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  • Analytical Chemistry and Spectroscopy  (7.072)
  • Chemical Engineering  (3.294)
  • 1990-1994  (10.366)
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  • 1
    Digitale Medien
    Digitale Medien
    1,2-Versus 1,4-reduction of α,β-unsaturated carbonyl compounds in the gas phase (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 1658-1664 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The regioselectivity involved in the gas-phase hydride reduction of α,β-unsaturated carbonyl compounds by pentacoordinate silicon hydride ions is investigated. The kinetics and product distributions of the reactions of acrolein, methyl vinyl ketone and cyclohex-2-enone with monoalkoxysiliconate ions of the general composition RSiH3(OR′)- were examined with the flowing afterglow-triple quadrupole technique. All three substrates react by hydride transfer and by formation of a siliconate adduct in which hydride reduction of the organic reactant has occurred. The structures of these adducts and the hydride transfer products were identified by various tandem mass spectrometric protocols, including analysis of competitive collision-induced dissociation (CID) reactions and comparisons of CID spectra obtained from reference ions with known structures. 1,4-Reduction forming an enolate ion product is found to be the dominant or exclusive process with all three substrates, i.e. acrolein (70 ± 5%), methyl vinyl ketone (72 ± 5%) and cyclohex-2-enone (100%). Comparisons are made between these gas-phase results and the regioselectivity reported for analogous condensed-phase reactions. The observed behavior is discussed in terms of the reaction thermochemistry.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210281243
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  • 2
    Digitale Medien
    Digitale Medien
    1,5-Pentanediol as a matrix for nagative-ion fast atom bombardment mass spectrometry (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 26 (1991), S. 1123-1124 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210261218
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  • 3
    Digitale Medien
    Digitale Medien
    10th Anniversary Meeting of the finnish Mass Spectrometry Group (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. i 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290050711
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  • 4
    Digitale Medien
    Digitale Medien
    113Cd NMR spectra of human serum transferrin (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. S110 
    Details
    ISSN: 0749-1581
    Schlagwort(e): NMR ; 113Cd NMR ; Transferrin ; Hydrogencarbonate ; N-lobe ; C-lobe ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The binding of Cd2+ to human serum transferrin (80 kDa) was studied by 113Cd NMR spectroscopy. At pH 7 in the presence of hydrogen-carbonate as synergistic anion, two resonances of similar intensity at 38.1 and 43.6 ppm were observed, consistent with Cd2+ binding to oxygen ligands and one nitrogen ligand in the specific metal-binding clefts of the N- and C-lobes of the protein.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260311321
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  • 5
    Digitale Medien
    Digitale Medien
    119Sn NMR characterization of the series of complex [Pt(SnClxBry)5]3- Anions (x + y = 3) extracted into chloroform using a liquid anion exchanger (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 158-162 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 119Sn NMR ; [Pt(SnClxBry)3]3- complexes ; Liquid-liquid extraction ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: In the presence of excess SnCl2 or SnBr2, 119Sn NMR spectroscopy shows that the complex anions [Pt(SnCl3)5]3- or [Pt(SnBr3)5]3- are exclusively extracted into chloroform containing methyltrioctylammonium chloride or bromide. Significantly, in the presence of even small amounts of chloride ion, halogen scrambling of the [Pt(SnBr3)5]3- complex anion occurs, resulting in a distribution of the [Pt(SnClxBry)5]3- species, all possible isomers of which can be observed in this solvent system at room temperature.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260300212
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  • 6
    Digitale Medien
    Digitale Medien
    119Sn NMR study of organotin compounds having intramolecular Sn - N coordination (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. S25 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 119Sn NMR ; Chemical shifts ; Intramolecular coordination ; Divalent organotin compounds ; Tetraorganotin compounds ; Triorganotin halides ; Diorganotin dihalides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 119Sn NMR data are reported for organotin compounds containing potentially C,N-chelating ligands capable of forming five- or six-membered chelate rings. The 119Sn chemical shifts of divalent organotin compounds containing such a ligand are found at relatively high frequency. Intramolecular coordination in tetraorganotin compounds has little influence on their 119Sn chemical shifts. However, additional coordination in tri- and di-organotin halides causes a large shift to lower frequency of about 100 ppm. Finally, for organotin compounds which exist as a diastereoisomeric mixture in solution, two well resolved 119Sn resonances are observed.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260291308
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  • 7
    Digitale Medien
    Digitale Medien
    133Cs, 1H two-dimensional heteronuclear Overhauser effect spectroscopy (HOESY): Structural analysis of organic caesium compounds by detection of short Cs,H contacts (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 494-499 
    Details
    ISSN: 0749-1581
    Schlagwort(e): Heteronuclear ; Overhauser effect ; HOSEY ; Caesium tetraphenylborate ; Crown ether ; Caesium alkoxide ; Ion pairs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Transient heteronuclear Overhauser effects were observed between 133Cs and 1H by two-dimensional heteronuclear Overhauser effect spectroscopy (HOESY). In caesium tetraphenylborate (CsBPh4) dissolved in pyridine-d5, Cs+ is tightly attached to the BPh4- anion, thus forming a contact ion pair (CIP). By contrast, after addition of one equivalent of the crown ether 18-crown-6, caesium is located intimately at the site of the crown ether whereas the tetraphenylborate anion is remote (solvent-separated ion pair, SSIP). The results are in agreement with experiments described earlier by Mei et al. Similar observations were made for caesium 3-methylpentyl 3-oxide in tetrahydrofuran-d8 solution. 133Cs, 1H HOESY indicates the presence of a contact ion pair. Steady-state 133Cs {1H} experiments on the latter compound reveal weak fractional enhancements of 0.2%.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260290514
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  • 8
    Digitale Medien
    Digitale Medien
    13C and 15N NMR study of 2,3-diphenyl-1,2,3,4-tetrazolium-5-aminides (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 200-202 
    Details
    ISSN: 0749-1581
    Schlagwort(e): Nitrogen NMR ; Mesoionic compounds ; Chain-ring valence tautomerism ; Structure determination ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 13C, 14N and 15N NMR data are reported for some mesoionic 2,3-diphenyltetrazoles with nitrogen-containing exocyclic groups, and the data confirm their cyclic structures. The protonated forms of these mesoionic structures contain hydrogen atoms at the exocyclic groups.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260310209
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  • 9
    Digitale Medien
    Digitale Medien
    13C and 15N NMR study of 2,3-diphenyltetrazolium-5-olate and 5-thiolate (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 1027-1029 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 13C and 15N NMR ; Olates ; Exocyclic substituents ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 13C and 15N NMR chemical shifts are reported for 2,3-diphenyltetrazolium-5-olate and -5-thiolate and some of their derivatives. The data for N-1 and C-5 provide a very satisfactory means of distinguishing between O and S as the exocyclic substituent. The reported chemical shifts are consistent with the presence of the cyclic structures shown, rather than of the corresponding non-cyclic structures.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260281206
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  • 10
    Digitale Medien
    Digitale Medien
    13C and 15N NMR study of derivatives of N-unsubstituted pyrrolidines (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 560-561 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 13C NMR ; 15N NMR ; Pyrrolidines ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 13C and 15N NMR data for twelve N-unsubstituted pyrrolidines are reported and cis and trans stereomers are assigned for 2,3-, 2,4- and 2,5-disubstituted compounds.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260280618
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