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  • 1
    Electronic Resource
    Electronic Resource
    High resolution 1H NMR spectra of 2,2′-biquinoline (1982)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 18 (1982), S. 42-44 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From analysis and refinement by the LAOCOON III program of the 220 MHz 1H spectrum of 2,2′-biquinoline, recorded as a saturated solution in carbon disulphide, most derived chemical shifts and coupling constants are close to corresponding values in quinoline. However, H-3 is at 1.5 ppm lower field in 2,2′-biquinoline than in quinoline and the ortho-coupling 3J(34) in the heterocyclic ring is 0.5 Hz larger in 2,2′-biquinoline than in quinoline; fairly free rotation about the 2,2′ bond is inferred.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270180110
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution NMR spectra of fluorene and its derivatives: VIFor Part V see Ref. 2. - 1-methylfluorene, truxene and decacyclene (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 272-277 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The overlapping spin systems in the 220 MHz 1H spectra of 1-methylfluorene (1) in carbon disulphide and deuteriated chloroform solutions have been analysed separately and refined by LAOCOON with the aid of methyl- and methylene-decoupled spectra. Ortho-coupling constants in the 6-membered rings are similar to each other and to those in fluorene (4). Solvent and concentration shifts suggest loose pairing of solute molecules. 220 MHz 1H spectra of α-truxene (2) in carbon tetrachloride and deuteriated nitrobenzene, 220 MHz 1H spectra of decacyclene (3) in carbon tetrachloride, and 90 MHz FT 1H spectra of 3 in deuteriated chloroform show steric deshielding; the solvent dependence of shifts also suggests solute pairing in 2. Shifts in 1H decoupled 22.6 MHz 13C spectra of 2 in deuteriated chloroform were assigned with the aid of Cr(acac)3 relaxation agent.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270140410
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  • 3
    Electronic Resource
    Electronic Resource
    Deuterium isotope effects on 13C NMR chemical shifts in 7,12-dimethylbenz[a]anthracene (1985)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 23 (1985), S. 787-789 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 100.6 MHz 13C off-resonance-decoupled and polarization-transfer NMR spectra of 7,12-dimethylbenz[a]anthracene and its 5-deuteriated analogue in deuteriated chloroform solution enabled assignments of the shifts of C-3 and C-5 to be revised, and other spectral ambiguities to be reduced. Negative, i.e. upfield, deuterium-induced secondary isotope shifts, Δδ = δ(C…D) - δ(C…H), were evident over one, two, three and four bonds and, also, small apparently significant positive shifts to the methyl carbons at the 7- and 12-positions, i.e. over five and six bonds, respectively. 13C—1H coupling constants were unaffected by the deuteriation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260230922
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and high-resolution 1H NMR spectra of four dimethylaminated dipyridyl ketones (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 897-899 
    Details
    ISSN: 0749-1581
    Keywords: Dipyridyl ketones ; Dipyridylmethanones ; 1H NMR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four new dimethylaminated pyridoylpyridine intermediates, bis(3-dimethylamino-2-pyridyl) ketone (1), 6-dimethylamino-3-pyridyl 4-pyridyl ketone (2), 6-dimethylamino-3-pyridyl 3-pyridyl ketone (3) and 6-dimethylamino-3-pyridyl 2-pyridyl ketone (4), have been synthesized and their 100 MHz 1H NMR spectra analysed iteratively as ABC, ABCX and ABXY spin systems. In 2-4 the H-5 shift ortho to the dimethylamino substituent is unaffected by the orientation of the pyridyl substituent, but H-4 and H-2 are increasingly deshielded in the sequence 2-4. In 3, when benzene-d6 replaces chloroform-d1 as solvent, H-5′ and H-4′ in the unsubstituted pyridyl ring suffer appreciable upfield shifts.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260241010
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