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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Empirical Increment System for Methyl Group Signals and Ringcurrent Effects on Proton NMR Spectra of Methyl-substituted Biphenyls36 methyl group NMR signals of 18 methyl-substituted biphenyl derivates have been analyzed by multiple linear regression analysis to derive 4,4′- and 2,2′-position substitution constants. The influence of the torsional angle Φ on the signals of o-methyl groups increases from -0.095, -0.284, -0.345 to -0.377 ppm for Φ = 58°, 77.5°, 85°, and 90°. These values are in good agreement with the theoretical ringcurrent model of Johnson and Bovey.
    Notes: Von 18 methylsubstituierten Biphenylderivaten werden 36 Methylgruppen-NMR-Signale durch multiple lineare Regressionsanalyse auf 4,4′- und 2,2′-Positions-Substituentenkonstanten analysiert. Der Einfluß des Verdrillungswinkels Φ auf die o-Methylgruppensignale steigt von -0.095, -0.284, -0.345 auf -0.37 ppm für Φ = 58°, 77.5°, 85° und 90°. Diese Werte werden am besten durch das theoretische Ringstrommodell von Johnson und Bovey wiedergegeben.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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