¹³C NMR:

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From the molecular formula, the compound has "3 degrees of unsaturation" (3 double bonds or rings).

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The ¹³C NMR has 5 peaks, a quartet at 14 (a CH₃), a triplet at 59 (a CH₂), another triplet at 22 (another CH₂), and two singlets, one at 118 and one at 172. Since the molecule has five carbons and five ¹³C NMR peaks, there must be no symmetry. The singlet at 172 is in the carbonyl region, most likely an acid or an ester. The CH₂ at 59 is in the region where carbons next to electronegative atoms occur (i.e., oxygen) and the CH₃ at 14 is a simple terminal methyl, suggesting an -O-CH₂CH₃ residue. The singlet at 118 would be consistent with a nitrile carbon and the shielded CH₂ at 22 suggests that it may be adjacent to the sp-carbon of the nitrile.

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Structure:

IUPAC Name: ethyl cyanoacetate

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