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  • Articles  (12)
  • Chemistry  (12)
  • Wiley-Blackwell  (12)
  • American Physical Society
  • Springer
  • 2005-2009
  • 1985-1989  (10)
  • 1970-1974  (2)
  • 1920-1924
  • 1905-1909
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of an N-Acetylated Heparin Pentasaccharide and its anticoagulant activity in comparison with the heparin pentasaccharide with high anti-factor-Xa activity (1989)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 72 (1989), S. 1268-1277 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of tri-N-acetylated heparin pentasaccharide 2 is described. It was assembled from five suitably blocked monosaccharide units (3-7). Glucuronic-acid building block 4 was prepared from glucose by direct Jones oxidation of the 6-O-trityl derivative 18. The resulting acid 16 was esterified to 17 in large mounts using methyl chloroformate/base. Trimethylsilyl bromide proved to be an excellent reagent for the hydrolysis of a prop-1-enyl glycoside (19 →21). The pentasaccharide 29 was obtained by a [2 + 2] + 1 synthesis, the glycosylation reactions furnished good to very good yields. The identity of protected oligosaccharides was confirmed by 1H-NMR spectroscopy. Sequential deblocking of the pentasaccharide, O-sulfation, and N-acetylation gave 2 which was shown to exhibit ca. 600 times lower anticoagulant activity than pentasaccharide 1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19890720613
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  • 2
    Electronic Resource
    Electronic Resource
    Heterogeneous nucleation and growth of spherulites from a polycaprolactone (poly(1-oxy-6-oxohexamethylene)) melt (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 2483-2488 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird über den Beginn einer Untersuchung zur Kristallisationskinetik von Polycaprolacton (Poly(1-oxy-6-oxohexamethylene) (1)) berichtet. Die primäre Keimbildung und das primäre Sphärolith-Wachstum aus der Polymerschmelze werden bei hinreichend hohen Temperaturen verfolgt, wodurch sichergestellt ist, daß das Wachstum der Kristallite durch Keimbildung bestimmt ist. Die kinetischen Daten werden weitgehend mit Hilfe des Avrami-Modells interpretiert, welches sich gut auf die Kristallisation von 1 anwenden ließ.
    Notes: A kinetic crystallization study of polycaprolactone (poly(1-oxy-6-oxohexamethylene) (1)) has been initiated to investigate the primary nucleation and primary spherulitic growth from a polymer melt at temperatures that are high enough to insure nucleation-limited crystallite growth. The analysis of the kinetic data is largely made on the basis of an Avrami model which proved to be well suited for the interpretation of the crystallization of 1.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750821
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic analysis of a microbial process: A systems engineering approach (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 15 (1973), S. 377-393 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A general mathematical model of the chemostat system is developed in order to define an experimental program of dynamic testing. A glucose-limited culture ofSaccharomyces cerevisiae was grown in a chemostat using chemically defined medium. The chemostat was perturbed from an initial steady state by changes in input glucose concentration, dilution rate, pH, and temperature. Dynamic responses of cell mass, glucose, cell number, RNA, and protein concentrations were measured. A number of simulation techniques were used in developing a dynamic mathematical model and in comparing the developed model with experimental data as well as the Monod model. The resulting model was found to be quantitatively accurate and superior to the Monod model. The developed model was interpreted in the light of cell physiology. Adjustment of intracellular RNA fraction was found to be rate limiting in acceleration of cell specific growth rate.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260150212
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  • 4
    Electronic Resource
    Electronic Resource
    Simultaneous assay of serum vitamin A and vitamin E by high performance liquid chromatography using time-switched UV and fluorimetric detectors (1986)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 281-284 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Time-switched detectors ; UV detection ; Fluorimetric detection ; Vitamin A ; Vitamin E ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An HPLC method utilizing a UV and a fluorimetric detector linked in series is described. By use of a simple integrator-controlled time-switched relay, analysis of serum vitamin A and E is accomplished on the same chromatogram and at optimum sensitivity for each detector. A single internal standard (retinyl acetate) monitored only by the UV detector permits measurement of both vitamins over a wide linear range. Precision of the assays is satisfactory, both on a within-day and on a day-to-day basis. Recoveries of both vitamins are virtually 100% whilst sensitivity is 2 μg/L (retinol) and 0.05 mg/L (α-tocopherol).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240090506
