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  • Chemistry  (48)
  • Analytical Chemistry and Spectroscopy  (7)
  • Life and Medical Sciences  (2)
  • 1
    ISSN: 1434-1948
    Keywords: Crystal structure ; Solution structure ; Homodinuclear lanthanide complexes ; Lanthanides ; Macrocyclic ligands ; Polyamine polycarboxylic acid ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solid-state structures of the four homodinuclear chelate complexes, [Na2(Y2OHEC)(H2O)2] · 7 H2O · C2H5OH (1), [Na2(Gd2OHEC)(H2O)2] · 12 H2O (2), [Na2(Eu2OHEC)(H2O)2] · 11 H2O (3), and [Cs2(La2OHEC)(H2O)2] · 14 H2O (4) (H8OHEC = 1,4,7,10,14,17,20,23-octaazacyclohexacosane-1,4,7,10,14,17,20,23-octaacetic acid), were determined by X-ray crystal structure analysis. Each lanthanide(III) ion is ninefold coordinated by eight donor atoms of the ligand system and the oxygen atom of one water molecule. The structures are compared with those of DOTA- and TETA-coordinated complexes and the conformation of the OHEC ligand system with that of the parent amine and its dinuclear copper complex. NMR investigations of the diamagnetic complex 1indicate a very similar environment of the lanthanide cations in solution and in the solid state. Low-temperature and variable-temperature 1H-NMR measurements prove the existence of two isomers of 1 (3.5:1 ratio) which undergo conformational processes. The rate constants of these processes were deduced from a complete line shape analysis and were used to determine the activation parameters.Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2005/1999/99081_s.pdf or from the author.
    Additional Material: 6 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 319-324 
    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.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 380-388 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Reaction of 5,6-Dihydro-1,4-oxathiin-4,4-dioxides with Nucleophilic CompoundsBy reactions of 5,6-dihydro-1,4-oxathiin-4,4-dioxides (1, 5, 8) with thioles, amines and CH-acid compounds 2-substituted ethansulfonylcarbonyl compounds are formed. The structures of the reaction products are determined by elemental analysis, i.r. and 1H-n.m.r.-spectroscopy.5,6-Dihydro-1,4-oxathiin-4,4-dioxide sind gut zugänglich durch die Oxidation von 5,6-Dihydro-1,4-oxathiinen mit Wasserstoffperoxid. Besonders zur Darstellung der 5,6-Dihydro-2-methyl-3-carboxamido-1,4-oxathiin-4,4-dioxide, von denen einige im Pflanzenschutz wegen ihrer systemischen fungiziden Wirkung Bedeutung erlangten, wurden verschiedene Methoden beschrieben [1, 2]. In ähnlicher Weise lassen sich auch die entsprechenden Ester und Säuren synthetisieren.
    Additional Material: 1 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 656-660 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N.M.R.-Investigation of the Intramolecular Hydrogen-Bonds in 2-Hydroxy-nitronate-anions
    Additional Material: 4 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 121 (1984), S. 357-367 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The plasma membrane of 3T3 cells contains at least two different endogenous cyclic AMP-dependent protein kinase systems. One catalyzes the phosphorylation of endogenous protein substrates, i.e., PP24 and PP14, whereas the other catalyzes the phosphorylation of exogenous substrates. In this paper the topography of these cyclic AMP-dependent phosphorylation systems is described. The results show that the kinases which phosphorylate only exogenous substrates are primarily localized to the outer plasma membrane surface whereas the endogenous cyclic AMP-dependent protein kinase and its two endogenous substrates are localized to the cytoplasmic plasma membrane surface. The data also establish that neither the cytoplasmically orientated kinase nor its substrates has a transmembrane orientation even though factors acting on the outer plasma membrane can affect these proteins. This suggests that functional modulation of the cytoplasmically localized cyclic AMP-dependent phosphorylation system can be mediated by a transmembrane regulatory mechanism. The importance of determining the topography of such plasma membrane phosphorylation systems is emphasized by recent studies which show that neoplastic transformation can be mediated at least in part by protein kinases and/or phosphoproteins which are localized on the cytoplasmic surface of the plasma membrane.
    Additional Material: 6 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 1011-1015 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H- and 13C-N.M.R. Investigations of N-Acyl-imino-dithiocarbonic-S,S-dimethylester
    Additional Material: 3 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 483 (1981), S. 145-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Coordination Chemistry of Zinc Dialkyls. XVI. Synthesis and Investigation of Dinorbornyl Zinc CompoundsBis(1-norbornyl)-, bis(2-norbornyl)-, and bis(7-norbornyl)zinc were synthesized from zink chloride and the corresponding Grignard compounds or norbornyl lithium compounds, respectively. The properties of these compounds differ remarkably. A detailed characterization took place by the mass, IR and 13C-NMR spectra and by investigation of the thermal decomposition and complex formation reactions.For comparison the bis(7-norbornenyl)zinc was prepared and characterized.
