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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for a [2+4] cycloaddition in the ion-molecule reaction of ionized 1,3-butadiene with vinyl ethyl (methyl) ether in the gas phase (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 729-732 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By use of deuterium labelling it is shown that the radical cation of 1,3-butadiene reacts with vinyl methyl (or ethyl) ether in the gas phase through a [2+4] cycloaddition reaction. This leads to an excited collision complex of ionized 4-methoxy- (or ethoxy) cyclohexene, which expels mthanol (or ethanol) through a 1,3 elimination, as does 4-methoxycyclohexene itself upon electron impact. The spectrum of daughter ions produced by collision induced decomposition of the resulting ion with m/e 80 has been compared with spectra produced by the collision induced decompositions of the m/e 80 ions given by 1,3-cyclohexadiene, 1,4-cyclohexadiene, 1,3,5-hexatriene and the [M-MeOH]\documentclass{article}\pagestyle{empty}\begin{document}$\mathop +\limits_\cdot$\end{document} ion from 4-methoxycyclohexene.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210131212
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  • 2
    Electronic Resource
    Electronic Resource
    The use of ion-molecule reactions in the mass spectrometric location of double bonds (1976)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 867-872 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method for the location of the positions of carbon-carbon double bonds using high pressure mass spectrometry is proposed. A known olefinic molecular ion reacts with a second, unknown olefin to form a four-centre complex, which fragments with retention of the structural identity of methylene and substituted methylene groups to eliminate a new olefin molecule and to form an unsaturated ion from which the position of the double bond in the unknown olefin can be inferred. Vinyl methyl ether proved to be a convenient reagent gas and its molecular ion undergoes the required reaction with several classes of olefinic compound. Conjugated dienes and unsaturated compounds containing electronegative groups do not undergo this reaction.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210110812
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  • 3
    Electronic Resource
    Electronic Resource
    Two-dimensional mass spectra of 2-phenylethylamines (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 1255-1259 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The two-dimensional mass spectra (metastable mapping) of ten biogenic amines derived from the amino acid 2-phenylalanine are described. This technique permitted the identification of almost all the fragmentations of singly and doubly charged positive ions formed by electron impact and decomposing in the different parts of a reverse-geometry mass spectrometer. The results obtained are discussed in order to establish the main fragmentation pathways common to all the amines belonging to the general class of 2-phenylethylamines and to identify the fragmentations characteristic of each amine.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300907
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  • 4
    Electronic Resource
    Electronic Resource
    Vibrational spectra of some double chromates of the type LnK (CrO4)2 (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 27-30 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman and infrared spectra of a series of double chromates of the type Lnk(CrO4)2, with Ln = La, Pr, Nd, Sm, were recorded and discussed with the aid of a factor group analysis. These substances constitute the first example showing the intercalation of v1 between v3 components in crystalline chromates. The spectroscopic results confirm again the structural differences between these chromates and PbCrO4 (synthetic crocoite), which was also investigated for comparison.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210106
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  • 5
    Electronic Resource
    Electronic Resource
    Infrared, Raman and pre-resonance Raman spectra of vanadyl(IV) tetraphenylporphyrin (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 23 (1992), S. 489-494 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The infrared and Raman spectra of vanadyl(IV) tetraphenylporphyrin were recorded between 1600 and 200 cm-1. Assignment of most of the vibrational modes was done by comparison with other related compounds. The V—N and V=O metal - ligand vibrations could be clearly identified. Pre-resonance experiments were performed, using different radiation from an argon ion laser, in the energy range between the main electronic transitions of the complex [the Soret band and the (α + β) doublet]. Analysis of the excitation profiles suggests that all the enhanced bands contribute to both the A and B terms of Albrecht's equation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250230905
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  • 6
    Electronic Resource
    Electronic Resource
    1H 2D-NMR characterization of Ni(II)-substituted azurin from Pseudomonas aeruginosa (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. S41 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; Two-dimensional NMR ; Azurin ; Nickel(II)-azurin ; Paramagnetic metalloproteins ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H two-dimensional NMR experiments on nickel(II)-substituted azurin have been successfully applied. Despite the short relaxation times of the hyperfine-shifted resonances, the combined use of NOESY and COSY spectra allowed the assignment of 15 resonances belonging to the metal-coordinated residues Gly-45, His-46, His-117 and Met-121. Even in the case of the two broad and furthest downfield resonances, the NOESY spectra were successful in assigning these signals to the β-CH2 protons of Cys-112. The protons of the non-coordinated residues Met-13, Phe-15 and Trp-48 were also assigned via NOESY, COSY and TOCSY experiments.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260311310
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