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  • Analytical Chemistry and Spectroscopy  (268)
  • Wiley-Blackwell  (268)
  • American Meteorological Society
  • 1970-1974  (244)
  • 1965-1969  (24)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (268)
  • American Meteorological Society
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Mass spectrometry of synthetic oligopeptides N, O-permethylated, N-acetylated derivativesAbbreviation: DMF = dimethylformamide. (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 175-189 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of a series of stable isotope derivatives aided a structure elucidation study of an amino acid amide (Tyr-NH2) and the following family of synthetic oligopeptides: Gly-Tyr-NH2, Gly-Gly-Tyr-NH2, Gln-Gly-Gly-Tyr-NH2, Gln-Gln-Gly-Gly-Tyr-NH2, Ala-Gln-Gln-Gly-Gly-Tyr-NH2, Ser-Ala-Gln-Gln-Gly-Gly-Tyr-NH2 and Lys-Ser-Ala-Gln-Gln-Gly-Gly-Tyr-NH2. This series of peptides was synthesized by classical methods. N,O-permethylated, N-acetylated derivatives were synthesized to provide sufficient volatility for mass spectrometry. Various combinations of stable isotope derivatives (CH3CO + CH3, CD3CO + CH3, CH3CO + CD3, CD3CO + CD3) confirmed proposed fragmentation pathways and corroborated hypothetical ion structures. This family of oligopeptides corresponds to the C-terminus of scotophobin.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200010307
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  • 2
    Electronic Resource
    Electronic Resource
    Multiple ion detection by accelerating voltage alternation in conjunction with voltage sweeping (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 418-422 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An analog multiple ion detection system has been developed for magnetic sector mass spectrometers based on accelerating voltage alternation in conjunction with the accurate maintenance of focusing by means of voltage sweeping, using a superimposed a.c. sine wave voltage. This multiple ion detector voltage sweep system is easily constructed, inexpensive and produces analytical data of much greater precision than that reported from conventional systems. The application of the multiple ion detector voltage sweep system to biomedical problems is illustrated by the development of a method for the determination of stable isotope enrichment in blood glucose and alanine in children infused with tetradeuterio-L-alanine and dideuterioglucose to study gluconeogenesis and glucose utilization in vivo.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200010610
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  • 3
    Electronic Resource
    Electronic Resource
    The field ionization spectra of some natural coumarins (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 5-9 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The field ionization and electron impact mass spectra of eleven coumarins have been compared. In the field ion spectra the molecular ions were the base peaks and structurally diagnostic fragment ions formed by direct cleavage were present, whereas the molecular ions were weak in the electron impact spectra and fragment ions formed by rearrangement were dominant. Crude coumarin mixtures obtained from natural sources have been successfully examined using field ionization and gas chromatography + field ionization mass spectrometry.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200010104
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  • 4
    Electronic Resource
    Electronic Resource
    NMR studies of sulphur heterocycles. IIFor Part I, see Ref. 1. - substituent effects in the thieno[2,3-b] [1]benzothiophene and thieno[3,2-b] [1]benzothiophene systems (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 293-297 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituent chemical shifts for the title systems have been determined at infinite dilution in CDCl3 from a study of 40 derivatives. An excellent correlation is found between the ortho effect of substituents in the thiophene ring and the corresponding effects in thiophene itself, indicating negligible perturbation by the fused rings. Long range effects of 2- and 3-substituents on the 5- and 6-protons are electronic in origin, but cannot be interpreted in terms of simple resonance theory. These long range effects correlate linearly with σp°. An O, S-cis conformation for the formyl group in 2-formyl-thieno[2,3-6][1]benzothiophene is adduced on the basis of chemical shifts.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060512
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  • 5
    Electronic Resource
    Electronic Resource
    Stéréochimie en pentacoordination. Apport des réactifs inducteurs de déplacement chimique à l'etude de spirophosphoranes à liaison P—H (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 340-345 
    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 NMR spectra of eight spirophosphoranes bearing a P—H bond have been recorded in the presence of europium NMR shift reagent. The spectra are simplified by addition of the europium chelate. The observed displacements in the proton NMR lines allow the assignment of the endo and exo signals in some cases. By addition of the NMR shift reagent, one observes a displacement in the phosphite-spirophosphorane equilibrium in some cases.
