13C NMR Spectra of tocopherols and 2,2-dimethylchromanols

Carbon-13 NMR signals have been assigned for α-γ- and δ-tocopherols,a nd their model compounds, 2,2-dimethylchromanols. The ¹³C spectra of α-tocopherol-5-CD₃ and ?8-CD₃ afforded the evidence of the assignments of Me-carbon signals. It was found that previous tentative assignments for C-6 and C-8a of α-tocopherol are not correct. Steric compression shifts have been observed at several Me-carbons and at the methylene-carbons of C-4 in their compounds.