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  • 1
    Electronic Resource
    Electronic Resource
    Structure and fragmentation mechanisms of some ions in the mass spectrum of ephedrinePresented in part at the 89th Annual Meeting of the AOAC, Washington, D.C., U.S.A., 15 October 1975. (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. 129-133 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes the use of gas chromatography mass spectrometry for the confirmation of ephedrine in adulterated powdered ipecac and ipecac fluid extract. Deuteration studies of ephedrine hydrochloride and some related compounds were also performed in an attempt to postulate structures for some of the fragment ions appearing in the spectrum of ephedrine.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200040302
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  • 2
    Electronic Resource
    Electronic Resource
    Silicon-29 and carbon-13 NMR studies of organosilicon chemistry. II - The Methylethoxysilanes MenSi(OEt)4-n (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 460-464 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Silicon-29, carbon-13 and oxygen-17 NMR data are reported for the methylethoxysilanes, MenSi(OEt)4-n with n = C to 3. The values of 1J(SiC) vary greatly, in a manner which appears to be inconsistent with an effect of s-character variation alone. The chemical shifts are discussed in terms of possible π-bonding. Silicon-29 and carbon-13 spin-lattice relaxation times and nuclear Overhauser effects are also reported and discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070913
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  • 3
    Electronic Resource
    Electronic Resource
    Carbon-13 spin-lattice relaxation times as a probe for the study of electron donor-acceptor complexes (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 113-115 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C spin-lattice relaxation times (T1's) are reported for C-3 of 2-methylindole (methyl,3-13C2) as a function of the concentration of added 1,3,5-trinitrobenzene at 35°C in 1,2-dichloroethane. The observed decreases in T1, with increasing concentrations of 1,3,5-trinitrobenzene, are interpreted in terms of longer time-averaged correlation times which result from (a) the formation of increasing amounts of electron donor-acceptor complex and (b) increases in viscosity. An equation is derived which makes it possible to obtain estimates of the equilibrium constant for complex formation, and the spin-lattice relaxation time of the complex, from the observed T1's and viscosity measurements. From the data obtained, values of 6.4 × 10-12 and 14.1 × 10-12 s rad-1 were calculated for the effective correlation times (at 35°C and 0.686 centipoise) and 0.21 and 0.28 nm for the effective radii of free and complexed donor respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090213
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  • 4
    Electronic Resource
    Electronic Resource
    The electron impact induced fragmentation of geminal dialkanoates (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1977), S. 216-221 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of representative 1,1-dicarboxylates have been studied in order to identify fragmentation patterns typical of such compounds and thus to aid their characterization in complex mixtures. Two typical decomposition pathways were noted. One invoves the loss of a carboxylate group, and the other the ejction of an sliphatic sidechain. It is suggested that a similar gragmentation scheme is to be expected of the much more labile dialkanoates derived from ketones.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210120408
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