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  • Wiley-Blackwell  (1,061)
  • 1985-1989  (1,061)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Thermospray mass spectrometry of thiazides. A novel elimination and rearrangement resulting from a molecular adduct ion (1988)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 2 (1988), S. 25-27 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290020202
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  • 2
    Electronic Resource
    Electronic Resource
    Intra- and intermolecular hetero Diels-Alder Reactions. XIX. Stereoselective synthesis of five- and seven-membered annulated ring systems by intramolecular hetero Diels-Alder Reaction (1988)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 9-12 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Intra- und intermolekulare hetero-Diels-Alder-Reaktionen, XIX. - Stereoselektive Synthese von fünf- und siebengliedrigen anellierten Ringsystemen durch intramolekulare hetero-Diels-Alder-ReaktionDie intramolekulare hetero-Diels-Alder-Reaktion der Benzyliden-und (Pyrrolylmethylen)pyrazolone 8 und 12, die durch Knoevenagel-Kondensation von 7 mit den Aldehyden 6 und 11 erhalten werden, führt stereoselektiv mit hohen Ausbeuten zu den cis-anellierten Heterocyclen 13 und 15.
    Notes: The intramolecular hetero Diels-Alder reaction of the benzylidene- and (pyrrolylmethylene)pyrazolones 8 and 12, which have been obtained by Knoevenagel condensation of 7 with the aldehydes 6 and 11, respectively, proceeds stereoselectively to give the cis-fused heterocycles 13 and 15 in high yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198819880103
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  • 3
    Electronic Resource
    Electronic Resource
    Dihydroacepentalendiid, das Dianion des AcepentalensDiese Arbeit wurde von der Stiftung Volkswagenwerk und dem Fonds der Chemischen Industrie gefördert.Professor Edgar Heilbronner zum 65. Geburtstag gewidmet (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 98 (1986), S. 734-735 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19860980817
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  • 4
    Electronic Resource
    Electronic Resource
    Application of megabore capillary gas chromatography/mass spectrometry in the analysis of samples generated by the volatile organic sampling train (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1989), S. 138-144 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method of analyzing volatile organic sampling train (VOST) samples by megabore capillary gas chromatography/mass spectrometry has been developed to enhance compound resolution and to improve the characterization of products of incomplete combustion in stack emissions. Several analytical systems were evaluated. The combination of components which gave the best overall performance consisted of a clamshell oven used to desorb the Tenax® and/or Tenax®/charcoal VOST cartridges onto an analytical trap in a commercial purge and trap unit. The purge and trap unit thermally desorbed the contents of the analytical trap onto a megabore capillary column installed in a gas chromatograph where the VOST target compounds were characterized and quantified by a computerized mass spectrometer. All VOST target compounds showed response factors with coefficients of variation of less than 25% for triplicate analyses at four concentrations. The time of analysis using the capillary column was 30% faster than the present VOST protocol that requires packed-column gas chromatography.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200180209
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  • 5
    Electronic Resource
    Electronic Resource
    Polarized raman scattering from oriented single microcrystals of d(A5T5)2 and d(pTpT) (1988)
    New York : Wiley-Blackwell
