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  • 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
    Zur Aminomethylierung der Heterocycloalkanone-(3) (1968)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 1052-1055 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Aminomethylierung der Heterocycloalkanone-(3) Thiophanon-(3), Tetrahydrothio-pyranon-(3) und Chromanon-(3) findet im sauren Medium bevorzugt in 4-Stellung und nicht an der dem Heteroatom benachbarten Methylengruppe statt. Die Struktur der Amin-Eliminierungsprodukte aus Mannich-Basen-Hydrochloriden von 2-Äthoxycarbonyl-tetra-hydrothiopyranon-(3) und 2-Äthoxycarbonyl-thiophanon-(3) weist ebenfalls auf eine Substitution in 4-Stellung hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19681010341
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Konfiguration der 1,3-Dichlor-2-methyl-1-propene (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 522-526 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Configuration of the 1,3-Dichloro-2-methyl-l-propenesDetermination of the configurations of 1,3-dichloro-2-methyl-1-propenes (1) was performed by 1H and 13C NMR spectroscopy using the isomer pairs of 1,3-dichloro-1-propenes (2), 1-chloro-2-methyl-1-propene-3-ols (3) and 1-chloro-1-propene-3-ols (4) as reference compounds. The chemical shifts, vicinal coupling constants, relative LIS value and NOE effects were in an unambiguous agreement with the (Z)-configuration of the lower-boiling isomer of 1.
    Notes: Die Konfigurationen von 1,3-Dichlor-2-methyl-1-propenen (1) werden mittels 1H- und 13C-NMR-Spektroskopie zugeordnet. Als Vergleichssubstanzen dienten die Isomeren von 1,3-Dichlor-1-propen (2), 1-Chlor-2-methyl-1-propen-3-ol (3) und 1-Chlor-1-propen-3-ol (4). Die chemischen Verschiebungen, vicinalen Kopplungskonstanten, relativen LIS-Werte und NOE-Effekte stehen mit der (Z)-Konfiguration des niedriger siedenden Isomeren von 1 eindeutig im Einklang.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160213
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  • 5
    Electronic Resource
    Electronic Resource
    Structural changes of LODP cellulose in the original and mercerized state during enzymatic hydrolysis (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 270-274 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die während der enzymatischen Hydrolyse unterschiedlicher Cellulosepräparate auftretenden Strukturveränderungen wurden mittels Röntgen-Kleinwinkel- und -Weitwinkelstreuung, Bestimmung des Wasserrückhaltevermögens und DP-Messung untersucht. Dazu wurden LODP-Proben im ursprünglichen (Cellulose I) und im mercerisierten (Cellulose II) Zustand mit einem kommerziellen Cellulosepräparat von Trichoderma reesei abgebaut. Die Mercerisierung des Cellulose I-Pulvers führt zu einem bemerkenswerten Anstieg der Abbaubarkeit infolge einer mehr feindispersen Hohlraumstruktur und damit einer deutlich höheren spezifischen inneren Oberfläche der Cellulose II-Probe. Basierend auf der Änderung von Kristallinitätsgrad, lateraler und longitudinaler Kristallitgröße und des DP nach unterschiedlich langer Hydrolyse wurde auf einen übermolekularen Abbaumechanismus nach dem Prinzip “Alles oder Nichts” für die Ketten der Cellulose I geschlossen, während für Cellulose II in den kristallinen Bereichen ein allmählicher Abbau von den Kettenenden her angenommen wird.
    Notes: The structural changes during enzymatic hydrolysis of cellulose substrates were studied by SAXS, WAXS, water retention values, and degree of polymerization. LODP cellulose samples in original (cellulose I) and mercerized (cellulose II) form were hydrolyzed using a commercial cellulase preparation produced by the fungus Trichoderma reesei. The mercerization of the LODP-cellulose I powder results in a remarkable increase in degradability due to a more finely dispersed void structure with a distinct higher specific inner surface of the cellulose II. Based on the course of the degree of crystallinity, lateral and longitudinal crystallite sizes, and the DP at different stages of degradation a supermolecular mechanism of the “all or nothing” type was found for the chains in LOPD-cellulose I, whereas for cellulose II an endwise degradation of ordered regions has been concluded.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430506
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  • 6
    Electronic Resource
    Electronic Resource
    Structures of Rare Earth Homodinuclear Macrocyclic Complexes with the Polyamine Polycarboxylic Ligand 1,4,7,10,14,17,20,23-Octaazacyclohexacosane-1,4,7,10,14,17,20,23-octaacetic Acid (H8OHEC) in the Crystal and in Solution (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1735-1743 
    Details
    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.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Konformationsanalyse und Diastereomerenzuordnung an 1,3-Aza- und 1,3-Oxaphospholanen mittels paramagnetischer Verschiebung (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 568-573 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The geometric factor G [G = (3 cos2 θ -1) r-3] of selected protons relative to a centre of co-ordination [Eu(dpm)3] is determined using Dreiding models of different conformers of 1,3-aza- and 1,3-oxaphospholanes. The centre of co-ordination is supposed to be joined to the oxygen of the carbonyl group or to the nitrogen and oxygen in the hetero-ring, respectively. The graphs of the geometric factors against the paramagnetic shifts of the relevant protons are straight lines only for the preferred conformers on the basis of a correct centre of co-ordination.As a measure for the paramagnetic shift of a proton the slope of the graph of chemical shift against the concentration of Eu(dpm)3 (in mol %) is chosen. By variation of the relative configuration at C-5 in the models and calculation of the geometric factor, it is possible to determine the different diastereomers, which are distinguished by the relative position of the substituent at phosphorus and C-5.
