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  • Wiley-Blackwell  (67)
  • American Physical Society (APS)
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  • 11
    Electronic Resource
    Electronic Resource
    Zur Struktur eines neuen Nortriterpens aus den Bulbi von Scilla scilloides Druce1) (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 306-314 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of a New Nortriterpene from the Bulbs of Scilla scilloides Druce1)From the acetone extract of the bulbs of Scilla scilloides Druce (Liliaceae) the new nortriterpene 1 has been isolated. The structure of 1 was established on the basis of chemical and spectral evidences. Besides the free state 1 was obtained by mild acid hydrolysis of the acetone-insoluble and methanol-soluble fraction suggesting the existence of 1 also in the form of its glycosides.
    Notes: Aus dem Acetonextrakt der Bulbi von Scilla scilloides Druce (Liliaceae) wurde das neue Nortriterpen 1 isoliert. Auf Grund der chemischen und spektroskopischen Untersuchungen ließ sich die Struktur von 1 ermitteln. Neben dem frei enthaltenen 1 wurde offenbar glycosidisch gebundenes 1 bei der milden Säurehydrolyse der in Aceton unlöslichen und in Methanol löslichen Fraktion erhalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219820214
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  • 12
    Electronic Resource
    Electronic Resource
    Preparation and some reactions of bis(thioacyl) sulfides (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 1229-1244 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und einige Reaktionen von Bis(thioacyl)sulfidenDurch Umsetzung von Dithiocarbonsäuren mit Dicyclohexylcarbodiimid wurden die Bis-(thioacyl)sulfide 1, die nützliche und unter milden Reaktionsbedingungen einsetzbare Thioacylierungsmittel sind, dargestellt. Die aliphatischen Thioanhydride (1, R = Aliphaten) sind thermisch labile und feuchtigkeitsempfindliche purpurne öle, die bei Raumtemperatur zu den Dithietanen 5 dimerisieren, während die meisten aromatischen Derivate (1, R = Aromaten) tiefgrüne, einigermaßen stabile Kristalle bilden. Einige Reaktionen mit Nucleophilen werden diskutiert.
    Notes: Reaction of dithioic acids with dicyclohexylcarbodiimide has been found to give the corresponding bis(thioacyl) sulfides 1 in good yield, which are very useful thioacylating reagents under mild reaction conditions. Most of the aromatic thioanhydrides (1, R = aromatic) are fairly stable green crystals at room temperature, but the aliphatic ones (1, R = aliphatic) are unstable purple oils which dimerize at room temperature to give the dithietanes 5. The reactions with nucleophiles are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219820702
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  • 13
    Electronic Resource
    Electronic Resource
    The Preparation and Some Reactions of Unsymmetrical Acyl Thioacyl Sulfides (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1798-1811 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und einige Reaktionen von unsymmetrischen Acyl(thioacyl)sulfidenDurch Umsetzung von Piperidinium- oder Natrium-dithiocarboxylaten mit Acylchloriden oder durch Entschwefelung von Acyl(thioacyl)disulfiden mit Triphenylphosphan wurden einige un-symmetrische Acyl(thioacyl)sulfide [RC(S)S(O)CR'] dargestellt und charakterisiert. Die tiefblauen Öle oder hellgrünen Kristalle sind thermisch labil und feuchtigkeitsempfindlich. Die n →π-Übergänge der Thiocarbonylgruppe in 1 treten bei höheren Wellenlängen auf als die der entsprechenden symmetrischen Bis(thioacyl)sulfide [RC(S)S(S)CR']. Einige Reaktionen mit Nucleophilen werden diskutiert. Die Umwandlung von unsymmetrischen Acyl(thioacyl)sulfiden in symmetrische Bis(thioacyl)disulfide erfolgt in Gegenwart von Basen wie Lithium-ethanthiolat mit guten Ausbeuten.
