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  • Analytical Chemistry and Spectroscopy  (28)
  • Wiley-Blackwell  (28)
  • 11
    Electronic Resource
    Electronic Resource
    Rationalization of the relative hydrophobicity of some common bile acids by infrared and Raman spectroscopy (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 3 (1997), S. 393-401 
    Details
    ISSN: 1075-4261
    Keywords: hydrophobic/hydrophilic bile acids ; hydrophobicity index ; hydrogen-bonding ; intermolecular forces ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The analysis of some bile acids [lithocholic acid (LC), cholic acid (C), chenodeoxycholic acid (CDC), hyodeoxycholic acid (HDC), ursodeoxycholic acid (UDC), β-muricholic acid (β-MC)] by Raman and infrared spectroscopy reveals that hydrophobic bile acids (LC, CDC, C) have their 3α OH bonded by strong intermolecular interactions. Furthermore, the most hydrophobic bile acid (LC), which is practically insoluble in water at room temperature, may be directly related to a polymeric association of its molecules. The hydrophilic bile acids (HDC, UDC, β-MC) possess some free OH bonds. Generally, however, the carboxylic group is implied in a dimeric association. Infrared spectra of diluted bile acids in chloroform give further confirmation because intermolecular bonded line vanishes for the hydrophilic bile acids and remains for hydrophobic ones. Thus, Raman and infrared spectroscopy provide new tools for establishing a rational hydrophobicity/hydrophilicity scale of bile acids. © 1997 John Wiley & Sons, Inc. Biospectroscopy 3: 393-401, 1997
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Development of a method for the rapid determination of pentachlorophenol in leather using supercritical fluid extraction with in situ derivatization (1996)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 19 (1996), S. 267-271 
    Details
    ISSN: 0935-6304
    Keywords: Supercritical fluid extraction (SFE) ; In situ derivatization ; Pentachlorophenol (PCP) ; Leather ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pentachlorophenol (PCP) was extracted from leather with supercritical carbon dioxide and in situ acetylated under static SFE conditions in the presence of triethylamine. During the dynamic extraction step, the derivatives were removed from the matrix and collected with either a pure liquid (light petroleum) or a liquid-solid (light petroleum-solid sorbent (C18, alumina, Florisil or Celite)) trap. To prevent restrictor plugging, a suitable restrictor was designed. The clean-up of the extracts was optimized in this study. Different internal standards were tested and it was shown that not all of them were usable. The SFE results were compared with those obtained by Soxhlet extraction with methanol. With SFE instead of conventional Soxhlet extraction, the overall time required for determination of PCP in leather can be reduced from about 2 days to approx. 3 hours.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240190506
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  • 13
    Electronic Resource
    Electronic Resource
    Chloro-bis-propyl Ethers in the Elbe River - Isomeric Distribution and Enantioselective Degradation (1998)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 21 (1998), S. 113-120 
    Details
    ISSN: 0935-6304
    Keywords: Enantioselective GC of chlorinated bis(propyl) ethers ; environmental analysis ; contamination of the Elbe River ; cyclodextrin derivatives ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Cyclodextrin derivatives are evaluated as chiral stationary phases for the enantiomer separation of chlorinated bis(propyl) ethers (BPE). The enantiomeric composition of the 2,3,2′,3′- and 1,3,2′,3′-isomers of tetrachlorobis(propyl) ether in the Elbe River has been quantitatively determined by enantioselective gas chromatography and coupled gas chromatography/mass spectrometry in selected-ion-monitoring mode. Significant enantiomeric discriminations are observed in selected water samples, indicating that enantioselective bio-degradation mechanisms are at least partly responsible for the overall degradation processes.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    31P-NMR-Daten heterocyclischer phosphine. Diastereomerenzuordnung an 1,3-Oxa-, 1,3-Aza- und 1,3-thiaphospholanen (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 470-474 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The diastereomers of 16 1,3-oxa-, 1,3-aza- and 1,3- thiaphospholanes were assigned by means of the coupling constants 2J(P—C—H) and 3J(P—C—CH3) and the linewidths of the 31P signals and 1H chemical shifts of CH3 groups. It is shown that the change in the 31P chemical shifts allows the estimation of the relative configuration in these compounds.
