Advanced Organic Chemistry: The 13C NMR spectrum of 1-methylethyl methanoate HCOOCH(CH3)2

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Interpreting and explaining the Carbon-13 NMR spectrum of 1-methylethyl methanoate (IUPAC Propan-2-yl methanoate, isopropyl methanoate, isopropyl formate)

[Author © Dr Phil Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 and AP honors chemistry courses: Molecular spectroscopy - analysing the 13C NMR spectra of 1-methylethyl methanoate (isopropyl methanoate) [spectra page updated April 4th 2026 *]

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Introductory note on the 13C NMR spectrum of propan-2-yl methanoate (isopropyl formate)

Students and teachers please note that my explanation of the carbon-13 NMR spectrum of propan-2-yl methanoate (isopropyl formate) is designed for advanced, but pre-university, chemistry courses.

The description does not involve the chemical shift δ spin-spin coupling effects for propan-2-yl methanoate (isopropyl formate) and the relative size of the carbon-13 NMR shifts does not give the ratio of the carbon atoms in the different non-equivalent chemical environments of the propan-2-yl methanoate (isopropyl formate) molecule.

The most common solvent used for investigating the 13C NMR spectrum of compounds like propan-2-yl methanoate (isopropyl formate), is CDCl3 and other deuterated solvents.

13C nmr spectrum of 1-methylethyl methanoate C4H8O2 HCOOCH(CH3)2 analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of isopropyl formate C13 13-C nmr doc brown's advanced organic chemistry revision notes 

TMS is the acronym for tetramethylsilane, formula Si(CH3)4, whose 13C atoms are arbitrarily given a chemical shift of 0.0 ppm. This is the 'standard' in 13C NMR spectroscopy and all other 13C resonances, called chemical shifts, are measured with respect to the TMS, and depend on the individual (electronic) chemical environment of the 13C atoms in an organic molecule - 1-methylethyl methanoate here.

HCOOCH(CH3)2  1-methylethyl methanoate, propan-2-yl methanoate,

is an example of an ester, some old names: isopropyl methanoate, isopropyl formate

The molecular structure and naming of carboxylic acids and derivatives

Interpreting the C-13 NMR spectrum of 1-methylethyl methanoate

As you can see from the diagram above there are 3 different 13C chemical shift lines in the C-13 NMR spectrum of 1-methylethyl methanoate indicating 3 different chemical environments of the 4 carbon atoms of 1-methylethyl methanoate.

HCOOCH(CH3)2

(Note the 3 different colours indicating the 3 different chemical environments of the4 carbon atoms in 1-methylethyl methanoate).

13C chemical shifts (a) to (c) on the C-13 NMR spectrum diagram for 1-methylethyl methanoate.

The methyl group carbon atoms are equivalent to each other due to the symmetry of the 1-methl methanoate molecule.

Note the decreasing effect on the 13C chemical shift as the carbon atom of the alkyl group is further from the more electronegative oxygen atoms in 1-methylethyl methanoate.

The carbon-13 NMR spectra provides direct evidence of 3 different carbon atom environments for the 4 carbon atoms in the 1-methylethyl methanoate molecule, deduced from the presence of 4 different 13C NMR chemical shifts (ppm).

Key words & phrases: C4H8O2 HCOOCH(CH3)2 Interpreting the C-13 NMR spectra of 1-methylethyl methanoate, C-13 nmr spectrum of 1-methylethyl methanoate, understanding the carbon-13 nmr spectrum of 1-methylethyl methanoate, explaining the line pattern in the high resolution C-13 nmr spectra of 1-methylethyl methanoate, revising the C-13 nmr spectrum of 1-methylethyl methanoate, ppm chemical shifts of the C-13 nmr spectrum of 1-methylethyl methanoate, how to construct the diagram of the C-13 nmr spectrum of 1-methylethyl methanoate, how to analyse the chemical shifts in the carbon-13 NMR spectrum of 1-methylethyl methanoate deducing the chemical environment of all the carbon atoms in 1-methylethyl methanoate examining the c13 nmr spectrum of  1-methylethyl methanoate analysing the 13-c nmr spectrum of 1-methylethyl methanoate how do you sketch and interpret the C-13 NMR spectrum of 1-methylethyl methanoate interpreting interpretation of the C-13 NMR spectrum of 1-methylethyl methanoate assignment of chemical shifts in the 13C NMR spectrum of 1-methylethyl methanoate propan-2-yl methanoate isopropyl methanoate, isopropyl formate How do you interpret the chemical shifts of the C-13 NMR spectrum of propan-2-yl methanoate (isopropyl formate) How to interpret the C-13 NMR spectrum of propan-2-yl methanoate (isopropyl formate) Explanatory diagram of the 13C C-13 carbon-13 NMR spectrum of the  number of different carbon atom environments in the propan-2-yl methanoate (isopropyl formate) molecule from its carbon-13 NMR spectrum to help work out the molecular structure of the propan-2-yl methanoate (isopropyl formate) molecule? The uses and distinctive features of the carbon-13 NMR spectrum of the propan-2-yl methanoate (isopropyl formate) molecule explained. What do the number and values of the chemical shifts from the c-13 carbon-13 NMR spectrum tell us about the propan-2-yl methanoate (isopropyl formate) molecule? explaining the decoupled carbon-13 NMR spectrum of propan-2-yl methanoate (isopropyl formate)  with a detailed interpretation diagram of all the C-13 chemical shifts and intensities

Links associated with 1-methylethyl methanoate

The infrared spectrum of 1-methylethyl methanoate, (propan-2-yl methanoate) (isopropyl formate)

The mass spectrum of 1-methylethyl methanoate, (propan-2-yl methanoate) (isopropyl formate)

The H-1 NMR spectrum of 1-methylethyl methanoate, (propan-2-yl methanoate) (isopropyl formate)

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Website content © Dr Phil Brown 2000+. All copyrights reserved on revision notes, images, quizzes, worksheets etc. Copying of Doc Brown's pre-university advanced level chemistry website material is NOT permitted. Exam revision summaries & references to science course specifications are unofficial. These organic chemistry revision notes on spectroscopy (13C NMR spectra of 1-methylethyl methanoate (IUPAC Propan-2-yl methanoate, isopropyl methanoate, isopropyl formate)) are suitable for use of pre-university students studying AQA advanced level chemistry, Edexcel advanced level chemistry, OCR advanced level chemistry, IB advanced level chemistry, WJEC (Eduqas) advanced level chemistry, CIE advanced level chemistry, CCEA advanced level chemistry, US grade 11-12 AP honors chemistry courses and they will also prove useful to 1st year undergraduate students of chemistry.

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