Some 9-aryl fluorenes. Ring-current effects on nuclear magnetic resonance spectra, carbonium ions, and the 9-mesitylfluorenyl radical

EA Chandross, CF Sheley Jr

Index: Chandross,E.A.; Sheley,C.F. Journal of the American Chemical Society, 1968 , vol. 90, # 16 p. 4345 - 4354

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Citation Number: 56

Abstract

Abstract: The nmr spectra of various 9-arylfluoren-9-01s and derived carbonium ions are reported. 9-Mesitylfluoren-9-01 exhibits three methyl resonance lines because of the magnetic anisotropy of the fluorene nucleus; similarly 9-durylfluoren-9-01 exhibits four methyl lines. 9-Chloro-9-mesitylfluorene has a temperature-dependent nmr spectrum in which the o-methyl lines are sharp at-10" and broad at 40'while the sharp line of the p- ...