    Notes: Le spectre de Résonance Magnétique Nucléaire de huit spirophosphoranes à liaison P—H a été enregistré en présence de chélate d'europium. L'addition du complexe d'europium amène la levée partielle ou totale de dégénérescence des spectres. Les modifications observées dans les déplacements chimiques permettent de proposer une attribution de position endo ou exo de certains signaux. L'addition du complexe d'europium entraîne, dans certains cas, une modification de l'équilibre entre les formes phosphites et spirophosphoranes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060609
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  • 6
    Electronic Resource
    Electronic Resource
    Boron-carbon coupling constants: II - the tetraphenylborate anionFor Part I, see Ref. 1.See Ref. 2. (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 360-361 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Boron-carbon coupling constants were obtained from the 13C FT-NMR, 1H noise decoupled spectra of sodium tetraphenylboron and tetra-n-butylammonium tetraphenylboron. The appearance of the spectra, as well as values obtained for J(BC), are discussed and contrasted with previously published data.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060613
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  • 7
    Electronic Resource
    Electronic Resource
    The elimination of small neutral molecules in the mass spectra of substituted cyclic polyfluorinated alkenyl alcohols (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 461-474 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Twelve substituted cyclic polyfluorinated alkenyl alcohols are synthesized and studied by mass spectrometry. Their characteristic fragmentation modes are discussed. The consecutive eliminations of HF and CO are dominant features in these spectra.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210040147
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  • 8
    Electronic Resource
    Electronic Resource
    The proton chemical shifts of polychlorinated biphenyls (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 309-319 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A 220 MHz NMR spectrometer has been used to identify the structure of polychlorinated biphenyls (PCBs). The proton chemical shifts and approximate coupling constants of PCBs fractionated from Aroclor 1254 are given in the text. The spectra of model compounds are included in the supplement. The chemical shifts are also tabulated according to the ring substitution pattern, when it can be seen that the shifts change systematically with the degree of both the total ring substitution and the substitution in the positions ‘ortho’ to the bridging bond between the rings.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040210
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  • 9
    Electronic Resource
    Electronic Resource
    An NMR study of some substituted 1,3- and 1,4-bistrifluoromethylbenzenes (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 479-481 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contrary to an earlier report, the metallation of 1,3-bistrifluoromethylbenzene with n-butyllithium is found to take place at the 4- and 2-positions. Lithiation of 1,4-bistrifluoromethylbenzene and subsequent carboxylation gives exclusively the 2-carboxylic acid. Structures are assigned on the basis of PMR data (100 and 220 MHz). The effects of coupling between aromatic protons and trifluoromethyl groups and the aromatic chemical shifts brought about by esterification are discussed for a series of bistrifluoromethylbenzoic acids.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270051008
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of some phosphorus substituents on the carbon-13 chemical shifts of alkyl chains (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 503-507 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The carbon-13 NMR spectra of 16 aliphatic phosphorus compounds with -PCl2, -P(OCH3)2, -P(CH3)2 or -PS(CH3)2 groups were determined and interpreted on the basis of the usual α, β-deshielding and γ-shielding effects. The α-effects of all the groups were quite large (15 to 30 ppm), though the β-effects were small (0 to 3 ppm). The γ-effects were also small (0·2 to 1·6 ppm), but of significance in suggesting reduced steric compression relative to that found for methyl and most of the common organic functional groups. This may be attributed to the greater length of the C—P bond. The phosphorus-31 NMR spectra of these compounds also show the existence of interaction with γ-carbons by exhibiting small additive upfield shifts.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060912
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