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  • Chemistry  (78)
  • 2020-2020
  • 2015-2019  (4)
  • 1985-1989  (70)
  • 1970-1974  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Reduktive Arylierung von Vinyl-trifluoromethansulfonaten durch Friedel-Crafts-Reaktion (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1255-1256 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Reductive Arylation of Vinyl Trifluromethanesulfonates by Friedel-Crafts ReactionThe reaction of vinyl triflates 1 with benzene and toluene in the presence of aluminium trichloride gives alkyl-, alkenyl-, and 1,1-diarylalkanes 5, 6, 3, 9 depending on the structure of the substrate used. A mechanism for the reductive arylation is proposed.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19871200724
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  • 2
    Digitale Medien
    Digitale Medien
    Acetylene-norbornene copolymers (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3937-3949 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Metathesis ring opening polymerization has been used to copolymerize norbornene and 7,8-bis(trifluoromethyl)tricyclo[4,2,2,02,5]deca-3,7,9-triene. Subsequent thermal elimination of the precursor copolymers yielded acetylene-norbornene copolymers. The undoped copolymers were found to have electrical conductivity, spin concentration, and EPR linewidths which vary with composition. The location of the trans-C—H out-of-plane vibration, however, was invariant at 1010cm-1 indicating that conjugation length of n 〉 4 are present even at 40% acetylene content in the copolymer. The copolymers containing 79 mol % of acetylene units attained a doped conductivity of 0.02 S/cm with a dopant concentration of 6 mol % of I3- per sp2 carbon.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1989.080271206
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  • 3
    Digitale Medien
    Digitale Medien
    Configurational stereoselectivity in the nucleophilic substitution of poly(vinyl chloride) with sodium thiophenate: NMR study and Monte-Carlo simulation of the reaction (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 1753-1777 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The nucleophilic substitution of the chlorine atoms of poly(vinyl chloride) with sodium thiophenate is assumed to obey an SN2 mechanism with inversion of configuration and a steric control according to which reactivities R of the triads follow the order Rmm 〉 Rmr ≫ Rrr. Such a reaction cannot be described by simple differential equations, but a Monte Carlo simulation, first generating a random Bernouillian chain and then simulating random attack of the chain by the reactant according to the triad reactivities, allows a good agreement with the experimental results of both the kinetics of a reaction carried out in cyclohexanone solution at 40°C and the evolution of the 13C and 1H NMR spectra of the tertiary carbon atoms, assuming the following parameters: Bernouillian probability for a meso placement in the initial chain: 0.431; relative reactivities of the mm, mr and rm, rr triads: 1, 0.5, and 0., respectively. The agreement is excellent until the reaction is about three-quarters complete; this shows a limiting level of about 60% substitution. Better agreement can be obtained up to the limit, if a secondary process of steric control by the substituant in a partially substituted mr triad is assumed. Other possibilities for that secondary process are discussed.
    Zusätzliches Material: 21 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1986.080240804
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  • 4
    Digitale Medien
    Digitale Medien
    Organochlorine pesticides by negative ion chemical ionization. Brain metabolites of lindane (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1988), S. 279-284 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A gas chromatographic/mass spectrometric technique for the analysis of organochlorine compounds using negative ion chemical ionization is presented. Detection limits for some compounds (penta- and hexachlorobenzene and p,p′-DDE) are of the order of 60-120 fg injected, while others (lindane, aldrin, etc.) are in the low picogram range (1.0 pg for lindane). The extreme selectivity for chlorine-containing compounds enables the direct analysis of homogenates of biological samples without any extraction or purification step. Metabolic studies can thus be remarkably simplified. Results are presented on the application of this technique to the analysis of lindane metabolites found in rat brain after treatment with this pesticide.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200160154
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  • 5
    Digitale Medien
    Digitale Medien
