Carbon-13 magnetic resonance: Part I. Chemistry of the tropylium ion Part II. Spectra of xanthone analogs

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1974

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The carbon positional isomerization of the tropylium ion— C[lowered 7]H[lowered 7, raised +] —observed in the mass spectrometer is not observed in solution. Carbon-13 magnetic resonance spectroscopy of carbon-13 vicinally labelled tropilidene after ionization to the tropylium ion and regeneration shows that the carbon positional identity is retained. Carbon-13 magnetic resonance spectra of ten xanthone analogs are presented. The resonance lines of this set of compounds were assigned to the ring carbons by use of aryl additivity parameters aided by lanthanide shift reagent experiments and the paramagnetic relaxation reagent chromium acetonylacetate.

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