Material Detail

A free tutorial on reading a carbon-13 NMR spectrum in four steps: how many signals there are (symmetry: the three xylenes give 3, 5 and 4 lines), where they fall (shift regions from alkyl carbons to carbonyls), what the peak heights do and do not tell you, and which carbons are CH₃, CH₂, CH or C (DEPT-135 and DEPT-90). It explains the solvent line (the CDCl₃ triplet at 77.16 ppm) and works through ethyl acetate, contrasting it with methyl propanoate.

For upper-division students it covers why heights are unreliable (NOE and T₁ relaxation), quantitative ¹³C (inverse-gated decoupling), diastereotopic carbons and the γ-gauche effect, and points to HSQC and HMBC. An eleven-minute read; no account or software is needed to use it.

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