    Biopolymers 27 (1988), S. 493-507 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polarized Raman spectra have been obtained from single microcrystals of the duplex of the decamer d(A5T5)2 using a Raman microscope. This is the first report of Raman spectra from a crystal of a deoxyoligomer that contains only long, nonalternating sequences of adenine and thymine. Sequences containing d(A)n and d(T)n are of interest in view of recent suggestions that they induce bends in DNA and that they might exist in a nonstandard B-conformation. Polarized Raman spectra of a crystal of d(pTpT) have also been obtained. Both crystals display Raman bands whose intensities are very sensitive to the orientation of the crystal with respect to the direction of polarization of the incident laser beam. These spectra indicate that the helical axes of the oligonucleotides are parallel to the long axes of the crystals and that the d(A5T5)2 is not appreciably bent in the crystal. The Raman spectrum from the d(pTpT) crystal indicates that all of the furanose ring puckers are in a C2′-endo configuration since only the C2′-endo marker band at 835 ± 5 cm-1 is present. Crystals of d(A5T5)2 show measurable Raman intensities in both the 838- and 816-cm-1 bands. This indicates the presence of both the C2′-endo and C3′-endo, or possibly other non-C2′-endo, furanose conformations. The 816-cm-1 band is weak so that only a small fraction of the residues are estimated to be in the non-C2′-endo conformation. In both the d(pTpT) and d(A5T5)2 crystals the intensity of the bands due to vibrations of the backbone show only a small dependence on orientation of the crystals. This result is explained by the low symmetry of the puckered sugar rings. It is concluded that Raman spectra obtained from oligonucleotide crystals in which the orientation of the crystal axes to the laser polarization is not carefully controlled may contain intensity artifacts that are due to polarization effects.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360270310
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  • 6
    Electronic Resource
    Electronic Resource
    Enolether, XVII. Die Acylierung von (Trimethylsilyl)enolethern mit Malonyldichlorid  -  Darstellung von 4-Hydroxy-2H-pyran-2-onen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 3394-3404 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enol Ethers, XVII. Acylation of Trimethylsilyl Enol Ethers with Malonyl Dichloride  -  Synthesis of 4-Hydroxy-2H-pyran-2-onesTrimethylsilyl enol ethers of aldehydes 1, acyclic and cyclic ketones 4 and 10, respectively, are acylated by malonyl dichloride (2) at room temperature or even at -60°C. After aqueous workup, the 6-unsubstituted 4-hydroxy-2H-pyran-2-ones 3 are obtained from 1-(trimethyl-siloxy)alkenes 1, whereas the 5,6-alkylene-bridged 4-hydroxy-2H-pyran-2-ones 11 are formed from 1-(trimethylsiloxy)cycloalkenes 10. Acylation of 2-(trimethylsiloxy)-1-propene (4a) and 3-(trimethylsiloxy)-2-pentene (4b) results in mixtures of 4-(trimethylsiloxy)-2H-pyran-2-ones 5 (main products) and phloroglucinol tris(trimethylsilyl) ethers 6 (by-products).
    Notes: (Trimethylsilyl)enolether von Aldehyden 1 und nichtcyclischen bzw. cyclischen Ketonen 4 bzw. 10 lassen sich mit Malonyldichlorid bei Raumtemperatur bzw. bereits bei -60°C acylieren. Hierbei entstehen nach wäßriger Aufarbeitung aus den 1-(Trimethylsiloxy)alkenen 1 die bislang nur schwer zugänglichen 6-unsubstituierten 4-Hydroxy-2H-pyran-2-one 3 und aus den 1-(Trimethylsiloxy)cycloalkenen 10 die 5,6-Alkylen-überbrückten 4-Hydroxy-2H-pyran-2-one 11. Die Acylierung von 2-(Trimethylsiloxy)-1-propen (4a) und 3-(Trimethyl-siloxy)-2-penten (4b) führt zu Gemischen aus 4-(Trimethylsiloxy)-2H-pyran-2-onen 5 (Hauptprodukte) und Phloroglucin-tris(trimethylsilylethern) 6 (Nebenprodukte).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861191116
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  • 7
    Electronic Resource
    Electronic Resource
    An experimental approach to the C8H10 hypersurface. Kinetic and thermochemical investigations on a formally forbidden ground-state [2σ + 2π] cycloaddition (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 177-186 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die C8H10-Kohlenwasserstoffe 1, 3, 4 und 6 wurden im statischen System thermolysiert, und die Arrhenius-Parameter wurden gemessen. Die Bildungswärmen wurden kalorimetrisch bestimmt. Aus diesen Daten läßt sich eine experimentelle Energiehyperfläche konstruieren, die folgende Merkmale aufweist: 1) Die Grundzustandsenergie von endo-1 ist um 8 kcal mol-1 höher als die von exo-4. 2) Der wichtigste Reaktionsweg ausgehend von endo-1 ist die formal verbotene [2σ + 2π]-Cycloaddition zu 3, deren Mechanismus diskutiert wird. 3) Obwohl die Aktivierungsenergien der Wege 4→6 und 4→3 gleich sind, verläft die Reaktion zu 6 aufgrund des größeren A-Faktors rascher. 4) Der Tetracyclus 3 thermolysiert gemäß dem Prinzip der mikroskopischen Reversibilität über exo-4 zu dem Dien 6.
