¹³C NMR of ethyl acetate template

Ethyl acetate ¹³C NMR: C=O δ 171, OCH₂ δ 60, CH₃C=O δ 21, CH₃ δ 14 (CDCl₃ triplet at 77.2), with a ¹³C chemical-shift ranges chart on the same axis.

What the template shows

• Four carbon environments, four singlets (proton-decoupled), on the 220 → 0 ppm scale with the shift-range chart below
• Spectrum (CDCl₃, 100 MHz, typical values) and shift ranges
• δ / ppm (¹³C, proton-decoupled)
• ethyl acetate, C₄H₈O₂
• why there
• ester carbonyl (155–185); quaternary C: small peak
• Typical ¹³C chemical shifts
• Ketone, aldehyde C=O
• Acid, ester, amide C=O
• RCO₂H, RCO₂R′, RCONR₂
• alcohol, ether, ester
• Number of signals = number of carbon environments (4 here). Spectra are normally proton-decoupled, so every carbon is a singlet.
• Peak heights are not proportional to the number of carbons; quaternary C (C=O here) are usually small.
• The ¹³C range is about 0–220 ppm, so signals rarely overlap.
• C=O of acids, esters and amides: 155–185; ketones and aldehydes: 185–220.
• The CDCl₃ solvent gives a 1:1:1 triplet at δ 77.2 (coupling to ²H, spin 1).
• Simulate and compare spectra in the free MolDraw NMR viewer (moldraw.com/tools/nmr-viewer).
• Typical literature values; compare real spectra in SDBS · every part of this figure is editable

Drawn with 6 atoms, 141 shapes – every one editable in MolDraw.

Sources

• Pavia, Lampman, Kriz & Vyvyan, Introduction to Spectroscopy, 5th ed., Cengage 2015, ch. 4 Textbook
• Silverstein, Webster, Kiemle & Bryce, Spectrometric Identification of Organic Compounds, 8th ed., Wiley 2014 Textbook
• SDBS Spectral Database for Organic Compounds (AIST) Database