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  • Organic Chemistry  (13)
  • Life and Medical Sciences  (2)
  • 1-phosphabicyclo[4.3.0]nonanes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Lanthanid-Komplexe mit schneller Z/E-Isomerisierung des 3-AcetyltetramsäureligandenHerrn Prof. Dr. Rolf Borsdorf zum 60. Geburtstag gewidmet (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 179-180 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lanthanide-Complexes with Rapid Z/E-Isomerisation of the 3-Acetyltetramic Acid Ligand
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340215
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of Schiff Base Chelates of Tetramic Acids as NMR Contrast Agents for micro imaging (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 642-646 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel Cu(II) complexes derived from N,N′ P-ethylene-bis-(1′,5′,5′-trimethyltetramic acid-3′-acetiminato)copper(II) aCu [1] were evaluated as contrast agents for NMR microscopy and therefore tested for penetration into living cells (Xenopus laevis oocytes). By in vitro 1H NMR relaxation (T1) and atomic absorption spectroscopy measurements (AAS) we confirmed, that independent of the complex isomers (Z/Z, Z/E, E/E, E/Z) compounds with alkyl substituents in R1 - R5 exclusively were able to penetrate the plasma membranes. It is noteworthy that compounds containing the tetramic acid moieties from both a penetrating and a non-penetrating complex most likely were accumulated in the plasma membrane and/or plasma membrane-associated vesicles, which was concluded from in vitro NMR measurements combined with AAS trace analyses. In this context the crystal and molecular structure of the ‘chimerical’ C17H22N4O4Cu · 3H2O kCu · 3H2O were determined by x-ray analysis. The x-ray structural parameters are discussed in detail.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.199633801122
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  • 3
    Electronic Resource
    Electronic Resource
    1,5-Sigmatropic shifts of bromine over a cyclopentadiene ring (1991)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 4 (1991), S. 31-47 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The intrinsic mechanism of circumambulatory rearrangements of 5-bromo-5-methyl-1,2,3,4-tetramethoxycarbonylcyclopentadiene, 5-bromo-1,2,3,4 5-pentamethoxycarbonylcyclopentadien and 5-bromo- 1,2,3,4,5-pentaphenylcyclopentadiene due to sigmatropic shifts of bromine over the cyclopentadiene ring was proved, using the dynamic 13C and 1H NMR technique, to be governed by successive intramolecular 1,5-sigmatropic shifts. Semi-empirical AM1 and MINDO/3 calculations of reactions paths performed for fluoro-, chloro- and bromocyclopentadienes are in accord with the conclusion of a preference for a 1,5- over a 1,3-shift reaction path of halogen migration over a cyclopentadiene system. Intramolecular 1,5-sigmatropic shifts of chlorine in 5-chloro-5-methyl-1,2,3,4-tetramethoxycarbonylcyclopentadiene with the free energy barrier of ΔG298+ = 26.1 kcal mol-1 were studied using 1H NMR spectroscopy.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610040107
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Regio- und Stereoselektivität nucleophiler Thioladditionen an PolyineHerrn Prof. Dr. Rolf Borsdorf zum 60. Geburtstag gewidmet (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 141-146 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Regio- and Stereoselectivity of Nucleophilic Thiol Additions to PolyinesNucleophilic thiophenol additions to α,ω-diphenyl polyines Ph-(C≡C)n-Ph (n = 2-4) (1-3) take a regio- and stereoselective course. The well-defined, crystalline addition products bind the phenylthio group in terminal position of the aliphatic chain, the resulting C, C-double bonds of the mono-(4, 6, 8) and bis-addition products (5, 7, 9) are (Z)-configurated, as unequivocally proved by 13C-n.m.r. analysis.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340208
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  • 5
    Electronic Resource
    Electronic Resource
    Cell cycle and cyclic AMP-dependent phosphorylation of plasma membrane proteins p14 and p24: Defects in smooth surface transformed cells (1983)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 23 (1983), S. 203-209 
    Details
    ISSN: 0730-2312
    Keywords: cell cycle ; cytoplasmic plasma membrane surface ; control of cell proliferation ; proadipocyte stem cells ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Two proteins which are localized to the cytoplasmic surface of the plasma membrane, p14 and p24, undergo cyclic AMP-dependent phosphorylation in rapidly growing nontransformed murine embryo cells. In this cell system, growth arrest in the G1 phase of the cell cycle induced by growth factor deprivation is associated with the reversible loss in ability to phosphorylate these substrates. By contrast Simian virus 40 and methylcholanthrene transformed cells show both defective G1 growth control and defects in their ability to phosphorylate p14 and p24 under all tested growth conditions. These data suggested a correlation between defects in the physophorylation of p14 and p24 and defects in the ability of transformed cells to G1 growth arrest. The results of the current studies by contrast show that 3T3 T proadipocytcs which have been transformed by the smooth surface tumorigenesis method show different characteristics. They retain the ability to G1 growth arrest in serum-deficient medium. They show cyclic AMP-dependent phosphorylation of p14 and p24 during exponential growth. They do not, however, down regulate p14 and p24 phosphorylation in association with G1 growth arrest. These observations suggest that neoplastic transformation is not necessarily associated with absolute defects in the ability to phosphorylate p14 and p24. Rather, the results of the current study suggest that the inability to modulate the cyclic AMP-dependent phosphorylation of plasma membrane p14 and p24 proteins during the G1 phase of the cell cycle may be more tightly associated with neoplastic transformation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240230117
