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  • Wiley-Blackwell  (1,928)
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  • 1
    Electronic Resource
    Electronic Resource
    Reactions of Cadmium(II) Acetate with Acetoacetanilide and Methylacetoacetate Thiosemicarbazones: A Cyclization Process Leading to a Pyrazolone - The Molecular and Crystal Structures of the Free Ligands and the Complex [CdL2Py] (HL = 2-[Amino(thioxo)methyl]-5-methyl-2,3-dihydro-1H-3-pyrazolone, Py = Pyridine) (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 83-89 
    Details
    ISSN: 1434-1948
    Keywords: Cadmium(II) pyrazolonates ; Thiosemicarbazones ; Cyclizations ; 2-[Amino(thioxo)methyl]-3-pyrazolone ; 1H-, 13C-, 113Cd-NMR spectra ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acetoacetanilide- and methylacetoacetate thiosemicarbazones (HTSC1 and HTSC2, respectively) react with cadmium(II) acetate in methanol, giving complexes containing the ligand 2-[amino(thioxo)methyl]-5-methyl-2,3-dihydro-1H-3-pyrazolonate (L-). An X-ray diffraction study of the structures of HTSC1, HTSC2, HL, and [CdL2Py], identified the main structural changes in the cyclization process. Additionally, the coordination of the metal in the complexes [CdL(AcO)] · 2 MeOH and [CdL2] · 3 H2O was analyzed using IR spectroscopy in the solid state and 1H-, 13C-, and 113Cd-NMR spectroscopy in solution. On reaction with aqueous trifluoroacetic acid, both complexes releases the free pyrazolone, which can be easily isolated.
    Additional Material: 2 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Beiträge zur systematischen Verwandtschaftslehre. 100 (1942)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 249 (1942), S. 1-22 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19422490101
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of Pollutant Phenols by Capillary High-Performance Liquid Chromatography with UV Detection (2000)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 367-372 
    Details
    ISSN: 0935-6304
    Keywords: Capillary HPLC ; gradient elution ; temperature programming ; phenolic compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---This paper describes a liquid chromatographic method using a reversed phase capillary column coupled to an UV detector for the quantitation of thirteen pollutant phenols. Chromatographic separation was carried out with gradient elution at 25.0 ± 0.1°C. The two major anisocratic elution modes (gradient elution and temperature programming) were evaluated. The detection limit range was 10-81 pg (100 nL injected). The chromatographic method combined with liquid-liquid extraction was applied to analysis of these compounds in river water. Recoveries of 75-103% were achieved for most of them.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    PCB separation by HRGC-MS. Fourier analysis for characterizing Aroclor chromatograms (1994)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 839-850 
    Details
    ISSN: 0935-6304
    Keywords: Capillary GC ; Chemometry ; Fourier analysis ; Multicomponent mixture chromatograms ; PCB analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aroclor and Aroclor mixture chromatograms obtained using temperature programmed high resolution capillary GC coupled with mass spectrometric selective detection have been investigated by Fourier analysis developed for the study of multicomponent chromatograms. The experimental autocorrelation function (EACF), i.e. peak shape and position correlation, showed a retention - structure pattern which could be associated with both the type of Aroclor and the ion used for selective ion monitoring (m/z value). In particular, o-m and m-m isomerization effects were singled out by EACF analysis. By fitting EACF with previously developed theoretical models, it was possible to characterize a specific Aroclor in terms of the number of PCB congeners present in it. The results obtained agreed closely with the typical Aroclor content. For the Aroclor mixture, the distribution of inter-distance between successive peaks was derived. The two first distribution moments obtained agreed with those derived from retention data reported in the literature. The consequences on the separation performance, i.e. the number of singlets, doublets, etc. in the chromatogram, are discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240171207
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  • 5
    Electronic Resource
    Electronic Resource
    Square wave adsorptive stripping voltammetry of nickel(II) in flowing systems at a wall-jet mercury film electrode plated in situ (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 145-149 
    Details
    ISSN: 1040-0397
    Keywords: Nickel ; Adsorptive stripping voltammetry ; Square wave voltammetry ; Flow analysis ; Wall-jet mercury film electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A rapid and highly sensitive adsorptive stripping voltammetry method for the measurement of traces of nickel(II) in flowing systems is described. The method involves a mass-transport controlled preconcentration step, during which the NiII-dimethylglyoxime complex is adsorbed onto an in situ plated mercury film wall-jet electrode, followed by a reductive square wave stripping scan. The optimization of the experimental conditions and square wave parameters was carried out in order to achieve high sensitivity, reproducibility and fast response. The detection limit, restricted by the amount of nickel in the blank solution, was found to be 1.3 × 10-10 M, with a relative standard deviation of ±12.2% (n = 15), for a 1-min accumulation time. Linear calibration plots were obtained up to 8 × 10-10 M. This method can be applied to continuous on-line monitoring of trace levels of nickel in flowing systems, enabling easy automation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090211
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  • 6
    Electronic Resource
    Electronic Resource
    A short synthesis of dimethyl tricyclo[3.3.0.03,7]octane-1,5-dicarboxylate and its 3,7-dimethyl derivative. A new route to the tricyclo[3.3.0.03,7]octane skeleton (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 647-654 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Eine kurze Synthese von Tricyclo [3.3.0.03,7]octan-1,5-dicarbonsäure-dimethylester und seines 3,7-Dimethylderivats. Ein neuer Weg zum Tricyclo [3.3.0.03,7]octan-GerüstDie 5-stufige Synthese von Tricyclo[3.3.0.03,7]octan-1,5-dicarbonsäure-dimethylester (13) und seines 3,7-Dimethylderivats 14 ausgehend von den leicht zugänglichen cis-Bicyclo[3.3.0]octan-3,7-dionen 1 bzw. 2 wird beschrieben. Schlüsselreaktion ist die Oxidation der Bis-enolate der cis-Bicyclo[3.3.0]octan-3,7-dicarbonsäure-dimethylester 11 und 12 mit Iod zum Tricyclo-[3.3.0.03,7]octan-Derivat 13 bzw. 14. Zusätzlich wird die Synthese des Diesters 13 nach bekannten Methoden versucht.