    Notes: Bis(1-norbornyl)-, Bis(2-norbornyl)- und Bis(7-norbornyl)-zinkNorbornyl = Bicyclo-[2.2.1]-heptyl, (Nor). wurden aus Zinkchlorid und den entsprechenden Grignardverbindungen bzw. Norbornyllithiumverbindungen synthetisiert. Die drei Substanzen unterscheiden sich beträchtlich in ihren Eigenschaften. Eine nähere Charakterisierung erfolgte durch Aufnahme und Auswertung der Massen-, IR- und 13C-NMR Spektren sowie durch Untersuchung des thermischen Zerfalls und von Komplexbildungsreaktionen.Für Vergleichszwecke wurde das Bis(7-norbornenyl)-zinkNorbornenyl = Bicyclo-[2.2.1]-hepten(2)-yl. dargestellt und untersucht.
    Additional Material: 1 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 502 (1983), S. 158-164 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 5-Aza(oxa, thia)-2, 8-dithia-1-stanna(II)-bicyclo[3.3.01,5]octanes  -  Intramolecular Stabilized StannylenesBy the reaction of tin(II) butoxide with mercaptanes of the general type E(CH2—CH2SH)2 (E = N-t-Bu, NMe, O, S) at temperatures up to 50°C the 5-aza(oxa, thia)-2, 8-dithia-1-stanna(II)-bicyclo[3.3.01,5]octanes I - IV are obtained in high yields. The compounds are monomeric in solution. Contrary at higher reaction temperatures (80°C) the spiro-compounds of the type [E(CH2CH2S)2]2Sn (V - VIII) are formed. Some typical stannylene reactions of I - IV with BF3, Cr(CO)6, Br2, and PhS—SPh show the high reactivity of the compounds. Their structure is investigated by 1H, 13C, and 119Sn n.m.r., i.r., and Mössbauer spectroscopy.
    Notes: Durch Umsetzung von Zinn(II)-butoxid mit Mercaptanen des allgemeinen Typs E(CH2CH2SH)2 (E = N-t-Bu, NMe, O, S) werden bei Temperaturen bis 50°C die 5-Aza(Oxa, Thia)-2, 8-dithia-1-stanna(II)-bicyclo[3.3.01,5]octane in hohen Ausbeuten erhalten. Die Verbindungen sind monomer in Lösung. Bei höheren Reaktionstemperaturen (80°C) resultieren dagegen vorzugsweise die Spiroverbindungen des Typs [E(CH2CH2S)2]2Sn (V - VIII). Einige typische Stannylenreaktionen von I - IV mit BF3, Cr(CO)6, Br2 und PhS—SPh belegen die hohe Reaktivität der Verbindungen. Ihre Struktur wird durch 1H-, 13C-, 119Sn-NMR, IR- und Mößbauer-Spektren bewiesen.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 105-109 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Diolefin Complexes. II. Characterization of Phosphine-stabilized Iron Diolefin ComplexesBis(butadiene)triphenylphosphine iron and Bis(isoprene)triphenylphosphine iron are characterized by protolytic reactions, mass spectrometrical fragmentations and NMR-spectra. A structure for this compounds is proposed on the basis of the NMR spectra.
    Notes: Bis-(butadiene)triphenylphosphineisen und Bis-(isopren)-triphenylphosphineisen werden durch Protolysereaktionen, massenspektrometrische Fragmentierungen und NMR-Spektren charakterisiert. Auf der Grundlage der NMR-Spektren wird eine Struktur vorgeschlagen.
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,4,6-Trimethyl-5,5-dialkyldiptychdiazastannolidone - Intramolecular Pentacoordinated Stannyl Derivatives of N,N′,N″-Trimethyliminodiacetic Acid AmideThe title compounds were obtained by the reaction of dialkyltin dialkoxides with N,N′,N″-trimethyl iminodiacetic acid diamide in boiling toluene. The compounds are monomeric in benzene. Their structure was investigated by 1H, 13C and 119Sn n.m.r. measurements.
    Notes: Die Titelverbindungen werden durch die Reaktion von Dialkylzinndialkoxiden mit N,N′,N″-Trimethyliminodiessigsäurediamid in siedendem Toluen erhalten. Die Verbindungen sind monomer in Benzen. Ihre Struktur wird 1H-, 13C- und 119Sn-NMR-spektroskopisch aufgeklärt.
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