35 und 37 dargestellt. - Als Cyclisierungskomponenten für die Synthese der erwähnten Dithiaparacyclophane wurden verschiedene neue 1,4-Bis(mercaptoalkyl)benzole mit Elektron-Donor-substituenten sowie das TCNB-Derivat 5 dargestellt.
    Notes: [2.2]Paracyclophanes 1-4 containing tetracyanobenzene (TCNB) units opposite to different electron donor components have been synthesized via the corresponding substituted dithia[3.3]paracyclophanes 8, 10, 12, and 14. For the pyrolysis of the disulfones 9, 11, 13, and 15 derived therefrom, due to the very low volatility of these compounds, a modification of the conventional pyrolysis method had to be used. - The syntheses of [3.3]paracyclophanes 16-18 via the dithia[4.4]paracyclophanes 19, 21, and 23 and the corresponding disulfones 20, 22, and 24 are described. [4.4]Paracyclophanes 32 and 33 were prepared from the respective dithia[5.5]paracyclophanes 34 and 36 by pyrolysis of the disulfones 35 and 37. - As cyclisation components for the synthesis of the mentioned dithiaparacyclophanes several new 1,4-bis(mercaptoalkyl)benzenes with electron-donating substituents were prepared as was the TCNB derivative 5.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200414
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  • 5
    Electronic Resource
    Electronic Resource
    Electron Donor-Acceptor Compounds, 46 Molecular Structures and Charge-Transfer Absorptions of [2.2]-, [3.3]-, and [4.4] Paracyclophanes with Tetracyanobenzene as Acceptor Unit (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 551-558 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Molekülstrukturen der Elektron-Donor-Acceptor-[2.2]- und -[3.3]Paracyclophane 1, 2, 4, 6, 10 und 11 werden im Hinblick auf sterische und elektronische Effekte auf der Grundlage von Röntgen-Strukturanalysen diskutiert. Die Charge-Transfer-Absorptionen von 1-9 wurden bestimmt; sie werden in Beziehung zur Variation der Elektron-Donor-Stärke und des Donor-Acceptor-Abstands behandelt.
    Notes: Based on X-ray analyses the molecular structures of the electron donor-acceptor [2.2]- and [3.3]paracyclophanes 1, 2, 4, 6, 10, and 11 are discussed in terms of steric and electronic effects. The charge-transfer absorptions of 1-9 were measured and are dealt with in correlation to the variation of the strength of the electron donors and of the donor-acceptor distances in the series 1-9.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200415
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  • 6
    Electronic Resource
    Electronic Resource
    Chino[7,8-h]chinolin, ein „Protonenschwamm“ neuen TypsNeue „Protonenschwamm“-Verbindungen, 4. Mitteilung. - 3. Mitteilung: [1c]. (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 99 (1987), S. 460-461 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19870990512
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  • 7
    Electronic Resource
    Electronic Resource
    Quino[7,8-h]quinoline, a New Type of “Proton Sponge”New “Proton Sponges,” Part 4. - Part 3: [1c]. (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 26 (1987), S. 460-461 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: So far, “proton sponges” have been defined as bis(dialkylamino)arenes whose dialkylamino groups are in close spatial proximity.[1] The unusual basicity of these compounds is ascribed to the destabilizing overlap of the lone electron pairs on the nitrogen atoms, to the formation of especially strong hydrogen bonds in the monoprotonated diamines, and to the hydrophobic shielding of these hydrogen bonds. In order to differentiate and assess the relative importance of these factors, we were interested in quino[7,8-h]quinoline 1, whose nitrogen atoms exhibit a mutual orientation similar to that in 1,8-bis(dimethylamino)naphthalene 2 (“proton sponge”). In contrast to 2, however, 1 lacks the hydrophobic shielding of the hydrogen bonds of its monoprotonated derivative. This shielding is considered to be responsible for the low rates of proton transfer, which make the “proton sponges” reported so far unsuitable as auxiliary bases in chemical reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198704601
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