    Notes: Five-step syntheses of dimethyl tricyclo[3.3.0.03,7]octane-1,5-dicarboxylate (13) and its 3,7-dimethyl derivative 14 from the readily available cis-bicyclo[3.3.0]octane-3,7-diones 1 and 2, respectively, are described. The key-step implies the iodine oxidation of the bis-enolate derived from the corresponding dimethyl cis-bicyclo-[3.3.0]octane-3,7-dicarboxylates 11 and 12, thus being developed a new synthetic entry into the tricyclo[3.3.0.03,7]octane skeleton. Also, some attempts to synthesize diester 13 by using known methodology for the synthesis of compounds containing this tricyclic skeleton are described.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210410
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  • 7
    Electronic Resource
    Electronic Resource
    Study of the ligand substitution reaction Fe (CN)5H2O3- + pyrazine in micellar solutions (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 29 (1997), S. 377-384 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ligand substitution reaction Fe(CN)5H2O3- + pyrazine → Fe(CN)5 pyrazine3- + H2O has been studied in sodium dodecyl sulfate SDS, hexadecyltrimethylammonium bromide, CTAB, and salt aqueous solutions at 298.2 K. Kinetics were studied in dilute and concentrated salt solutions and in SDS and CTAB solutions at surfactant concentrations below and above the critical micelle concentration. Experimental results show that salt effects can be explained by considering the interaction between the cations present in the working media which come from the background electrolyte, and the Fe(CN)5H2O3- species in the vicinity of the cyanide ligands. This interaction makes the release of the aqua ligand from the inner-coordination shell of the iron(II) complex to the bulk more difficult resulting in a decrease of the reaction rate when the electrolyte concentration increases. Kinetic data in surfactant solutions show that not only micellized surfactants are operative kinetically, but also nonmicellized surfactants are influencing the reactivity. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 377-384, 1997
    Additional Material: 4 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Substituent effects on the enantioselective retention of anti-HIV 5-aryl-Δ2-1,2,4-oxadiazolines on R, R-DACH-DNB chiral stationary phase (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 8 (1996), S. 556-566 
    Details
    ISSN: 0899-0042
    Keywords: enantioselective chromatography ; oxadiazolines ; quantitative structure-enantioselective retention relationships ; comparative molecular field analysis ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of racemic 3-phenyl-4-(1-adamantyl)-5-X-phenyl-Δ2-1,2,4-oxadiazolines (PAdOx) were directly resolved by HPLC using a Pirkle-type stationary phase containing N,N′-(3,5-dinitrobenzoyl)-1 (R),2(R)-diaminocyclohexane as chiral selector. The more retained enantiomers have S configuration, as demonstrated by X-ray crystallography and circular dichroism measurements. The influence of aromatic ring substituents on enantioselective retention was quantitatively assessed by traditional linear free energy-related (LFER) equations and comparative molecular field analysis (CoMFA). In good agreement with previous findings, the results from this study indicate that the increase in retention (k′) is favoured mainly by the π-basicity and the hydrophilicity of solute, whereas enantioselectivity (α) can be satisfactorily modeled by electronic and bulk parameters or CoMFA descriptors. The LFER equations and CoMFA models gave helpful insights into chiral recognition mechanisms. Chirality 8:556-566, 1996. © 1997 Wiley-Liss, Inc.
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  • 9
    Electronic Resource
    Electronic Resource
    Chiral synthesis and pharmacological evaluation of the enantiomers of SM32, a new analgesic and cognition-enhancing agent (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 8 (1996), S. 579-584 
    Details
    ISSN: 0899-0042
    Keywords: α-tropyl esters ; analgesic ; cognition-enhancer ; ACh releaser ; enantioselectivity ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enantiomers of 3-α-tropyl 2-(phenylthio)butyrate (SM32, 1) were prepared by chiral synthesis and tested for analgesic, cognition-enhancing, and ACh-releasing properties. They show enantioselectivity in some of the tests, the eutomer being related in configuration to R-(+)-hyoscyamine. Chirality 8:579-584, 1996. © 1997 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Liquid phase oxidation of α-pinene initiated by ozone. 1. Conversion of α-pinene and formation of its hydroperoxide (1993)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 16 (1993), S. 68-74 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The use of ozone as initiating agent in the liquid phase oxidation of α-pinene has been investigated. The first intermediate product of the reaction is the hydroperoxide of α-pinene. Both, ozone partial pressure and its initiation time exert an inhibiting effect on the conversion of α-pinene but yield higher selectivities for the hydroperoxide of α-pinene compared with those of oxidation without ozone. In all cases, temperature was found to be the most important variable affecting the oxidation rate. From a mechanism of radical reactions, kinetic equations, consistent with the experimental results, corresponding to α-pinene oxidation rate and net formation rate of its hydroperoxide, were obtained. The rate constants are given as functions of temperature. The results also suggest that a fraction of the hydroperoxy radicals decomposes to yield other products such as verbenol and verbenone, identified in this work, and whose kinetics will be reported in a later paper.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270160112
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