    Notes: The C8H10 hydrocarbons 1, 3, 4, and 6 have been thermolyzed in a static system and the Arrhenius parameters have been obtained. Calorimetric measurements have been carried out to determine the heats of formation. From these data an experimental energy hypersurface is constructed which shows the following remarkable features: 1) The ground-state energy of endo-1 is higher than that of exo-4 by 8 kcal mol-1. 2) The predominant reaction pathway of endo-1 is the formally forbidden [2σ + 2π] cycloaddition to 3, the mechanism of which is discussed. 3) Although the activation energies of the routes 4→6 and 4→3 are the same, the reaction yielding 6 is faster due to a sizeably higher A factor. 4) The tetracycle 3 chooses the microscopic reverse pathway, i.e. its thermolysis proceeds via exo-4 to give the diene 6.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200209
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  • 8
    Electronic Resource
    Electronic Resource
    Inhibition by phorbol esters of antiimmunoglobulin induced calcium signalling and B-cell activation (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 129 (1986), S. 347-355 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The inhibitory effect of phorbol dibutyrate (PDB) on B-cell stimulation was evaluated using a model in which activation is induced by modest doses of antiimmunoglobulin antibody (anti-lg) and progression to DNA synthesis is induced by cytochalasin. PDB preferentially inhibited anti-lg-induced activation and did so during brief (2 hr) preincubation with anti-lg. Activation was inhibited whether PDB was added before or shortly after anti-lg. Since activation for cytochalasin responsiveness appears to be mediated by Ca2+, the effect of PDB on the anti-lg-induced rise in intracellular Ca2+ was evaluated. PDB (and other phorbol esters that activate protein kinase C) inhibited the rise in Ca2+ normally associated with anti-lg treatment; moreover, PDB reversed an established anti-lg-induced Ca2+ response. These data suggest that phorbol esters inhibit B-cell activation by interfering with the elevated levels of intracellular Ca2+ produced by cross-linking of surface immunoglobulin by anti-lg. This could represent a “feedback inhibition” type of response, but it remains to be seen if this occurs under physiological conditions of protein kinase C activation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041290313
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  • 9
    Electronic Resource
    Electronic Resource
    Cl2C—Cl⊙⊕, Cl2C—Cl—Br⊙⊕ and Br2C—Br—Cl⊙⊕ durch Gasphasendecarbonylierung von CX3COY⊙⊕Professor Rolf Huisgen zum 65. Geburtstag gewidmetDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie unterstützt. (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 97 (1985), S. 855-857 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19850971010
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  • 10
    Electronic Resource
    Electronic Resource
    Synthetische Peptide und ihre Anwendungsmöglichkeiten (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 97 (1985), S. 737-745 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zunehmend beschäftigen sich Peptidchemiker mit der Synthese biologisch und medizinisch wichtiger Polypeptide. In diesem Aufsatz werden einige nützliche Anwendungen von synthetischen Peptiden in Biochemie, Molekularbiologie, Immunologie und Medizin beschrieben. Synthetische Peptide sind von Interesse für Untersuchungen über Struktur-Funktions-Beziehungen bei Polypeptiden, als Peptidhormone und Hormonanaloga, für die Herstellung kreuzreagierender Antikörper und für die Konstruktion neuer Enzyme. Peptidchemiker können zum Fortschritt in den biologischen und medizinischen Wissenschaften beitragen, wenn sie mit deren aktuellen Problemen vertraut sind.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19850970905
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