    A comprehensive approach to the stereochemical and physical factors in nucleophilic substitution on PVC in the melt (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1685-1698 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The nucleophilic substitution reactin of poly(vinyl chloride) (PVC) with sodium benzenethiolate (NaBT) has been studied in the melt with the aim of determining whether a conformational mechanism is applicable under conditions that would apply in the polymer processing. The evolution of unreacted syndio, hetero, and isotactic triads content, and of the apparent molecular weight has been followed by 13C-NMR and GPC, respectively. The kinetic behavior was defined by choosing appropriate mixing conditions of temperature, shear stress, load, and amount of plasticizer. In all cases the kinetic curves attain a plateau after a rather fast reaction period has elapsed. The conversion at the plateau, that is, the reaction efficiency, proved to depend linearly on the amount of nucleophile and is hardly influenced by the mixing conditions for a given stoichiometric composition. The mixing conditions have been found to affect markedly the kinetics but to be quite inoperative on the evolution of both the content of unreacted tactic triads and the apparent molecular weight with degree of conversion. The results are discussed by taking into consideration those previously obtained in solution.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1989.070380909
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  • 6
    Digitale Medien
    Digitale Medien
    Instrument-independent database for collisionally activated dissociation in RF-only quadrupoles. The case of C2H3O+ and C3H7+ (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 377-380 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Dynamically correct (i.e., instrument-independent) branching ratios can be measured under single-collision conditions in tandem mass spectrometers incorporating RF-only quadrupole collision cells. The absolute branching ratios were measured as a function of the center-of-mass interaction energy ECM for the collisionally activated dissociation (CAD) of CH3CO+ (m/z43) from several source compounds (ethanol, oxirane), and CH3CO-X (where X = H, CH3, CH3CH2, CH3CO, CH3COCH2, and C6H5)). The energy dependences of the branching ratios for C2H3O+ from CH3CO-X source compounds are quite distinct from those observed for C2H3O+ from ethanol or ethylene oxide, or for the C3H+7 ions (also m/z 43) from n-pentane. Hence, one can use the CAD of m/z 43 to distinguish CH3CO-X compounds from other source compounds, including sources of C3H7+ ions. Therefore, the characteristic branching ratios of ionic substructures may provide for tandem mass spectrometry a „fingerprinting“ capability analogous to the use of group frequencies in infrared spectroscopy.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290031102
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  • 7
    Digitale Medien
    Digitale Medien
    Photolithography of polytetrafluoroethylene for adhesion (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 2529-2536 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Irradiation of polytetrafluoroethylene (PTFE) with Mg(Kα) X-rays is shown to protect the surface against the chemical etching steps used to prepare PTFE for adhesion. Preirradiated etched samples of PTFE have adhesion strengths to epoxies of less than 3% of that for nonirradiated etched samples. The major portion of this decrease in adhesion strength occurs for X-ray exposures of less than 10 min and failure in every case occurs in PTFE and not in the bonded transition region. XPS measurements (20 Å sampling depth) show little difference in F content between irradiated and nonirradiated samples, but thermal desorption shows increasing short chain fluorocarbon desorption with irradiation time. These results are consistent with previous studies showing that irradiation produces free radicals that lead to branching and/or crosslinking, and a surface rich in low molecular weight fluorocarbons. The crosslinked surface is resistant to deep (10,000 Å) chemical attack and rich in short chain fluorocarbons; both effects are expected to lead to weak adhesive bonding.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1989.070370906
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  • 8
    Digitale Medien
    Digitale Medien
    Single-column ion chromatography for the determination of chloride, sulfate, and nitrate in water (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 568-569 
    Details
    ISSN: 0935-6304
    Schlagwort(e): HPLC-IC ; Inorganic anions ; Water analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240120822
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  • 9
    Digitale Medien
    Digitale Medien
    Study on the System CoSeO4—NiSeO4—H2O at 30°C Crystal Structure of CoSeO4 · 5 H2O (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 528 (1985), S. 183-190 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Das System CoSeO4-NiSeO4—H2O bei 30°C. Kristallstruktur des CoSeO4 · 5 H2OEs wird das System CoSeO4—NiSeO4—H2O bei 30°C untersucht. Die Kristallwerden aus wäßriger Lösung durch langsames Eindampfen erhalten. Die gefundenen Phasen sind CoSeO4 · 5 H2O und NiSeO4 · 6 H2O; CoSeO4 · 6 H2O wird dann gefunden, wenn die Kristallisation der Co-Verbindung in Gegenwart von Ni erfolgt. Diese drei Phasen zeigen einen begrenzten Ersatz des Metalls auf Grund von Röntgenpulverdaten. Die Kristallstruktur des CoSeO4 · 5 H2O ist triklin, a = 6.435(1), b = 10,703(2), c = 6,220(1) Å, α = 98,71(1), β = 109,60(2), γ = 75,54(1)°, P1, Z = 2. Verfeinerung bis zu R = 0,032 für alle beobachteten Reflexe. Die Kristallstruktur ist isostrukturell zu CuSO4 · 5 H2O und besteht aus Ketten von Co(H2O)4-Ionen parallel zu [110], die brückengebunden über die SeO4-Anionen sind. Das fünfte Wassermolekül wirkt als Puffer.