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  • 5
    Electronic Resource
    Electronic Resource
    Übergangsmetallpolysulfide, Koordinationsverbindungen mit rein anorganischen Chelatliganden (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 97 (1985), S. 745-760 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es ist schon sehr lange bekannt, daß sich manche Übergangsmetallsulfide in wäßrigem Ammoniumpolysulfid lösen. Obwohl anzunehmen war, daß sich dabei Metallpolysulfide bilden, hat man sich diesem Verbindungstyp erst in den letzten Jahren intensiver zugewandt. Dabei konnte eine Fülle neuer Komplexe mit Polysulfido-Chelatliganden Sn2- (n=2,3,4…) isoliert und charakterisiert werden. Die Komplexe interessieren bezüglich ihrer Struktur und Reaktivität, aber auch im Hinblick auf mögliche Anwendungen; mit ihnen können Schwefelringe definierter Größe gezielt hergestellt werden, und es deutet sich an, daß sie auch in der Katalyse Verwendung finden könnten.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19850970906
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen an Systemen aus Salzen und gemischten Lösungsmitteln. XXXIV. 27Al- und 1H-NMR-spektroskopische Untersuchungen an Lösungen des Systems AlCl3-Wasser-N,N-Dimethyl- formamid (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 558 (1988), S. 231-239 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Systems of Salts and Mixed Solvents. XXXIV. 27Al and 1H N.M.R. Spectroscopic Investigations of AlCl3-Water-N,N-Dimethylformamide SolutionsAl3+ ions exist in aqueous solutions as well as in DMF solutions in a sixfold coordination; the coordination of DMF exclusively occurs via the oxygen atom. Because of the small shift difference between the pure aqueous and the pure DMF solution at the 27Al n.m.r. spectra no separated signals were found corresponding to the species with mixed coordination. From the changes of the Al chemical shifts and of the linewidths in dependence of the solvent composition a selective solvation process is suggested. At the 1H n.m.r. spectra for the formyl and methyl protons of DMF separated signals appear for the molecules of the first coordination sphere and of the bulk, respectively. From this the number of directly coordinated DMF molecules can be determined. Up to a DMF content of about x = 0.45 DMF is preferentially coordinated, after that a change of selectivity takes place and accordingly water is preferred at the first coordination sphere.
    Notes: Al3+-Ionen werden sowohl in wäßrigen als auch in DMF-Lösungen sechsfach koordiniert, die Koordination des DMF erfolgt über Sauerstoff. Wegen der geringen Verschiebungsdifferenz zwischen der reinen wäßrigen und der reinen DMF-Lösung treten in den 27Al-NMR-Spektren mit gemischtem Lösungsmittel keine getrennten Signale für gemischt-koordinierte Spezies auf. Aus den Änderungen der Al-chemischen Verschiebung und der Halbwertsbreite der Signale in Abhängigkeit von der Lösungsmittelzusammensetzung werden Hinweise auf eine selektive Solvatation erhalten. In den 1H-NMR-Spektren erscheinen für die Formyl- und Methylprotonen des DMF getrennte Signale für die Moleküle in der ersten Koordinationssphäre und die des restlichen Lösungsmittels. Daraus läßt sich die Anzahl der direkt koordinierten DMF-Moleküle ermitteln. Bis zu einem DMF-Gehalt von x s≈ 0,45 wird bevorzugt DMF koordiniert, danach tritt ein Selektivitätswechsel auf, so daß bevorzugt Wasser koordiniert wird.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885580124
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  • 7
    Electronic Resource
    Electronic Resource
    NMR-spektroskopische Untersuchungen an Fluoro-diaza-diphosphetidinen und Fluoro-λ5-monophosphazenen (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 544 (1987), S. 225-231 
    Details
    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.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875440124
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen an Systemen aus Salzen und gemischten Lösungsmitteln. XXXVI. 1H- und 27AI-NMR-Untersuchungen des Solvatationsverhaltens in konzentrierten Lösungen des Systems AICI3-Wasser-Alkohol (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 169-179 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Systems of Salts and Mixed Solvents. XXXVI. 1H and 27Al N.M.R. Spectroscopic Investigations of the Solvation Behaviour in Concentrated AlCl3-Water-Alcohol Solutions1H. n.m.r. spectroscopic investigations in dependence on the solvent composition and the salt concentration are useful for the characterization of solvation processes in concentrated solutions of AlCl3-water-methanol, -ethanol, -ethylene glycol, and -diethylene glycol. In these systems water is preferentially coordinated at the first coordination sphere of the Al3+ ion within the whole region of the solvent composition.The nature of the solvation species has been investigated using 27Al n.m.r. spectroscopy. In order to reduce the „solid-type“ interactions in the concentrated solutions the Magic Angle Spinning method (MAS) was used. Particularly water-poor and water-free solutions produce structured 27Al-Mas-signals. For the system AlCl3-water-ethanol an identification of solvation species is given.
