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  • 1
    Electronic Resource
    Electronic Resource
    Application of dicyandiamide as a matrix additive in fast atom bombardment mass spectrometry (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 25 (1990), S. 317-322 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dicyandiamide (DCDA) is used as a chemical additive in the fast atom bombardment (FAB) matrix 3-mercaptopropane-l,2-diol (thioglycerol) and propane-l,2,3-triol (glycerol). It is demonstrated that DCDA can be used to generate adduct ions [M + H + DCDA]+ for a variety of common organic functional groups to confirm the molecular ion [M + H]+. It is particularly useful for aromatic and alkyl amines and these compounds were therefore investigated in greater detail. Primary and secondary amines on heating react with DCDA to produce biguanides. DCDA can be used as a derivatizing reagent, but the reaction times are typically longer than 12 h and, therefore, it has limited utility. Biguanides can be detected at the nanogram level in full-range FAB mass spectral analysis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210250606
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  • 2
    Electronic Resource
    Electronic Resource
    Structure elucidation of mercury (II) compounds by positive chemical ionization mass spectrometry (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 233-234 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    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/oms.1210220412
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Negative ion chemical ionization mass spectrometry - binding of molecules to bromide and iodide anions (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 24 (1989), S. 8-14 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The analytical potential of negative ion chemical ionization (NICI) mass spectrometry utilizing dibromodifluoro-methane (CF2Br2) and iodomethane (CH3I)/methane (CH4) as reagent gases is examined. The NICI mass spectrum of CF2Br2 contains Br-, [HBr2]- and [CF2Br3]- anions. Weak acids (i.e. those acids with approximately ΔH°(acid) values between 1674 and 1464 kJ mol-1) react with Br- to produce minor yields of the hydrogen-bonded bromide attachment [MH + Br]- anion or are unreactive. Strong acids (i.e. those acids with approximately ΔH°(acid) 〉 1464 kJ mol-1) produce primarily [MH + Br]- anions with a minor yield of proton transfer [M — H]- anion. The NICI spectrum of CH3I/CH4 is dominated by I-. Weak acids react with I- to yield minor amounts of [MH + 1]- or are unreactive. Strong acids produce only [MH + l]- anions. From a consideration of the gas-phase basicity of the halide anion and the binding energy of the hydrogen-bonded halide attachment adduct, thermochemical data are used as a potential guide to rationalize or predict the ions observed in NICI mass spectra.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210240103
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    1H and 13C NMR spectra of pseudomorphine and dimethylpseudomorphine (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 1018-1022 
    Details
    ISSN: 0749-1581
    Keywords: Pseudomorphine ; Dimethylpseudomorphine ; 1H and 13C NMR ; Chemical shift assignments ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H and 13C NMR spectra of 7,7′,8,8′-tetradehydro-4,5:4′,5′-diepoxy-17,17′-dimethyl-[2,2′-bimorphinan]-3,3′,6,6′-tetrol; [2,2′-bimorphine] (pseudomorphine) and 7,7′,8,8′-tetradehydro-4,5:4′,5′-diepoxy-17,17′-dimethyl-[2,2′-bimorphinan]-3,3′-dimethoxy-6,6′-diol; 2,2′-bimorphine (dimethylpseudomorphine) were measured and assigned using DEPT, COSY, HETCOR, NOESY, NOE difference techniques and selective proton decoupled carbon NMR experiments.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260281204
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    Paper (German National Licenses)
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