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  • Chemistry  (54)
  • 1995-1999  (19)
  • 1980-1984  (23)
  • 1960-1964  (10)
  • 1950-1954  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Darstellung einiger 8-Alkyl- und 8-Alkenyl-theophylline (1960)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 93 (1960), S. 99-102 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 8-Alkyl- und 8-Alkenyl-theophylline werden aus 1.3-Dimethyl-4.5-diaminouracil und gesättigten Carbonsäuren bzw. β.γ- und γ.δ-ungesättigten Carbonsäuren durch Kondensation nach TRAUBE dargestellt; α.β-ungesättigte Säuren reagieren nicht.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19600930117
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  • 2
    Digitale Medien
    Digitale Medien
    Syntheses, Structures, and Equilibria of o-, m-, p-Tolyl- and Phenylantimony RingsDedicated to Prof. Dr. H. Schumann on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 599-603 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Cyclopentastibanes ; Cyclohexastibanes ; Antimony compounds ; Phenylantimony rings ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Exchange reactions of R3Sb (R = o-Tol, m-Tol, p-Tol) with SbCl3 in a 1:2 molar ratio give RSbCl2. Silylstibanes RSb(SiMe3)2 were obtained by reaction of RSbCl2 and Me3SiCl with Mg in THF. Slow access of air to solutions of RSb(SiMe3)2 afforded orange crystals of the composition (RSb)n. Crystal structures were determined by X-ray crystallography for R = o-Tol and m-Tol as stacks of (RSb)6 rings in the chair conformation with equatorial substituents. In the crystals of (m-TolSb)6 there are short intermolecular Sb≡b distances of 420 pm. Solutions of (RSb)n (R = Ph, o-Tol, m-Tol, p-Tol) in C6D6 were analyzed by 1H-NMR spectroscopy. They contain (RSb)5 and (RSb)4 in equilibria. Raman spectra of (PhSb)6 or (p-TolSb)n show signals for Sbn at β = 151 or 153 cm-1. 13C-CP-MAS-NMR data of (p-TolSb)n are reported.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19951280612
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  • 3
    Digitale Medien
    Digitale Medien
    Organoantimony Oxides: Preparation and Crystal Structures of [(2-PhOC6H4)O (C6H4)2Sb]2O2 and (o-Tol2Sb)4O6Dedicated to Prof. Dr. Gottfried Huttner on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 959-961 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Air oxidation of (Oxydi-2,1-phenylene)(2-phenoxyphenyl)stibane (1) gives the phenoxystibane oxide [(2-PhOC6H4)O(C6H4)2Sb]2O2 (2). Single crystals of (o-Tol2Sb)4- O4(O2)2 (3) were obtained by air oxidation of o-TolSb-(SiMe3)2. Crystal structures of 2 and 3 are reported.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19971300724
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  • 4
    Digitale Medien
    Digitale Medien
    Zur Kondensation von Carbonylverbindungen mit Hydrazinen, X. Über die Autoxydation kernsubstituierter Phenylhydrazine (1964)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 97 (1964), S. 2335-2341 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Hauptprodukte der Reaktion von Phenylhydrazin und seinen Kernsubstitutionsprodukten mit molekularem Sauerstoff sind entsprechend substituierte Benzole, Stickstoff und Wasserstoffperoxid. Durch Ermittlung der Anfangsgeschwindigkeiten bei konstanter Sauerstoffkonzentration aus den jodometrisch bestimmten zeitlichen Konzentrationsabnahmen der Hydrazine während der Autoxydation gelingt es, die Hauptreaktion zu erfassen und nach einem Zeitgesetz 1. Ordnung zu behandeln. Der unterschiedliche Einfluß der Kernsubstituenten auf diese Reaktion folgt der HAMMETT-Beziehung.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19640970832
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  • 5
    Digitale Medien
    Digitale Medien
    Modellrechnungen zu Explosionen freier Gaswolken von Kohlenwasserstoff/Luft-GemischenVortrag von F. Ebert auf der GVC-Tagung „Sicherheit in der Chemischen Technik“, 25./26. Febr. 1982 in Düsseldorf. (1982)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 54 (1982), S. 736-741 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Model calculations on the explosion of free gas clouds containing mixtures of hydrocarbons and air. The procedure presented permits a description of continuously and discontinuously accelerated explosions. The explosions considered are deflagrations, i. e. combustion-supported compression waves. It is possible to calculate, for a given rate of propagation of a flame front or the motion of a piston assigned in a model, the corresponding flow field (compression wave). The corresponding pressure, density, and velocity distributions can be utilized for safety considerations. Application of the results requires that the simulated acceleration processes can be transformed into real events. With the experimental results presently available this is possible only in very crude fashion and can serve only as a rough preliminary guide.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330540808
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  • 6
    Digitale Medien
    Digitale Medien
