Proton Magnetic Resonanace Spectra of <I>p</I>-Cresol
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概要
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The proton magnetic resonance spectra of <I>p</I>-cresol in several solutions were measured. The concentration dependence of the resonance in methyl protons suggests no remarkable effect of the hydrogen bonding on methyl protons. The resonance in the hydroxyl proton shows characteristic concentration dependences which are ascribed to the dissociation of the associated molecule in benzene, chloroform and carbon tetrachloride solutions and to the formation of new hydrogen bonds with solvent in acetone, dioxane and pyridine solutions.The ring proton resonance spectrum is a single line in concentrated range whereas it is an A<SUB>2</SUB>B<SUB>2</SUB> type spectrum in dilute range. The splitting of the spectrum in dilute solutions is ascribed to the change in the screening of the proton ortho to the hydroxyl group affected by the change in the intermolecular hydrogen-bonding situation. The shielding of the proton ortho to the methyl group appeared to be unaffected by the same change.
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