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  • Chemistry  (14)
  • 1985-1989  (8)
  • 1975-1979  (6)
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  • 1
    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.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 553 (1987), S. 136-146 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cis- and trans-1-Phosphabicyclo[4.4.0]decaneA mixture of cis-(5a) and trans-1-phosphabicyclo [4.4.0] decane 5b has been prepared by free-radical cyclization of (CH2 = CH—CH2—CH2)2CH—PH2 10. The isomers could be separated in a pure state. Stereostructures have been assigned by 13C n.m.r. at 153 - 302 K. Equilibration of 5a and 5b by u.v. irradiation gave ⊲G°35 ≍ 0 kJ ° mol-1 · Activation parameters for ring inversion of “cis” stereoisomer 5a and its “cis” P-sulfid 17a are found to be ΔG° = 41.9 kJ · mol-1 and 39.7 kJ · mol-1, respectively. Treatment of 5a and 5b with H2O2, sulfur, selenium, HSO3F, CH3I, CS2, and Ni(CO)4, respectively, yield the corresponding derivatives. 1H, 13C, 31P, 77Se n.m.r. and i.r. data are reported.
    Notes: Durch radikalische Cyclisierung von (CH2=CH—CH2—CH2)2CH—PH2 10 wird eine Mischung von cis- (5a) und trans-1-Phosphabicyclo[4.4.0]decan (5b) erhalten. Nach Trennung in die reinen Stereoisomeren konnten die Strukturen durch 13C-NMR-Spektren bei 153 - 302 K zugeordnet werden. Gleichgewichtseinstellungen 5a ⇌ 5b durch UV-Bestrahlung ergaben bei 35°C einen ⊲G°-Wert nahe Null. Die Aktivierungsparameter für die Ringinversion von 5a und seinem Sulfid 17a betragen ⊲G = 41,9 kJ · mol-1 bzw. 39,7 kJ · mol-1. Umsetzungen von 5a und 5b mit H2O2, Schwefel, Selen, HSO3F, CH3I, CS2 und Ni(CO)4 führten zu den entsprechenden Derivaten. Werte der 1H-, 13C-, 31P- und 77Se-NMR-Spektren sowie IR-Daten der LNi(CO)3 (L = 5a, 5b) werden mitgeteilt.
    Additional Material: 4 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 470-474 
    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 diastereomers of 16 1,3-oxa-, 1,3-aza- and 1,3- thiaphospholanes were assigned by means of the coupling constants 2J(P—C—H) and 3J(P—C—CH3) and the linewidths of the 31P signals and 1H chemical shifts of CH3 groups. It is shown that the change in the 31P chemical shifts allows the estimation of the relative configuration in these compounds.
    Notes: Die Diastereomeren von 16 1,3 Oxa-, 1,3-Aza-und 1,3-Thiophospholanen wurden mit Hilfe der Kopplungs-konstanten 2J(P—C—H) und 3J(P—C—CH3), der Signalbreite der 31P-Signale und der 1H-chemischen Verschiebungen der CH3-Gruppen zugeordnet. Es wird gezeigt, daß auch die 31P-chemischen Verschiebungen eine Bestimmung der relativen Konfiguration dieser Verbindungen gestatten.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 478-484 
    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 NMR chemical shifts of 18 methyl substituted cyclohexane-1,2-dicarboxylic anhydrides were determined. In compounds with asymmetric substitution vicinal coupling constants were measured. In the series of trans-anhydrides it can be deduced from the NMR data, that the 6-membered ring has a chair-like conformation. Additionally, in the series of the cis-anhydrides a twisted chair conformation is favoured for the most part.
    Notes: Die chemischen Verschiebungen der 1H-NMR-Spektren von 18 methylsubstituierten Cyclohexandicarbonsäure-(1,2)-anhydriden wurden bestimmt. Von den unsymmetrisch sub-stituierten Verbindungen wurden die vicinalen Kopplungskonstanten ermittelt. Bei den trans-Anhydriden lässtsich aus den NMR-Daten ableiten, dass der Sechsring in einer sesselähnlichen Form vorliegt. Auch bei den cis-Anhydriden sind in den meisten Fällen Konformationen mit verdrillter Sesselanordnung des Cyclohexans bevorzugt.
    Additional Material: 4 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1449-1450 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: BF3. OEt2-catalyzed reaction of cyclic thioureas (1) with 2-benzylidenecycloalkanones (2) afforded tricyclic 1,3-thiazines (3, 4). The progress of the reactions was found to depend on the ring size of both 1 and 2.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 1031-1037 
    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.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 450 (1979), S. 70-78 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR Investigations on Dimeric Dialkylthallium Compoounds with (TIX)2 Four-membered Ring StructureNMR investigations on dimeric dialkylthallium amides and on dimethylthallium diphenylphosphide indicate a significant influence of the largeness of the bridging groups on the binding strength in the (TIX)2-four-membered ring structure. Exchange reactions among different dimeric dialkylthallium compounds give evidence of a dimer-monomer equilibrium, which is of fundamental importance for the reactivity and the reaction mechanisms of these compounds.