    Zur Bewegung feiner Partikeln, die in turbulent strömenden Medien suspendiert sind (1983)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 55 (1983), S. 931-939 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Motion of fine grained particles, suspended in turbulent flow. This article considers the motion of particles, suspended in turbulent flow. If the particles are sufficiently small to respond to turbulence, their motion includes stochastic components. Concerning processes like air classification or separation of fine powders the stochastic contribution - characterized by the conception of a particle diffusivity - the particle motion exhibits a detrimental influence. Sharpness of cut and separation efficiency are reduced. The paper aims to present the state of the art in particle diffusion. First, theoretical investigations are reported, attention being focused on the equation of motion of the particle which is the link between the motion of the fluid and the motion of the particle. Then, experimental results are reviewed. The following tendencies can be seen: Particles which response to turbulence of fluid flow show increasing diffusivity with increasing inertia. Field forces like gravity or electrical field forces exhibit a damping effect on diffusivity.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330551206
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  • 7
    Digitale Medien
    Digitale Medien
    Polymer-solvent interactions: Dextrans in water and DMSO (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1071-1080 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Enthalpies of solution, dilution and mixing of several dextran fractions with different molecular weights (MW) and low MW carbohydrates were determined in water and dimethyl sulfoxide at 25°C. The enthalpies of solution of dextran increase in the oligomer range up to a MW of about 1000; for higher MWs the enthalpies of solution are almost constant. The enthalpies of dilution decrease strongly with increasing MW and remain constant for MWs higher than 2 000. The interaction parameter was found to depend on the concentration of the solute in both solvents. From the experimental results it can be concluded that dimethyl sulfoxide is a better solvent for glucose and dextran than water. In dilute solutions glucose interacts considerably more strongly with the solvent than dextran. The conformational properties of dextran are similar in both solvents; for MWs above 2 000 the degree of solvation is found to be independent from the MW.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1980.021810511
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  • 8
    Digitale Medien
    Digitale Medien
    On the kinetics and mechanism of thermal degradation of polystyrene, 2.Part 1: cf.1. Formation of volatile compounds (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 991-1001 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Thermal degradation of polystyrene (PS) was carried out in the absence of oxygen between 292 and 336°C. The formed volatile products were analysed qualitatively and quantitatively by means of gas charomatography. It was found that the composition of the volatile fraction is a function of conversion and independent of temperature for most of the products. A radical chain mechanism is proposed to explain these experimental results.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1984.021850513
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  • 9
    Digitale Medien
    Digitale Medien
    Elastic and quasielastic light scattering studies on the branching characteristics of dextrans (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 2205-2212 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The influence of branching on the radius of gyration and the hydrodynamic radius of dextran macromolecules was studied by elastic and quasielastic light scattering (ELS and QELS). The hydrodynamic radius is more sensitive to low levels of branching than the radius of gyration. At higher branching levels a saturation of the hydrodynamic radius rh is observed, while the radius of gyration rG still changes distinctly. The ratio rG/rh proves to be a measure of the flexibility of the macromolecules; the latter is increasing with molecular weight for short linear chains and is decreasing with increasing degree of branching. Measurements were carried out in water (thermodynamically good solvent) and in ethylene glycol (under theta conditions) on four series of dextran fractions having rather narrow molecular weight distributions.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1984.021851015
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  • 10
    Digitale Medien
    Digitale Medien
    On the kinetics and mechanism of thermal degradation of polystyrene (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1207-1218 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The thermal degradation of polydisperse polystyrene samples with mol. wts. (M̄n) between 60000 and 22000 has been investigated at different temperatures under oxygen free conditions. Product analysis has been carried out by GPC. The experimental degradation could be simulated by a model consisting of scission and depolymerization. The dynamical behaviour of this model is expressed in a matrix from. The ratio of scission and depolymerization is constant for all polymers and different temperatures during degradation. Therefore, a master curve could be evaluated, which gives a general relation between the decrease of mol. wt. and the mass of volatiles. Finally a radical chain mechanism has been proposed in a lumped form which is consistent with the kinetic model and the experimental results.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1982.021830514
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