    Notes: Die Diastereomeren von 16 1,3 Oxa-, 1,3-Aza-und 1,3-Thiophospholanen wurden mit Hilfe der Kopplungs-konstanten 2J(P—C—H) und 3J(P—C—CH3), der Signalbreite der 31P-Signale und der 1H-chemischen Verschiebungen der CH3-Gruppen zugeordnet. Es wird gezeigt, daß auch die 31P-chemischen Verschiebungen eine Bestimmung der relativen Konfiguration dieser Verbindungen gestatten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270071003
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  • 15
    Electronic Resource
    Electronic Resource
    Collisional ionization of monocharged positive ions (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1977), S. 706-709 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Competitive fragementations of doubly charged ions formed by charge stripping have been observed for some hydrocarbon ions. The reproducibility of the abundance ratios indicates that they may be used to characterize the structural identity or non-identity of non-decomposing monocharged positive ions.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210121111
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  • 16
    Electronic Resource
    Electronic Resource
    Proton and 13C NMR spectra of substituted methyl cyanopropionates: Effects of molecular asymmetry (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 625-628 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton NMR spectra at 220 MHz of two series of substituted cyanopropionates, have been investigated. In addition the 13C spectra at 15 MHz of the series I were also studied. In I, where the R groups are diastereotopic, differences are observed in the proton chemical shifts of the CH3 groups in R for R = CH3, C2H5, n-C3H7, i-C3H7, n-C4H9, n-C5H11 and n-C6H13. In II [R′ = n-C3H7, CH(CH3)2, CH2CH(CH3)2 and C(CH3)3] diastereoisomers are found with substantial differences in chemical shifts between corresponding protons. Coupling constants are interpreted in terms of conformational preferences for certain molecules in both series.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270061204
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  • 17
    Electronic Resource
    Electronic Resource
    Mutual assignment of subspectra and substructures - A way to structure elucidation by 13C NMR spectroscopyPresented partly at the International Symposium on Computers in Analytical Chemistry, Vienna, September 1974. (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 97-106 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel approach to utilising digital computers and a collection of reference data for the interpretation of 13CNMR spectra is outlined. Because of the almost unlimited possibilities of molecular structures in organic chemistry, a matching of subspectra with substructures seems most appropriate, followed by an iterative confirmation of the suggested structures. For this purpose the possibility of a search for structure increments and the accompanying chemical shifts is provided by linking the spectroscopic and structural information using a formulae reading machine and generating the topological connectivity table. Three practical examples demonstrate the application of this set of programs and some of the experiences gained during operation.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070211
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  • 18
    Electronic Resource
    Electronic Resource
    NMR-daten substituierter 1,2-diphospholane sowie des 1,5-diphosphabicyclo[3.3.0]octans und seiner p-derivate (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 10 (1977), S. 172-174 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The structures of 1- and 2-substituted 1,2-diphospholanes and of 1,5-diphosphabicyclo[3.3.0]octane and its P-derivatives are elucidated, using their 13C and 13P-n.m.r. spectra. In case of the latter compounds the 31P-chemical shifts indicate an additional, sterically caused, interaction of the phosphorus atoms. Within the limits of n.m.r. sensitivity all compounds are sterically uniform.
    Notes: Anhand von 13C- und 31P-Spektren wird die Struktur 1- sowie 2-substituierter 1,2-Diphospholane, des 1,5-Diphosphabicyclo[3.3.0]octans und dessen P-Derivate ermittelt. Die 31P-chemischen Verschiebungen zeigen für letztere eine zusätzliche sterisch bedingte Wechselwrikung der Phosphoratome. Sämtliche Verbindungen sind innerhalb der NMR-spektroskopischen Nachweisgrenze sterisch einheitlich.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270100139
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  • 19
    Electronic Resource
    Electronic Resource
    Dissociations Induites par Collisions d'Ions Générés par Echange de Charges (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 207-208 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Collision induced dissociations of some molecular ions generated by electron impact or charge exchange from methane plasma are compared.
    Notes: Les dissociations induites par collisions d'ions moléculaires créés par impact d'électrons et par échange de charges dans une source d'ionisation chimique (méthane) sont comparés.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210130408
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  • 20
    Electronic Resource
    Electronic Resource
    A Karplus-type relationship for the vicinal coupling 3J(CCCP) in phosphonates (1978)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 50-51 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complete assignment of the 13C NMR spectrum of a conformationally rigid camphane phosphonate derivative leads to a Karplus-type function for the vicinal 3J(CCCP) coupling constants in phosphonates. The general applicability of this relationship is demonstrated.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270110115
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