    Notes: Durch 1H-NMR-Untersuchungen in Abhängigkeit von der Lösungsmittel-zusammensetzung und der Salzkonzentration werden Solvatationsprozesse in konzentrierten Lösungen von AlCl3-Wasser-Methanol, -Ethanol, -Ethylenglycol und -Diethylenglycol näher charakterisiert. Es wird jeweils eine bevorzugte Solvatation des Al3+-Ions durch Wasser über den gesamten Zusammensetzungsbereich der Lösungsmittel festgestellt.27Al-NMR-Untersuchungen dienen zur Identifizierung von Solvatationsspezies. Zur Reduzierung der festkörperähnlichen Wechselwirkungen in den konzentrierten Elektrolytlösungen wurde die Methode der schnellen Probenrotation um den „magischen“ Winkel (MAS) eingesetzt. Insbesondere wasserarme und wasserfreie Lösungen der Systeme zeigen strukturierte 27Al-MAS-Signale. Im System AlCl3-Wasser-Ethanol wird eine Identifizierung von Solvatationsspezies vorgenommen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885660122
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on systems of salts and mixed solvents 35For Part 34, see Ref. 3. - 27 Al NMR investigations of AlCl3-water-N,N-dimethylformamide solutions using the solid-state MAS technique (1989)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 307-310 
    Details
    ISSN: 0749-1581
    Keywords: 27Al NMR spectroscopy ; MAS technique ; Concentrated electrolyte solutions ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conventional liquid-state 27Al NMR spectra of concentrated solutions of the AlCl3-water-N,N-dimethyl-N-Dimethylformamide formamide system contain comparatively broad non-structured lines. Application of MAS leads to a reduction in the line width and a structuring of the spectra. This allowed the experimental determination of the chemical shifts of [Al(H2O)6-x(DMF)x]3+ (x = 0-6) mixed-ligand complexes. The investigations demonstrate an example of the applicability to liquids of the NMR MAS technique, which was originally developed for solids. They underline the existence, in a reduced form, of ‘solid-type’ interactions within the investigated solutions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260270402
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  • 10
    Electronic Resource
    Electronic Resource
    Transition Metal Polysulfides: Coordination Compounds with Purely Inorganic Chelate Ligands (1985)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 24 (1985), S. 742-757 
    Details
    ISSN: 0570-0833
    Keywords: Polysulfides ; Transition metals ; Chelates ; Sulfides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It has been long known that certain transition metal sulfides dissolve in aqueous ammonium polysulfide. Although it was assumed that they thereby formed metal polysulfides, attention was first paid to such compounds only a few years ago. In recent years a host of new complexes with polysulfido chelate ligands have been isolated and characterized. The complexes are of interest not only regarding their structure and reactivity but also in view of their potential uses; they can be used for the directed preparation of sulfur rings of a given size, and there are indications that they will find applications in catalysis.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198507421
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