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  • 6
    Electronic Resource
    Electronic Resource
    7· und 8-Ringverbindungen. X. Benzolinduzierte Verschiebungen in den H1-NMR-Spektren der Alkylcycloheptanone (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 296-301 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An 12 Alkylcycloheptanonen wurde die Verschiebung der Protonensignale im Kernresonanzspektrum beim Übergang vom Lösungsmittel CDCl3 zu C6H6 untersucht. Die erhaltenen Ergebnisse lassen sich zur Konformation der Cycloheptanone in Beziehung setzen und weisen auf das Vorliegen dieser Verbindungen als axialsymmetrische Sesselkonformation hin.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110215
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  • 7
    Electronic Resource
    Electronic Resource
    Tautomere 3-Acetyltetramsäurederivate - 1H/13C-NMR-Untersuchung (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 319-324 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tautomeric 3-Acetyltetramic Acid Derivatives -1H/13C-n.m.r.-InvestigationThe molecular structure of 1,5,5-trimethyl-3-acetyltetramic acid (I) and its Schiffbases with ethylendiamin (II) and 1,3-diaminopropan-2-ol (III) is described by an equilibrium of four tautomers. The solvent dependence of the equilibrium is attributed to the strength of the intramolecular hydrogen bond. The higher proton affinity of the Schiff-bases (II and III) in comparison with the ketone (I) should be responsible for the faster equilibration of II and III.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320307
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  • 8
    Electronic Resource
    Electronic Resource
    Spektrale Eigenschaften einiger Glucopyranoside und 2-Desoxyribofuranoside tautomeriefähiger π-Mangel-Heteroaromaten (1971)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 614-625 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Titelverbindungen wurden NMR-, UV- und CD-spektroskopisch untersucht. An Hand der chemischen Verschiebung der Protonen des Zuckerrestes wurde für alle untersuchten N-β-D-Glucopyranoside eine anti-Konformation nachgewiesen. Das Vorzeichen der Cotton-Effekte der Glucopyranoside und Desoxyribofuranoside hängt außer von der Konfiguration wesentlich von der Struktur des Aglykons ab. Veränderungen in unmittelbarer Nähe des glykosidischen Stickstoffatoms (6-Azathymin- und Pyridazon-(3)-Derivate) führen zu einer Umkehr des Vorzeichens der Cotton-Effekte.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19713130409
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  • 9
    Electronic Resource
    Electronic Resource
    7- und 8-Ringverbindungen. XII. Konfigurations- und Konformationszuordnung der Cis/trans-isomeren tert.-Butylcycloheptanole (1970)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 312 (1970), S. 318-325 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An den 6 cis/trans-isomeren 2-, 3- und 4-tert.-Butylcycloheptanolen wird der Zusammenhang zwischen Konfiguration und Konformation auf theoretischem Wege bestimmt. Danach und in Übereinstimmung mit Konfigurations- und Konformationsuntersuchungen durch IR-Spektroskopie, mit Hilfe der BARTONschen Regeln und der Äquilibrierungsgleichgewichte zeigt sich, daß bei den 2- und 4-tert.-Butylcycloheptanolen der Anteil der Konformationen mit quasi-axialer Hydroxylanordnung im cis- größer als im trans-Isomeren ist. In den 3-tert.-Butylcycloheptanolen ist dagegen in der trans-Konfiguration die quasi-axiale Hydroxylanordnung stärker als in der cis-Konfiguration vertreten. Die AUWERS-SKITA-Regel erweist sich als nicht geeignet zur Konfigurationszuordnung.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19703120218
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  • 10
    Electronic Resource
    Electronic Resource
    Trennung und Zuordnung der isomeren Dipropylenglykole-(1,2) (1976)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 1031-1037 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Separation and Identification of the Isomers of Di-1,2-propyleneglycolThe structural isomers of di-1,2-propyleneglycol are separated by means of gaschromatography. The structural and stereoisomeric forms are distinguished and identified by n.m.r. spectroscopy (1H and 13C) and mass-spectrometry.
    Notes: Die vom Dipropylenglykol-(1,2) möglichen strukturisomeren Formen werden gaschromatographisch getrennt. Die Strukturisomere und Diastereomere werden mit Hilfe der 1H-NMR-Signale der Methylgruppen sowie durch 13C-NMR- und Massenspektroskopie unterschieden und zugeordnet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19763180619
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