    Notizen: A study of the system CoSeO4—NiSeO4—H2O at 30°C has been carried out. Crystals were obtained by slow evaporation from a water solution. The identified phases were CoSeO4 · 5 H2O and NiSeO4 · 6 H2O, but CoSeO4 · 6 H2O is identified when the crystallization of Co compound is carried out in presence of Ni. The three phases show a limited replacement of metal according to X-ray powder results. The crystal structure of CoSeO4 · 5 H2O has been solved, the come pound is triclinic, a = 6.435(1), b = 10.703(2), c = 6.220(1) Å, α = 98.71(1), β = 109.60(2), γ = 75.54(1)°, P1, Z = 2. Refinement was terminated at R = 0.035 for all observed reflections. The crystal structure is isostructural to CuSO4 · 5 H2O and consists of Co(H2O)4 ions chains parallel to [110] μ-linked by the SeO4. The fifth water molecule acts as buffer.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19855280921
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  • 10
    Digitale Medien
    Digitale Medien
    Complexes of IIB Metal Halides with N,N-Diethylbenzenecarbothioamide crystal structure of [Hg{C6H5C(S)N(C2H5)2}I2]2 (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 539 (1986), S. 219-228 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Komplexe von IIB Metall-halogeniden mit N,N-Diethylbenzocarbothioamiden. Kristallstruktur von [Hg{C6H5C(S)N(C2H5)2}I2]2Verschiedene Komplexe von N,N-Diethylbenzocarbothioamide (DEBCTA) mit MX2 (M = Zn, Cd oder Hg und X = Cl, Br oder I) wurden hergestellt und mittels Elementaranalyse, Molgewichtsbestimmung, IR, 1H-NMR-Spektren und konduktometrischen Messungen untersucht. Die Kristallstruktur von [Hg(DEBCTA)I2]2 wurde mit Hilfe von Röntgenbeugungsdaten ermittelt (2402 beobachtete unabhängige Reflexe, R = 0,097). [Hg(DEBCTA)I2]2 kristallisiert monoklin in der Raumgruppe P21/n mit zwei Formeleinheiten pro Elementarzelle; Gitterkonstanten a = 1383,9(2), b = 834,3(1), c = 1 418,1(2) pm, β = 101,03(1)°. Im dimeren Komplex sind die verzerrt-tetraedrisch koordinierten Hg-Atome von je einem S-Atom des Liganden, einem terminalen I-Atom und zwei verbrückenden I-Atomen umgeben.
    Notizen: Complexes having the empirical formulae M(DEBCTA)2X2 (M = Zn or Cd, X = Br or I, DEBCTA = N,N-diethylbenzenecarbothioamide), Zn(DEBCTA)Cl2, Cd2(DEBCTA)Cl4 and Hg(DEBCTA)X2 (X = Cl, Br or I) were made by reaction of zinc, cadmium or mercury dihalides in ethanol or 1,2-dichloroethane. All complexes have been characterized by elemental analysis, conductance and molecular weight measurements and by infrared and 1H-NMR spectral studies. In addition, the structure of [Hg(DEBCTA)I2]2 has been determined by single-crystal X-ray crystallography and refined to a conventional R factor of 0.097. The compound crystallizes in the monoclinic space group P21/n with a = 1383.9(2), b = 834.3(1), c = 1418.2(2) pm, β = 101.03(1)° and Z = 2. The molecule was found to have a dimeric structure involving two asymmetrical iodine bridges in which the Hg atom lies a tetrahedral environment and the ligands lie mutually trans with respect to one another.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19865390823
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