Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of natural products 48 (1985), S. 837-840 
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 459 (1985), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-2307
    Keywords: Midline granuloma ; Histochemistry ; B cell NHL ; T cell NHL ; Malignant histiocytosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present report describes the results of a combined morphological, enzyme- and immunohistochemical analysis of nine cases of malignant non Hodgkin's lymphomas (NHL) clinically presenting as lethal midline granuloma. In a previous report written before antibodies directed against B and T lymphocytes were available, a histiocytic origin of such neoplasms had been suggested. A panel of antibodies reactive with most B cells (L26, MB1, KiB3) and a majority of T cells (MT1, UCHL1) was applied on paraffin sections of formalin fixed tissues as well as antibodies directed against leukocyte common antigen (LCA), myeloid/histiocyte antigen (MAC 387), lysozyme, alpha-1-antitrypsin, alpha-1-antichymotrypsin, S-100 protein, prekeratin and immunoglobulin light chains. Enzyme histochemistry included tests for non-specific acid esterase, acid phosphatase, betaglucuronidase and chloroacetate esterase. As a result, five T, two B and two unclassified (malignant histiocytosis probable) NHL were identified, indicating distinct heterogeneity of NHL as causative disorders in lethal midline granuloma.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1302-1306 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus 3-Amino-1.2.4-triazol wird mit Acetylchlorid bei Raumtemperatur eine Monoacetylverbindung A erhalten, die nicht identisch ist mit dem Monoacetylderivat B, das bei der Neutralhydrolyse der Diacetylverbindung entsteht. Bei höherer Temperatur findet eine Acyl-Umlagerung A → B statt, die IR-spektroskopisch verfolgt wurde. Entsprechende Verhältnisse wurden bei den Benzoylderivaten beobachtet. Die Struktur der Mono- und Diacylderivate des 3-Amino-1.2.4-triazols wird auf Grund der IR-Spektren und der Reaktionseigenschaften dieser Verbindungen diskutiert.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 89-91 
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1254-1260 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electron Donor-Acceptor Compounds, XL. Theoretical Explanation of Charge-Transfer Absorptions of syn- and anti-Donor-Acceptor MetacyclophanesThe similarity of charge-transfer absorptions which in spite of the very different donor-acceptor arrangement has been observed for syn-anti isomeric donor-acceptor metacyclophanes (1-4) is explained by the aid of simple theoretical considerations.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1204-1229 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electron Donor-Acceptor Compounds, XXXVIII. Electron Donor-Acceptor [2.2]Metacyclophanes: Synthesis, Structure, and Charge-Transfer SpectraDonor-acceptor [2.2]metacyclophanes 1-4 as well as 24 were synthesized via the correspondingly substituted 2,11-dithia[3.3]metacyclophanes 8, 13, and 25 and their disulfone derivatives. The anti-compound 1 and the syn-isomer 2 were isolated and characterized. The attempt of the analogous synthesis of 5/6 via 21 and 22 failed since with loss of the intraanular substituents and by transanular C — C formation the tetrahydropyrene derivative 23 was formed. For spectroscopic comparison 27 was prepared via 28. - X-Ray structure analyses of 21, 24, and 25 were performed. The molecular structures of these compounds are discussed under the aspects of sterical strain and donor-acceptor overlap. The structure analyses confirm the assignment to the syn- and anti-series as derived from 1H NMR. - Absorption spectra of 1, 2, 3, and 24 were measured; especially the surprising absorption behaviour of the isomers 1 and 2 with very different donor-acceptor overlap was of interest. Determination of the solvent dependence of fluorescence made sure that the absorptions dealt with are indeed charge-transfer transitions.
    Notes: Donor-Acceptor-[2.2]Metacyclophane 1-4 sowie 24 wurden über die entsprechend substituierten 2,11-Dithia[3.3]metacyclophane 8, 13 und 25 und die davon abgeleiteten Disulfone synthetisiert. Die anti-Verbindung 1 und das syn-Isomere 2 konnten isoliert und charakterisiert werden. Der Versuch der entsprechenden Synthese von 5/6 über 21 und 22 schlug fehl, da unter Verlust der intraanularen Substituenten und transanularer C — C-Verknüpfung das Tetrahydropyren-Derivat 23 entstand. Für spektroskopische Vergleichszwecke wurde 27 über 28 dargestellt. - Röntgen-Strukturanalysen von 21, 24 und 25 wurden ausgeführt. Die Molekülstruktur dieser Verbindungen wird unter den Aspekten der sterischen Spannung und der Donor-Acceptor-Überlappung diskutiert. Die Strukturanalysen bestätigen die aus 1H-NMR-Daten abgeleiteten Zuordnungen zu den syn- und anti-Reihen. - Die Absorptionsspektren von 1, 2, 3 und 24 werden angegeben, wobei besonders das überraschende Absorptionsverhalten der Isomeren 1 und 2 mit sehr unterschiedlicher Donor-Acceptor-Überlappung interessierte. Die Bestimmung der Lösungsmittel-Abhängigkeit der Fluoreszenz ergab, daß es sich bei den behandelten langwelligen Absorptionen tatsächlich um Charge-Transfer-Absorptionen handelt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 796-813 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektron-Donor-Acceptor-Verbindungen, XXXVI Chinone und Chinhydrone der [2.2]- und [3.3]Metaparacyclophan-ReihenDie isomeren Chinhydrone 1 und 2 sowie das Bis(chinon) 6 der [2.2]Metaparacyclophan-Reihe wurden synthetisiert. Vorstufe dieser Verbindungen war das Tetramethoxy[2.2]metaparacyclophan 3, das über 4 und 5 dargestellt wurde. Röntgen-Strukturanalysen von 1, 3 und 6 werden im Hinblick auf die sterische Spannung dieser Moleküle und die Donor-Acceptor-Orientierung in 1 diskutiert. Charge-transfer-Absorptionen von 1 und 2 werden ebenso behandelt wie der Circulardichroismus von 1, das in Enantiomere getrennt werden konnte.  -  Auf analogem Wege wurden die isomeren Chinhydrone 13 und 14 sowie das Bis(chinon) 15 der [3.3]Metaparacyclophan-Reihe dargestellt. Der Unterschied in der sterischen Spannung zwischen den [3.3]- und [2.2]-Metaparacyclophan-Reihen wird auf der Grundlage der Röntgen-Strukturanalyse von 13 diskutiert. Charge-transfer-Absorptionen von 13 und 14 werden angegeben.
    Notes: The isomeric quinhydrones 1 and 2 as well as the bis(quinone) 6 of the [2.2]metaparacyclophane series were synthesized. Precursor of these products was the tetramethoxy[2.2]metaparacyclophane 3 which was prepared via 4 and 5. X-ray structure analyses of 1, 3 and 6 are discussed with regard to the steric strain in these molecules and the donor-acceptor orientation in 1. Charge-transfer absorptions of 1 and 2 are reported as well as circular dichroism of 1 which was separated into enantiomers.  -  Following an analogous route the isomeric quinhydrones 13 and 14 as well as the bis(quinone) 15 of the [3.3]metaparacyclophane series were prepared. The difference in steric strain of the [3.3]- in comparison to the [2.2]metaparacyclophane series is discussed on the basis of an X-ray structure analysis of 13. Charge-transfer absorptions of 13 and 14 are reported.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 93-95 
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 269-273 
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...