    Notes: An Dreiding-Modellen der verschiedenen Konformere von 1,3-Aza- und 1,3-Oxaphospholanen werden die Geometriefaktoren G [G = (cos2θ - 1)r-3] einzelner Protonen bezüglich eines Koordinationszentrums [Eu(dpm)3] bestimmt. Das Koordinationszentrum wird entweder an dem Sauerstoff der Carbonylgruppe oder an dem Stickstoff oder Sauerstoff im Heteroring gebunden angenommen. Die graphische Darstellung der Geometriefaktoren gegen die paramagnetischen Verschiebungen der betreffenden Protonen ergibt nur für die bevorzugten Konformere bei Zugrundelegung der richtigen Koordinationszentren Geraden. Als Maßzahl für die paramagnetische Verschiebung eines Protons wird die Steigung der Geraden gewählt, die sich beim graphischen Auftragen der chemischen Verschiebung gegen den Gehalt an Eu(dpm)3 (in Mol-%) ergibt. Durch Variation der relativen Konfiguration am C-Atom 5 an den Modellen und Berechnung der Geometriefaktoren ist es möglich, die unterschiedlichen Diastereomere zuzuordnen, die sich bezüglich der Substituentenstellung am Phosphor und am C-Atom 5 unterscheiden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270061103
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  • 8
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Phosphinalkylene - VII: NMR-Daten von Dimethylamino-methylen-phosphoranenFür VI. Mitteilung, siehe Lit.1. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 401-402 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1H and 31P—NMR parameters are reported for dimethyl-aminomethylene phosphoranes (1 to 4). The reaction of \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{\left\{ {\left({{\rm CH}_{\rm 3} } \right)_2 {\rm N}} \right\}_3 {\rm P - CH}_{\rm 2} {\rm - CH}_{\rm 3} } \right]{\rm Br} $\end{document}with NaNH2 gives 4.
    Notes: Es Werden die 1H- und 31P—NMR-Spektren der Dimethylamino methylen-phosphorane mitgeteilt und ein einfaches Herstellungsverfahren für 4 beschricben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050902
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Übergangsmetall-Diolefinkomplexe. IV. Synthese von Koordinationsverbindungen des Kobalts mit perdeuteriertem Butadien-1,3 (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 411 (1975), S. 143-147 
    Details
    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. IV. Synthesis of Cobalt Coordination Compounds of Butadiene-d6The synthesis and characterization of two cobalt complexes of butadiene-1, 3-d6 with the empirical formula CoC12D19 and CoC12D18H will be described. The results of the mass spectroscopy and the 1H-NMR studies lead to the proposed structure:.1(π-butadiene-1, 3-d6)(π-3-methyl-d3-heptadienyl-d10)cobalt.2(π-butadiene-1, 3-d6)(π-3-methyl-d2-heptadienyl-d10)cobalt. .The mechanism of synthesis of the named complexes will be reported.
    Notes: Die Darstellung und Charakterisierung von zwei Kobaltkomplexen des perdeuterierten Butadiens mit den Summenformeln CoC12D19 (1) bzw. CoC12D18H (2) wird beschrieben. Die Ergebnisse der Massenspektroskopie und der 1H-NMR-Studien führen zu folgenden Strukturvorschlägen:.1(π-Butadien-1, 3-d6)(π-3-methyl-d3-heptadienyl-d10)kobalt.2(π-Butadien-1, 3-d6)(π-3-methyl-d2-heptadienyl-d10)kobalt..Der Mechanismus zur Bildung der beiden π-Komplexe wird beschrieben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754110208
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  • 10
    Electronic Resource
    Electronic Resource
    5-Aza(Oxa, Thia)-2,8-dithia-1-stanna(II)-bicyclo[3.3.01,5]octane Intramolekular basenstabilisierte Stannylene (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 502 (1983), S. 158-164 
    Details
    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.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835020720
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