    Notes: A number of unsymmetrical acyl thioacyl sulfides [RC(S)S(O)CR'] have been prepared and characterized by the reaction of piperidinium or sodium dithiocarboxylates with acyl chlorides or by desulfurization reaction of acyl thioacyl disulfides with triphenylphosphine. They are deep blue oils or light green crystals and very unstable thermally and for moisture. The n →π transitions of the thiocarbonyl group of 1 appear in higher wave length region than those of the corresponding symmetrical bis(thioacyl) sulfides [RC(S)S(S)CR']. Some reactions with nucleophiles are discussed. It was found that the symmetricallization reaction of these unsymmetrical acyl thioacyl sulfides occurs in the presence of base such as lithium ethanethiolate to give the symmetrical bis(thioacyl) disulfides in fair yield.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119811008
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  • 14
    Electronic Resource
    Electronic Resource
    Alternating copolymerizations of styrene and acrylic monomers initiated with carbanions in the presence of ZnCl2 (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 721-727 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On electrochemical initiation of alternating copolymerizations of styrene-acrylonitrile (AN) and styrene-diethyl fumarate (DEF) in the presence of ZnCl2, radical anions of AN-ZnCl2 and DEF-ZnCl2 complexes produced at the cathode were assumed to initiate copolymerization. In analogy with the cathode-initiated copolymerization, the radical anions of AN-ZnCl2 and DEF-ZnCl2, generated with the carbanions such as sodium naphthalene, disodium α-methylstyrene tetramer dianion, and butyllithium, were also found to produce alternating copolymers of styrene-AN and styrene-DEF. On the contrary, no polymers were obtained from methyl methacrylate (MMA)-styrene and methacrylonitrile (MAN)-styrene in the presence of ZnCl2 either with carbanions or by electrochemical reduction. Styrene-MAN-ZnCl2 yielded an alternating copolymer with carbanions upon introduction of oxygen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160401
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  • 15
    Electronic Resource
    Electronic Resource
    Viscoelastic properties of polyelectrolyte solutions in non-entangled concentrated regions (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 40 (1996), S. 269-273 
    Details
    ISSN: 0959-8103
    Keywords: viscoelastic properties ; polyelectrolyte ; sodium polystyrenesulfonate ; non-entangled region ; Rouse model ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Viscoelastic properties of non-entangled concentrated aqueous solutions of three sodium polystyrenesulfonates with low molecular weights were measured in oscillation flows. Master curves of dynamic moduli were obtained by shifting the moduli data measured at different concentrations along the frequency (ω) axis for each molecular weight. The concentration shift factor used in making the master curves composes a single line irrespective of molecular weight. Storage and loss moduli are proportional to ω2 and ω, respectively, in the terminal region, while they are proportional to ω1/2 in the transition region. All the master curves can be well represented by the modified Rouse theory using the experimental values of concentration, molecular weight and viscosity in a reference state.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Polyelectrolyte complexes of heparin with chitosan (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 2561-2563 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200924
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  • 17
    Electronic Resource
    Electronic Resource
    13C NMR spectra of tricyclo[4.2.1.02,5]nonanes and tetracyclo[5.4.1.02,6.08,11]dodecanes (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 416-418 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR spectra of tricyclo[4.2.1.02,5]nonanes and tetracyclo[5.4.1.02,6.08,11]dodecanes and their dimethyl derivatives were measured to demonstrate the four-membered ring annelation effects on the bicyclo[2.2.1]heptane skeleton, and the steric δ-syn effects of the methyl groups attached to the four-membered ring on the bridge carbons in these systems.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220703
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  • 18
    Electronic Resource
    Electronic Resource
    Poly-N-methacrylyl cysteine (1964)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 73 (1964), S. 215-224 
    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: Die Synthese und die Eigenschaften von Poly-N-methacrylylcystein wurden untersucht. Poly-N-methacrylylcystein wurde aus S-Thiophenyl-N-methacrylylcystein, S-Benzyl-N-methacrylylcystein oder N,N′-Bis-methacrylylcystin durch Polymerisation in Gegenwart eines Radikalkatalysators und nachfolgende Reduktion der betreffenden Polymeren dargestellt. Auch Copolymere aus N-Methacrylylcystein und Vinylverbindungen wurden synthetisiert. Diese Polymeren gaben durch die Oxydation mit Jod Polymere mit Disulfidvernetzung und reagierten mit Halogenverbindungen oder einigen Disulfidverbindungen; sie reagierten wie niedermolekulare Merkaptane auch mit Metallionen und Carbonylverbindungen.
    Notes: The synthesis and the properties of poly-N-methacrylyl cysteine have been studied. Poly-N-methacrylyl cysteine was prepared from S-thiophenyl-N-methacrylyl cysteine, S-benzyl-N-methacrylyl cysteine or N,N′-bisymethacrylyl cystine, by polymerizing them in the presence of a radical catalyst and reducing the respective polymers formed. Copolymers of N-methacrylyl cysteine and vinyl compounds were also synthesized. These polymers were converted by the oxidation with iodine to polymers with disulfide crosslinking and reacted with halogen compounds or some disulfide compounds. They reacted, like low molecular mercaptans, also with metallic ions and carbonyl compounds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1964.020730118
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  • 19
    Electronic Resource
    Electronic Resource
    High-sensitivity measurement of metastable ion abundancesSee Ref. 1. (1969)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1969), S. 751-753 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurement of metastable ion abundances over a dynamic range of 105 is possible with a specially designed mass spectrometer.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210020709
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  • 20
    Electronic Resource
    Electronic Resource
    Electron spin resonance studies of plasma-induced polystyrene radicals (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 29 (1991), S. 1-7 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Plasma-induced polystyrene radicals were first studied by electron spin resonance (ESR). The room temperature ESR spectrum was compared with those obtained by γ-irradiation, UV-irradiation, and mechanical fracture. It was found that even less than a few seconds of plasma-irradiation gave rise to a large amount of polystyrene radicals and the ESR spectrum consisted of two types of spectra, a triplet and a single broad line. The spectral feature of the triplet was nearly identical with that of γ-irradiated polystyrene. Thus, it was assigned to the structure of a cyclohexadienyl-type radical formed by a nearly random addition of a hydrogen atom to the aromatic ring. The single broad line, thought to be an outline of multicomponent spectrum, was assigned to an immobilized dangling-bond sites at the plasma-induced crosslinked portion of the polystyrene surface.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1991.080290102
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