    Notes: NMR-Untersuchungen an dimeren Dialkylthalliumamiden und am Dimethylthalliumdiphenylphosphid indizieren einen signifikanten Einfluß der Größe der Brückengruppen auf die Bindungsstärke in den (TIX)2-Vierringen. Austauschreaktionen zwischen unterschiedlichen dimeren Dialkylthalliumverbindungen beweisen ein Dimer-Monomer-Gleichgewicht, das von grundsätzlicher Bedeutung für die Reaktivität und die Reaktionsmechanismen dieser Verbindungen ist.
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 525 (1985), S. 35-40 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR-Studies of 1,2-Bis(alkylphosphino)benzenes and their Anions7Li, 13C, and 31P magnetic resonance spectroscopy, including studies of spin-lattice relaxation times, have been used to investigate the structure of 1,2-bis-(alkylphosphino)benzenes and their dilithiated species in THF and Et2O solutions. A phosphorus inversion barrier of 100-110 kJ/mol has been determined for the diastereomeric bisphosphines. The chemical shifts of the diphosphides demonstrate the delocalization of the negative charge of the anions in the aromatic ring. 7Li-31P-nuclear spin couplings and T1 measurements for 13C nuclei indicate that all lithiated species are dimers with intermolecular P-Li-P-bridges.
    Notes: 7Li-, 13C- und 31P-NMR, einschließlich Spin-Gitter-Relaxationszeitmessungen, wurden zur Strukturaufklärung von 1,2-Bis(alkylphosphino)benzenen und ihren dilithiierten Spezies in THF und Et2O-Lösungen angewendet. An den diastereomeren Bisphosphinen läßt sich eine Phosphorinversionsbarriere von 100-110 kJ/mol bestimmen. Die chemischen Verschiebungen der Diphosphide demonstrieren die Delokalisierung der negativen Ladung des Anions in den aromatischen Ring.7Li-31P-Kernspinkopplungen und T1-Messungen der 13C-Kerne zeigen, daß alle lithiierten Spezies unter Ausbildung intermolekularer P-Li-P-Brücken dimer vorliegen.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 544 (1987), S. 225-231 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N.M.R. Investigations of Fluorodiazadiphosphetidines and Fluoro-λ5-monophosphazenesThe 19F and 31P n.m.r. data of 37 fluorodiazadiphosphetidines [RR′PF—NC6H4X]2, and 62 fluoro-λ5-monophosphazenes, RR′PF=NC6H4X, are submitted. In the case of tetrafluorodiazadiphosphetidines, [RPF2—NC6H4X]2, an intramolecular exchange of the fluorine atoms at phosphorus has to be concluded from the n.m.r. data. The influence of the substituents R and X on the n.m.r. parameters is discussed using simple models of molecular structure.
    Notes: Es werden die 19F- und 31P-NMR-Daten von 37 Fluorodiazadiphosphetidinen, [RR′PF—NC6H4X]2, und 62 Fluoro-λ5-monophosphazenen, RR′PF=NC6H4X, mitgeteilt. Aus ihnen muß für die Tetrafluorodiazadiphosphetidine, [RPF2—NC6H4X]2, auf einen intramolekularen Positionswechsel der Fluoratome am Phosphor geschlossen werden. Der Einfluß der Substituenten R und X auf die NMR-Parameter wird anhand einfacher Modelle der Molekülstruktur diskutiert.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 440 (1978), S. 45-51 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Correlation of Tolman's Cone Angles with 1J(31p—1H) of Phosphonium FluorosulfonatesA 1H-n.m.r. study of three series of phosphonium salts [HPR3-nHn]X, and [HPPh2R1-nHn]X and (R = aliphatic substituent and H, X = SO3 F) gives a good relationship between increasing values of 1J(31P—1H) versus decreasing size of substituted phosphines. A method to obtain Tolman's cone angle is described.
    Notes: Die 1H-NMR-Untersuchung dreier Reihen von Phosphoniumsalzen [HPR3-nHn]X, [HPPhR2-nHn]X und [HPPh2R1-nHn]X (R = aliphat. Rest und H, X = SO3F) ergab einen inversen Zusammenhang von Werten der 1J(31p—1H)-Kopplungskonstante und Raumbedarf der Phosphine. Es wird eine Methode zur Bestimmung Tolmanscher Kegelwinkel auf der Basis von 1J(31p—1H)-Werten angegeben.
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